Common Configuration

IoTDB common files for ConfigNode and DataNode are under conf.

• iotdb-system.properties：IoTDB system configurations.

Effective

Different configuration parameters take effect in the following three ways:

• Only allowed to be modified in first start up: Can't be modified after first start, otherwise the ConfigNode/DataNode cannot start.
• After restarting system: Can be modified after the ConfigNode/DataNode first start, but take effect after restart.
• hot-load: Can be modified while the ConfigNode/DataNode is running, and trigger through sending the command(sql) load configuration or set configuration 'key1' = 'value1' to the IoTDB server by client or session.

Configuration File

Replication Configuration

• config_node_consensus_protocol_class

Name	config_node_consensus_protocol_class
Description	Consensus protocol of ConfigNode replicas, only support RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.ratis.RatisConsensus
Effective	Only allowed to be modified in first start up

• schema_replication_factor

Name	schema_replication_factor
Description	Schema replication num
Type	int32
Default	1
Effective	Take effect on new created Databases after restarting system

• schema_region_consensus_protocol_class

Name	schema_region_consensus_protocol_class
Description	Consensus protocol of schema replicas，larger than 1 replicas could only use RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.ratis.RatisConsensus
Effective	Only allowed to be modified in first start up

• data_replication_factor

Name	data_replication_factor
Description	Data replication num
Type	int32
Default	1
Effective	Take effect on new created Databases after restarting system

• data_region_consensus_protocol_class

Name	data_region_consensus_protocol_class
Description	Consensus protocol of data replicas，larger than 1 replicas could use IoTConsensus or RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.simple.SimpleConsensus
Effective	Only allowed to be modified in first start up

Load balancing Configuration

• series_partition_slot_num

Name	series_slot_num
Description	Slot num of series partition
Type	int32
Default	10000
Effective	Only allowed to be modified in first start up

• series_partition_executor_class

Name	series_partition_executor_class
Description	Series partition hash function
Type	String
Default	org.apache.iotdb.commons.partition.executor.hash.BKDRHashExecutor
Effective	Only allowed to be modified in first start up

• schema_region_group_extension_policy

Name	schema_region_group_extension_policy
Description	The extension policy of SchemaRegionGroup
Type	string
Default	AUTO
Effective	After restarting system

• default_schema_region_group_num_per_database

Name	default_schema_region_group_num_per_database
Description	The number of SchemaRegionGroups that each Database has when using the CUSTOM-SchemaRegionGroup extension policy. The least number of SchemaRegionGroups that each Database has when using the AUTO-SchemaRegionGroup extension policy.
Type	int
Default	1
Effective	After restarting system

• schema_region_per_data_node

Name	schema_region_per_data_node
Description	The maximum number of SchemaRegion expected to be managed by each DataNode
Type	double
Default	1.0
Effective	After restarting system

• data_region_group_extension_policy

Name	data_region_group_extension_policy
Description	The extension policy of DataRegionGroup
Type	string
Default	AUTO
Effective	After restarting system

• default_data_region_group_num_per_database

Name	default_data_region_group_num_per_database
Description	The number of DataRegionGroups that each Database has when using the CUSTOM-DataRegionGroup extension policy. The least number of DataRegionGroups that each Database has when using the AUTO-DataRegionGroup extension policy.
Type	int
Default	1
Effective	After restarting system

• data_region_per_data_node

Name	data_region_per_data_node
Description	The maximum number of DataRegion expected to be managed by each DataNode
Type	double
Default	Half of the CPU cores
Effective	After restarting system

• enable_data_partition_inherit_policy

Name	enable_data_partition_inherit_policy
Description	Whether to enable the DataPartition inherit policy
Type	Boolean
Default	false
Effective	After restarting system

• leader_distribution_policy

Name	leader_distribution_policy
Description	The policy of cluster RegionGroups' leader distribution
Type	String
Default	MIN_COST_FLOW
Effective	After restarting system

• enable_auto_leader_balance_for_ratis

Name	enable_auto_leader_balance_for_ratis_consensus
Description	Whether to enable auto leader balance for Ratis consensus protocol
Type	Boolean
Default	false
Effective	After restarting system

• enable_auto_leader_balance_for_iot_consensus

Name	enable_auto_leader_balance_for_iot_consensus
Description	Whether to enable auto leader balance for IoTConsensus protocol
Type	Boolean
Default	true
Effective	After restarting system

Cluster Management

• cluster_name

Name	cluster_name
Description	The name of cluster
Type	String
Default	default_cluster
Effective	Execute SQL in CLI: set configuration 'cluster_name'='xxx' (xxx is the new cluster name)
Attention	This change is distributed to each node through the network. In the event of network fluctuations or node downtime, it is not guaranteed that the modification will be successful on all nodes. Nodes that fail to modify will not be able to join the cluster upon restart. At this time, it is necessary to manually modify the cluster_name item in the configuration file of the node, and then restart. Under normal circumstances, it is not recommended to change the cluster name by manually modifying the configuration file, nor is it recommended to hot load through the load configuration method.

• time_partition_interval

Name	time_partition_interval
Description	Time partition interval of data when ConfigNode allocate data
Type	Long
Unit	ms
Default	604800000
Effective	Only allowed to be modified in first start up

• heartbeat_interval_in_ms

Name	heartbeat_interval_in_ms
Description	Heartbeat interval in the cluster nodes
Type	Long
Unit	ms
Default	1000
Effective	After restarting system

• disk_space_warning_threshold

Name	disk_space_warning_threshold
Description	Disk remaining threshold
Type	double(percentage)
Default	0.05
Effective	After restarting system

Memory Control Configuration

• datanode_memory_proportion

Name	datanode_memory_proportion
Description	Memory Allocation Ratio: StorageEngine, QueryEngine, SchemaEngine, Consensus, StreamingEngine, and Free Memory
Type	Ratio
Default	3:3:1:1:1:1
Effective	After restarting system

• schema_memory_proportion

Name	schema_memory_proportion
Description	Schema Memory Allocation Ratio: SchemaRegion, SchemaCache, and PartitionCache.
Type	Ratio
Default	5:4:1
Effective	After restarting system

• storage_engine_memory_proportion

Name	storage_engine_memory_proportion
Description	Memory allocation ratio in StorageEngine: Write, Compaction
Type	Ratio
Default	8:2
Effective	After restarting system

• write_memory_proportion

Name	write_memory_proportion
Description	Memory allocation ratio in writing: Memtable, TimePartitionInfo
Type	Ratio
Default	19:1
Effective	After restarting system

• concurrent_writing_time_partition

Name	concurrent_writing_time_partition
Description	This config decides how many time partitions in a database can be inserted concurrently For example, your partitionInterval is 86400 and you want to insert data in 5 different days,
Type	int32
Default	1
Effective	After restarting system

• primitive_array_size

Name	primitive_array_size
Description	primitive array size (length of each array) in array pool
Type	Int32
Default	64
Effective	After restart system

• chunk_metadata_size_proportion

Name	chunk_metadata_size_proportion
Description	size proportion for chunk metadata maintains in memory when writing tsfile
Type	Double
Default	0.1
Effective	After restart system

• flush_proportion

Name	flush_proportion
Description	Ratio of write memory for invoking flush disk, 0.4 by default If you have extremely high write load (like batch=1000), it can be set lower than the default value like 0.2
Type	Double
Default	0.4
Effective	After restart system

• buffered_arrays_memory_proportion

Name	buffered_arrays_memory_proportion
Description	Ratio of write memory allocated for buffered arrays
Type	Double
Default	0.6
Effective	After restart system

• reject_proportion

Name	reject_proportion
Description	Ratio of write memory for rejecting insertion
Type	Double
Default	0.8
Effective	After restart system

• write_memory_variation_report_proportion

Name	write_memory_variation_report_proportion
Description	if memory cost of data region increased more than proportion of allocated memory for write, report to system
Type	Double
Default	0.001
Effective	After restarting system

• check_period_when_insert_blocked

Name	check_period_when_insert_blocked
Description	when an inserting is rejected, waiting period (in ms) to check system again
Type	Int32
Default	50
Effective	After restart system

• io_task_queue_size_for_flushing

Name	io_task_queue_size_for_flushing
Description	size of ioTaskQueue. The default value is 10
Type	Int32
Default	10
Effective	After restart system

• enable_query_memory_estimation

Name	enable_query_memory_estimation
Description	If true, we will estimate each query's possible memory footprint before executing it and deny it if its estimated memory exceeds current free memory
Type	bool
Default	true
Effective	hot-load

• partition_cache_size

Name	partition_cache_size
Description	The max num of partition info record cached on DataNode.
Type	Int32
Default	1000
Effective	After restarting system

Schema Engine Configuration

• schema_engine_mode

Name	schema_engine_mode
Description	Schema engine mode, supporting Memory and PBTree modes; PBTree mode support evict the timeseries schema temporarily not used in memory at runtime, and load it into memory from disk when needed. This parameter must be the same on all DataNodes in one cluster.
Type	string
Default	Memory
Effective	Only allowed to be modified in first start up

• mlog_buffer_size

Name	mlog_buffer_size
Description	size of log buffer in each metadata operation plan(in byte)
Type	int32
Default	1048576
Effective	After restart system

• sync_mlog_period_in_ms

Name	sync_mlog_period_in_ms
Description	The cycle when metadata log is periodically forced to be written to disk(in milliseconds). If force_mlog_period_in_ms = 0 it means force metadata log to be written to disk after each refreshment
Type	Int64
Default	100
Effective	After restarting system

• tag_attribute_flush_interval

Name	tag_attribute_flush_interval
Description	interval num for tag and attribute records when force flushing to disk. When a certain amount of tag and attribute records is reached, they will be force flushed to disk. It is possible to lose at most tag_attribute_flush_interval records
Type	int32
Default	1000
Effective	Only allowed to be modified in first start up

• tag_attribute_total_size

Name	tag_attribute_total_size
Description	The maximum persistence size of tags and attributes of each time series.
Type	int32
Default	700
Effective	Only allowed to be modified in first start up

• schema_region_device_node_cache_size

Name	schema_region_device_node_cache_size
Description	The max num of device node, used for speeding up device query, cached in schemaRegion.
Type	Int32
Default	10000
Effective	After restarting system

• max_measurement_num_of_internal_request

Name	max_measurement_num_of_internal_request
Description	When there's too many measurements in one create timeseries plan, the plan will be split to several sub plan, with measurement num no more than this param.
Type	Int32
Default	10000
Effective	After restarting system

Configurations for creating schema automatically

• enable_auto_create_schema

Name	enable_auto_create_schema
Description	whether auto create the time series when a non-existed time series data comes
Type	true or false
Default	true
Effective	After restarting system

• default_storage_group_level

Name	default_storage_group_level
Description	Database level when creating schema automatically is enabled. For example, if we receives a data point from root.sg0.d1.s2, we will set root.sg0 as the database if database level is 1. (root is level 0)
Type	integer
Default	1
Effective	After restarting system

• boolean_string_infer_type

Name	boolean_string_infer_type
Description	To which type the values "true" and "false" should be reslved
Type	BOOLEAN or TEXT
Default	BOOLEAN
Effective	After restarting system

• integer_string_infer_type

Name	integer_string_infer_type
Description	To which type an integer string like "67" in a query should be resolved
Type	INT32, INT64, DOUBLE, FLOAT or TEXT
Default	DOUBLE
Effective	After restarting system

• floating_string_infer_type

Name	floating_string_infer_type
Description	To which type a floating number string like "6.7" in a query should be resolved
Type	DOUBLE, FLOAT or TEXT
Default	DOUBLE
Effective	After restarting system

• nan_string_infer_type

Name	nan_string_infer_type
Description	To which type the value NaN in a query should be resolved
Type	DOUBLE, FLOAT or TEXT
Default	FLOAT
Effective	After restarting system

Query Configurations

• read_consistency_level

Name	mpp_data_exchange_core_pool_size
Description	The read consistency level, 1. strong(Default, read from the leader replica) 2. weak(Read from a random replica)
Type	string
Default	strong
Effective	After restarting system

• meta_data_cache_enable

Name	meta_data_cache_enable
Description	Whether to cache meta data(BloomFilter, ChunkMetadata and TimeSeriesMetadata) or not.
Type	Boolean
Default	true
Effective	After restarting system

• chunk_timeseriesmeta_free_memory_proportion

Name	chunk_timeseriesmeta_free_memory_proportion
Description	Read memory Allocation Ratio: BloomFilterCache : ChunkCache : TimeSeriesMetadataCache : Coordinator : Operators : DataExchange : timeIndex in TsFileResourceList : others.
Default	1 : 100 : 200 : 300 : 400
Effective	After restarting system

• enable_last_cache

Name	enable_last_cache
Description	Whether to enable LAST cache.
Type	Boolean
Default	true
Effective	After restarting system

• max_deduplicated_path_num

Name	max_deduplicated_path_num
Description	allowed max numbers of deduplicated path in one query.
Type	Int32
Default	1000
Effective	After restarting system

• mpp_data_exchange_core_pool_size

Name	mpp_data_exchange_core_pool_size
Description	Core size of ThreadPool of MPP data exchange
Type	int32
Default	10
Effective	After restarting system

• mpp_data_exchange_max_pool_size

Name	mpp_data_exchange_max_pool_size
Description	Max size of ThreadPool of MPP data exchange
Type	int32
Default	10
Effective	After restarting system

• mpp_data_exchange_keep_alive_time_in_ms

Name	mpp_data_exchange_keep_alive_time_in_ms
Description	Max waiting time for MPP data exchange
Type	long
Default	1000
Effective	After restarting system

• driver_task_execution_time_slice_in_ms

Name	driver_task_execution_time_slice_in_ms
Description	Maximum execution time of a DriverTask
Type	int32
Default	100
Effective	After restarting system

• max_tsblock_size_in_bytes

Name	max_tsblock_size_in_bytes
Description	Maximum capacity of a TsBlock
Type	int32
Default	1024 * 1024 (1 MB)
Effective	After restarting system

• max_tsblock_line_numbers

Name	max_tsblock_line_numbers
Description	Maximum number of lines in a single TsBlock
Type	int32
Default	1000
Effective	After restarting system

• slow_query_threshold

Name	slow_query_threshold
Description	Time cost(ms) threshold for slow query.
Type	Int32
Default	30000
Effective	Trigger

• query_timeout_threshold

Name	query_timeout_threshold
Description	The max executing time of query. unit: ms
Type	Int32
Default	60000
Effective	After restarting system

• max_allowed_concurrent_queries

Name	max_allowed_concurrent_queries
Description	The maximum allowed concurrently executing queries.
Type	Int32
Default	1000
Effective	After restarting system

• query_thread_count

Name	query_thread_count
Description	How many threads can concurrently execute query statement. When <= 0, use CPU core number.
Type	Int32
Default	CPU core number
Effective	After restarting system

• batch_size

Name	batch_size
Description	The amount of data iterate each time in server (the number of data strips, that is, the number of different timestamps.)
Type	Int32
Default	100000
Effective	After restarting system

TTL Configuration

• ttl_check_interval

Name	ttl_check_interval
Description	The interval of TTL check task in each database. Unit: ms. Default is 2 hours.
Type	int
Default	7200000
Effective	After restarting system

• max_expired_time

Name	max_expired_time
Description	If a file contains device that has expired for more than this duration, then the file will be settled immediately. Unit: ms. Default is 1 month.
Type	int
Default	2592000000
Effective	After restarting system

• expired_data_ratio

Name	expired_data_ratio
Description	The expired device ratio. If the ratio of expired devices in one file exceeds this value, then expired data of this file will be cleaned by compaction.
Type	float
Default	0.3
Effective	After restarting system

Storage Engine Configuration

• timestamp_precision

Name	timestamp_precision
Description	timestamp precision，support ms、us、ns
Type	String
Default	ms
Effective	Only allowed to be modified in first start up

• tier_ttl_in_ms

Name	tier_ttl_in_ms
Description	Define the maximum age of data for which each tier is responsible
Type	long
Default	-1
Effective	After restarting system

• max_waiting_time_when_insert_blocked

Name	max_waiting_time_when_insert_blocked
Description	When the waiting time(in ms) of an inserting exceeds this, throw an exception
Type	Int32
Default	10000
Effective	After restarting system

• handle_system_error

Name	handle_system_error
Description	What will the system do when unrecoverable error occurs
Type	String
Default	CHANGE_TO_READ_ONLY
Effective	After restarting system

• write_memory_variation_report_proportion

Name	write_memory_variation_report_proportion
Description	if memory cost of data region increased more than proportion of allocated memory for write, report to system
Type	Double
Default	0.001
Effective	After restarting system

• enable_timed_flush_seq_memtable

Name	enable_timed_flush_seq_memtable
Description	whether to enable timed flush sequence memtable
Type	Boolean
Default	true
Effective	hot-load

• seq_memtable_flush_interval_in_ms

Name	seq_memtable_flush_interval_in_ms
Description	if a memTable's created time is older than current time minus this, the memtable will be flushed to disk
Type	int32
Default	10800000
Effective	hot-load

• seq_memtable_flush_check_interval_in_ms

Name	seq_memtable_flush_check_interval_in_ms
Description	the interval to check whether sequence memtables need flushing
Type	int32
Default	600000
Effective	hot-load

• enable_timed_flush_unseq_memtable

Name	enable_timed_flush_unseq_memtable
Description	whether to enable timed flush unsequence memtable
Type	Boolean
Default	false
Effective	hot-load

• unseq_memtable_flush_interval_in_ms

Name	unseq_memtable_flush_interval_in_ms
Description	if a memTable's created time is older than current time minus this, the memtable will be flushed to disk
Type	int32
Default	600000
Effective	hot-load

• unseq_memtable_flush_check_interval_in_ms

Name	unseq_memtable_flush_check_interval_in_ms
Description	the interval to check whether unsequence memtables need flushing
Type	int32
Default	30000
Effective	hot-load

• tvlist_sort_algorithm

Name	tvlist_sort_algorithm
Description	the sort algorithm used in the memtable's TVList
Type	String
Default	TIM
Effective	After restarting system

• avg_series_point_number_threshold

Name	avg_series_point_number_threshold
Description	max average number of point of each series in memtable
Type	int32
Default	100000
Effective	After restarting system

• flush_thread_count

Name	flush_thread_count
Description	The thread number used to perform the operation when IoTDB writes data in memory to disk. If the value is less than or equal to 0, then the number of CPU cores installed on the machine is used. The default is 0.
Type	int32
Default	0
Effective	After restarting system

• enable_partial_insert

Name	enable_partial_insert
Description	Whether continue to write other measurements if some measurements are failed in one insertion.
Type	Boolean
Default	true
Effective	After restarting system

• recovery_log_interval_in_ms

Name	recovery_log_interval_in_ms
Description	the interval to log recover progress of each region when starting iotdb
Type	Int32
Default	5000
Effective	After restarting system

• 0.13_data_insert_adapt

Name	0.13_data_insert_adapt
Description	if using v0.13 client to insert data, set this configuration to true.
Type	Boolean
Default	false
Effective	After restarting system

• device_path_cache_size

Name	device_path_cache_size
Description	The max size of the device path cache. This cache is for avoiding initialize duplicated device id object in write process
Type	Int32
Default	500000
Effective	After restarting system

• insert_multi_tablet_enable_multithreading_column_threshold

Name	insert_multi_tablet_enable_multithreading_column_threshold
Description	When the insert plan column count reaches the specified threshold, multi-threading is enabled.
Type	int32
Default	10
Effective	After restarting system

Compaction Configurations

• enable_seq_space_compaction

Name	enable_seq_space_compaction
Description	enable the compaction between sequence files
Type	Boolean
Default	true
Effective	hot-load

• enable_unseq_space_compaction

Name	enable_unseq_space_compaction
Description	enable the compaction between unsequence files
Type	Boolean
Default	true
Effective	hot-load

• enable_cross_space_compaction

Name	enable_cross_space_compaction
Description	enable the compaction between sequence files and unsequence files
Type	Boolean
Default	true
Effective	hot-load

• enable_auto_repair_compaction

Name	enable_auto_repair_compaction
Description	enable auto repair unsorted file by compaction
Type	Boolean
Default	true
Effective	hot-load

• cross_selector

Name	cross_selector
Description	the task selector type of cross space compaction
Type	String
Default	rewrite
Effective	After restart system

• cross_performer

Name	cross_performer
Description	the task performer type of cross space compaction. The options are read_point and fast, read_point is the default and fast is still under test
Type	String
Default	read_point
Effective	After restart system

• inner_seq_selector

Name	inner_seq_selector
Description	the task selector type of inner sequence space compaction. Options: size_tiered_single_\target,size_tiered_multi_target
Type	String
Default	hot-load
Effective	hot-load

• inner_seq_performer

Name	inner_seq_peformer
Description	the task performer type of inner sequence space compaction. The options are read_chunk and fast, read_chunk is the default and fast is still under test
Type	String
Default	read_chunk
Effective	After restart system

• inner_unseq_selector

Name	inner_unseq_selector
Description	the task selector type of inner unsequence space compactionn. Options: size_tiered_single_\target,size_tiered_multi_target
Type	String
Default	hot-load
Effective	hot-load

• inner_unseq_performer

Name	inner_unseq_peformer
Description	the task performer type of inner unsequence space compaction. The options are read_point and fast, read_point is the default and fast is still under test
Type	String
Default	read_point
Effective	After restart system

• compaction_priority

Name	compaction_priority
Description	Priority of compaction task. When it is BALANCE, system executes all types of compaction equally; when it is INNER_CROSS, system takes precedence over executing inner space compaction task; when it is CROSS_INNER, system takes precedence over executing cross space compaction task
Type	String
Default	INNER_CROSS
Effective	After restart system

• target_compaction_file_size

Name	target_compaction_file_size
Description	The target file size in compaction
Type	Int64
Default	2147483648
Effective	After restart system

• target_chunk_size

Name	target_chunk_size
Description	The target size of compacted chunk
Type	Int64
Default	1048576
Effective	After restart system

• target_chunk_point_num

Name	target_chunk_point_num
Description	The target point number of compacted chunk
Type	int32
Default	100000
Effective	After restart system

• chunk_size_lower_bound_in_compaction

Name	chunk_size_lower_bound_in_compaction
Description	A source chunk will be deserialized in compaction when its size is less than this value
Type	Int64
Default	10240
Effective	After restart system

• chunk_point_num_lower_bound_in_compaction

Name	chunk_point_num_lower_bound_in_compaction
Description	A source chunk will be deserialized in compaction when its point num is less than this value
Type	int32
Default	1000
Effective	After restart system

• inner_compaction_total_file_num_threshold

Name	inner_compaction_total_file_num_threshold
Description	The max num of files encounter in inner space compaction
Type	int32
Default	100
Effective	hot-load

• inner_compaction_total_file_size_threshold

Name	inner_compaction_total_file_size_threshold
Description	The total file size limit in inner space compaction. Unit: byte
Type	int64
Default	10737418240
Effective	hot-load

• compaction_max_aligned_series_num_in_one_batch

Name	compaction_max_aligned_series_num_in_one_batch
Description	How many value chunk will be compacted in aligned series compaction
Type	int32
Default	10
Effective	hot-load

• max_level_gap_in_inner_compaction

Name	max_level_gap_in_inner_compaction
Description	The max level gap in inner compaction selection
Type	int32
Default	2
Effective	hot-load

• inner_compaction_candidate_file_num

Name	inner_compaction_candidate_file_num
Description	The file num requirement when selecting inner space compaction candidate files
Type	int32
Default	30
Effective	hot-load

• max_cross_compaction_file_num

Name	max_cross_compaction_candidate_file_num
Description	The max num of files encounter in cross space compaction
Type	int32
Default	500
Effective	hot-load

• max_cross_compaction_file_size

Name	max_cross_compaction_candidate_file_size
Description	The max size of files encounter in cross space compaction
Type	Int64
Default	5368709120
Effective	hot-load

• compaction_thread_count

Name	compaction_thread_count
Description	thread num to execute compaction
Type	int32
Default	10
Effective	hot-load

• compaction_schedule_interval_in_ms

Name	compaction_schedule_interval_in_ms
Description	interval of scheduling compaction
Type	Int64
Default	60000
Effective	After restart system

• compaction_submission_interval_in_ms

Name	compaction_submission_interval_in_ms
Description	interval of submitting compaction task
Type	Int64
Default	60000
Effective	After restart system

• compaction_write_throughput_mb_per_sec

Name	compaction_write_throughput_mb_per_sec
Description	The write rate of all compaction tasks in MB/s, values less than or equal to 0 means no limit
Type	int32
Default	16
Effective	hot-load

• compaction_read_throughput_mb_per_sec

Name	compaction_read_throughput_mb_per_sec
Description	The read rate of all compaction tasks in MB/s, values less than or equal to 0 means no limit
Type	int32
Default	0
Effective	hot-load

• compaction_read_operation_per_sec

Name	compaction_read_operation_per_sec
Description	The read operation of all compaction tasks can reach per second, values less than or equal to 0 means no limit
Type	int32
Default	0
Effective	hot-load

• sub_compaction_thread_count

Name	sub_compaction_thread_count
Description	the number of sub-compaction threads to accelerate cross space compaction
Type	Int32
Default	4
Effective	hot-load

• enable_tsfile_validation

Name	enable_tsfile_validation
Description	Verify that TSfiles generated by Flush, Load, and Compaction are correct.
Type	boolean
Default	false
Effective	hot-load

• candidate_compaction_task_queue_size

Name	candidate_compaction_task_queue_size
Description	The size of candidate compaction task queue
Type	Int32
Default	50
Effective	After restart system

• compaction_schedule_thread_num

Name	compaction_schedule_thread_num
Description	The number of threads to be set up to select compaction task.
Type	Int32
Default	4
Effective	hot-load

Write Ahead Log Configuration

• wal_mode

Name	wal_mode
Description	The write mode of wal. For DISABLE mode, the system will disable wal. For SYNC mode, the system will submit wal synchronously, write request will not return until its wal is fsynced to the disk successfully. For ASYNC mode, the system will submit wal asynchronously, write request will return immediately no matter its wal is fsynced to the disk successfully.
Type	String
Default	ASYNC
Effective	After restart system

• max_wal_nodes_num

Name	max_wal_nodes_num
Description	Max number of wal nodes, each node corresponds to one wal directory. The default value 0 means the number is determined by the system.
Type	int32
Default	0
Effective	After restart system

• wal_async_mode_fsync_delay_in_ms

Name	wal_async_mode_fsync_delay_in_ms
Description	Duration a wal flush operation will wait before calling fsync in the async mode
Type	int32
Default	1000
Effective	hot-load

• wal_sync_mode_fsync_delay_in_ms

Name	wal_sync_mode_fsync_delay_in_ms
Description	Duration a wal flush operation will wait before calling fsync in the sync mode
Type	int32
Default	3
Effective	hot-load

• wal_buffer_size_in_byte

Name	wal_buffer_size_in_byte
Description	Buffer size of each wal node
Type	int32
Default	33554432
Effective	After restart system

• wal_buffer_queue_capacity

Name	wal_buffer_queue_capacity
Description	Blocking queue capacity of each wal buffer
Type	int32
Default	500
Effective	After restart system

• wal_file_size_threshold_in_byte

Name	wal_file_size_threshold_in_byte
Description	Size threshold of each wal file
Type	int32
Default	31457280
Effective	hot-load

• wal_min_effective_info_ratio

Name	wal_min_effective_info_ratio
Description	Minimum ratio of effective information in wal files
Type	double
Default	0.1
Effective	hot-load

• wal_memtable_snapshot_threshold_in_byte

Name	wal_memtable_snapshot_threshold_in_byte
Description	MemTable size threshold for triggering MemTable snapshot in wal
Type	int64
Default	8388608
Effective	hot-load

• max_wal_memtable_snapshot_num

Name	max_wal_memtable_snapshot_num
Description	MemTable's max snapshot number in wal
Type	int32
Default	1
Effective	hot-load

• delete_wal_files_period_in_ms

Name	delete_wal_files_period_in_ms
Description	The period when outdated wal files are periodically deleted
Type	int64
Default	20000
Effective	hot-load

TsFile Configurations

• group_size_in_byte

Name	group_size_in_byte
Description	The data size written to the disk per time
Type	int32
Default	134217728
Effective	hot-load

• page_size_in_byte

Name	page_size_in_byte
Description	The maximum size of a single page written in memory when each column in memory is written (in bytes)
Type	int32
Default	65536
Effective	hot-load

• max_number_of_points_in_page

Name	max_number_of_points_in_page
Description	The maximum number of data points (timestamps - valued groups) contained in a page
Type	int32
Default	10000
Effective	hot-load

• pattern_matching_threshold

Name	pattern_matching_threshold
Description	Max matching time of regex pattern
Type	int32
Default	1000000
Effective	hot-load

• max_degree_of_index_node

Name	max_degree_of_index_node
Description	The maximum degree of the metadata index tree (that is, the max number of each node's children)
Type	int32
Default	256
Effective	Only allowed to be modified in first start up

• max_string_length

Name	max_string_length
Description	The maximum length of a single string (number of character)
Type	int32
Default	128
Effective	hot-load

• value_encoder

Name	value_encoder
Description	Encoding type of value column
Type	Enum String: “TS_2DIFF”,“PLAIN”,“RLE”
Default	PLAIN
Effective	hot-load

• float_precision

Name	float_precision
Description	The precision of the floating point number.(The number of digits after the decimal point)
Type	int32
Default	The default is 2 digits. Note: The 32-bit floating point number has a decimal precision of 7 bits, and the 64-bit floating point number has a decimal precision of 15 bits. If the setting is out of the range, it will have no practical significance.
Effective	hot-load

• compressor

Name	compressor
Description	Data compression method; Time compression method in aligned timeseries
Type	Enum String : "UNCOMPRESSED", "SNAPPY", "LZ4", "ZSTD", "LZMA2"
Default	SNAPPY
Effective	hot-load

• bloomFilterErrorRate

Name	bloomFilterErrorRate
Description	The false positive rate of bloom filter in each TsFile. Bloom filter checks whether a given time series is in the tsfile before loading metadata. This can improve the performance of loading metadata and skip the tsfile that doesn't contain specified time series. If you want to learn more about its mechanism, you can refer to: wiki page of bloom filter.
Type	float, (0, 1)
Default	0.05
Effective	After restarting system

Authorization Configuration

• authorizer_provider_class

Name	authorizer_provider_class
Description	the class name of the authorization service
Type	String
Default	org.apache.iotdb.commons.auth.authorizer.LocalFileAuthorizer
Effective	After restarting system
Other available values	org.apache.iotdb.commons.auth.authorizer.OpenIdAuthorizer

• openID_url

Name	openID_url
Description	the openID server if OpenIdAuthorizer is enabled
Type	String (a http url)
Default	no
Effective	After restarting system

• iotdb_server_encrypt_decrypt_provider

Name	iotdb_server_encrypt_decrypt_provider
Description	The Class for user password encryption
Type	String
Default	org.apache.iotdb.commons.security.encrypt.MessageDigestEncrypt
Effective	Only allowed to be modified in first start up

• iotdb_server_encrypt_decrypt_provider_parameter

Name	iotdb_server_encrypt_decrypt_provider_parameter
Description	Parameters used to initialize the user password encryption class
Type	String
Default	空
Effective	After restarting system

• author_cache_size

Name	author_cache_size
Description	Cache size of user and role
Type	int32
Default	1000
Effective	After restarting system

• author_cache_expire_time

Name	author_cache_expire_time
Description	Cache expire time of user and role, Unit: minutes
Type	int32
Default	30
Effective	After restarting system

UDF Configuration

• udf_initial_byte_array_length_for_memory_control

Name	udf_initial_byte_array_length_for_memory_control
Description	Used to estimate the memory usage of text fields in a UDF query. It is recommended to set this value to be slightly larger than the average length of all texts.
Type	int32
Default	48
Effective	After restarting system

• udf_memory_budget_in_mb

Name	udf_memory_budget_in_mb
Description	How much memory may be used in ONE UDF query (in MB). The upper limit is 20% of allocated memory for read.
Type	Float
Default	30.0
Effective	After restarting system

• udf_reader_transformer_collector_memory_proportion

Name	udf_reader_transformer_collector_memory_proportion
Description	UDF memory allocation ratio for reader, transformer and collector. The parameter form is a : b : c, where a, b, and c are integers.
Type	String
Default	1:1:1
Effective	After restarting system

• udf_root_dir

Name	udf_root_dir
Description	Root directory of UDF
Type	String
Default	ext/udf(Windows:ext\udf)
Effective	After restarting system

• udf_lib_dir

Name	udf_lib_dir
Description	UDF log and jar file dir
Type	String
Default	ext/udf（Windows：ext\udf）
Effective	After restarting system

Trigger Configuration

• trigger_lib_dir

Name	trigger_lib_dir
Description	Trigger JAR file dir
Type	String
Default	ext/trigger
Effective	After restarting system

• stateful_trigger_retry_num_when_not_found

Name	stateful_trigger_retry_num_when_not_found
Description	How many times we will retry to found an instance of stateful trigger on DataNodes
Type	Int32
Default	3
Effective	After restarting system

SELECT-INTO

• into_operation_buffer_size_in_byte

Name	into_operation_buffer_size_in_byte
Description	When the select-into statement is executed, the maximum memory occupied by the data to be written (unit: Byte)
Type	int64
Default	100MB
Effective	hot-load

• select_into_insert_tablet_plan_row_limit

Name	select_into_insert_tablet_plan_row_limit
Description	The maximum number of rows that can be processed in insert-tablet-plan when executing select-into statements. When <= 0, use 10000.
Type	int32
Default	10000
Effective	hot-load

• into_operation_execution_thread_count

Name	into_operation_execution_thread_count
Description	The number of threads in the thread pool that execute insert-tablet tasks
Type	int32
Default	2
Effective	After restarting system

Continuous Query

• continuous_query_execution_thread

Name	continuous_query_execution_thread
Description	How many threads will be set up to perform continuous queries
Type	int32
Default	max(1, the / 2)
Effective	After restarting system

• continuous_query_min_every_interval

Name	continuous_query_min_every_interval
Description	Minimum every interval to perform continuous query.
Type	duration
Default	1s
Effective	After restarting system

PIPE Configuration

• pipe_lib_dir

Name	pipe_lib_dir
Description	Directory for storing custom Pipe plugins
Type	string
Default Value	ext/pipe
Effective	Not currently supported for modification

• pipe_subtask_executor_max_thread_num

Name	pipe_subtask_executor_max_thread_num
Description	The maximum number of threads that can be used for processors and sinks in Pipe subtasks. The actual value will be the minimum of pipe_subtask_executor_max_thread_num and the maximum of 1 and half of the CPU core count.
Type	int
Default Value	5
Effective	After restarting system

• pipe_sink_timeout_ms

Name	pipe_sink_timeout_ms
Description	The connection timeout for Thrift clients in milliseconds.
Type	int
Default Value	900000
Effective	After restarting system

• pipe_sink_selector_number

Name	pipe_sink_selector_number
Description	The maximum number of threads for processing execution results in the iotdb-thrift-async-sink plugin. It is recommended to set this value to be less than or equal to pipe_sink_max_client_number.
Type	int
Default Value	4
Effective	After restarting system

• pipe_sink_max_client_number

Name	pipe_sink_max_client_number
Description	The maximum number of clients that can be used in the iotdb-thrift-async-sink plugin.
Type	int
Default Value	16
Effective	After restarting system

• pipe_air_gap_receiver_enabled

Name	pipe_air_gap_receiver_enabled
Description	Whether to enable receiving Pipe data through a gateway. The receiver can only return 0 or 1 in TCP mode to indicate whether the data was successfully received.
Type	Boolean
Default Value	false
Effective	After restarting system

• pipe_air_gap_receiver_port

Name	pipe_air_gap_receiver_port
Description	The port used by the server to receive Pipe data through a gateway.
Type	int
Default Value	9780
Effective	After restarting system

• pipe_all_sinks_rate_limit_bytes_per_second

Name	pipe_all_sinks_rate_limit_bytes_per_second
Description	The total number of bytes per second that all Pipe sinks can transmit. When the given value is less than or equal to 0, it indicates there is no limit. The default value is -1, which means there is no limit.
Type	double
Default Value	-1
Effective	Can be hot-loaded

IOTConsensus Configuration

• data_region_iot_max_log_entries_num_per_batch

Name	data_region_iot_max_log_entries_num_per_batch
Description	The maximum log entries num in IoTConsensus Batch
Type	int32
Default	1024
Effective	After restarting system

• data_region_iot_max_size_per_batch

Name	data_region_iot_max_size_per_batch
Description	The maximum size in IoTConsensus Batch
Type	int32
Default	16MB
Effective	After restarting system

• data_region_iot_max_pending_batches_num

Name	data_region_iot_max_pending_batches_num
Description	The maximum pending batches num in IoTConsensus
Type	int32
Default	12
Effective	After restarting system

• data_region_iot_max_memory_ratio_for_queue

Name	data_region_iot_max_memory_ratio_for_queue
Description	The maximum memory ratio for queue in IoTConsensus
Type	double
Default	0.6
Effective	After restarting system

RatisConsensus Configuration

• config_node_ratis_log_appender_buffer_size_max

Name	config_node_ratis_log_appender_buffer_size_max
Description	confignode max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

• schema_region_ratis_log_appender_buffer_size_max

Name	schema_region_ratis_log_appender_buffer_size_max
Description	schema region max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

• data_region_ratis_log_appender_buffer_size_max

Name	data_region_ratis_log_appender_buffer_size_max
Description	data region max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

• config_node_ratis_snapshot_trigger_threshold

Name	config_node_ratis_snapshot_trigger_threshold
Description	confignode trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

• schema_region_ratis_snapshot_trigger_threshold

Name	schema_region_ratis_snapshot_trigger_threshold
Description	schema region trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

• data_region_ratis_snapshot_trigger_threshold

Name	data_region_ratis_snapshot_trigger_threshold
Description	data region trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

• config_node_ratis_log_unsafe_flush_enable

Name	config_node_ratis_log_unsafe_flush_enable
Description	confignode allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

• schema_region_ratis_log_unsafe_flush_enable

Name	schema_region_ratis_log_unsafe_flush_enable
Description	schema region allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

• data_region_ratis_log_unsafe_flush_enable

Name	data_region_ratis_log_unsafe_flush_enable
Description	data region allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

• config_node_ratis_log_segment_size_max_in_byte

Name	config_node_ratis_log_segment_size_max_in_byte
Description	confignode max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

• schema_region_ratis_log_segment_size_max_in_byte

Name	schema_region_ratis_log_segment_size_max_in_byte
Description	schema region max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

• data_region_ratis_log_segment_size_max_in_byte

Name	data_region_ratis_log_segment_size_max_in_byte
Description	data region max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

• config_node_ratis_grpc_flow_control_window

Name	config_node_ratis_grpc_flow_control_window
Description	confignode flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

• schema_region_ratis_grpc_flow_control_window

Name	schema_region_ratis_grpc_flow_control_window
Description	schema region flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

• data_region_ratis_grpc_flow_control_window

Name	data_region_ratis_grpc_flow_control_window
Description	data region flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

• config_node_ratis_grpc_leader_outstanding_appends_max

Name	config_node_ratis_grpc_leader_outstanding_appends_max
Description	config node grpc pipeline concurrency threshold
Type	int32
Default	128
Effective	After restarting system

• schema_region_ratis_grpc_leader_outstanding_appends_max

Name	schema_region_ratis_grpc_leader_outstanding_appends_max
Description	schema region grpc pipeline concurrency threshold
Type	int32
Default	128
Effective	After restarting system

• data_region_ratis_grpc_leader_outstanding_appends_max

Name	data_region_ratis_grpc_leader_outstanding_appends_max
Description	data region grpc pipeline concurrency threshold
Type	int32
Default	128
Effective	After restarting system

• config_node_ratis_log_force_sync_num

Name	config_node_ratis_log_force_sync_num
Description	config node fsync threshold
Type	int32
Default	128
Effective	After restarting system

• schema_region_ratis_log_force_sync_num

Name	schema_region_ratis_log_force_sync_num
Description	schema region fsync threshold
Type	int32
Default	128
Effective	After restarting system

• data_region_ratis_log_force_sync_num

Name	data_region_ratis_log_force_sync_num
Description	data region fsync threshold
Type	int32
Default	128
Effective	After restarting system

• config_node_ratis_rpc_leader_election_timeout_min_ms

Name	config_node_ratis_rpc_leader_election_timeout_min_ms
Description	confignode min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• schema_region_ratis_rpc_leader_election_timeout_min_ms

Name	schema_region_ratis_rpc_leader_election_timeout_min_ms
Description	schema region min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• data_region_ratis_rpc_leader_election_timeout_min_ms

Name	data_region_ratis_rpc_leader_election_timeout_min_ms
Description	data region min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• config_node_ratis_rpc_leader_election_timeout_max_ms

Name	config_node_ratis_rpc_leader_election_timeout_max_ms
Description	confignode max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• schema_region_ratis_rpc_leader_election_timeout_max_ms

Name	schema_region_ratis_rpc_leader_election_timeout_max_ms
Description	schema region max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• data_region_ratis_rpc_leader_election_timeout_max_ms

Name	data_region_ratis_rpc_leader_election_timeout_max_ms
Description	data region max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

• config_node_ratis_request_timeout_ms

Name	config_node_ratis_request_timeout_ms
Description	confignode ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

• schema_region_ratis_request_timeout_ms

Name	schema_region_ratis_request_timeout_ms
Description	schema region ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

• data_region_ratis_request_timeout_ms

Name	data_region_ratis_request_timeout_ms
Description	data region ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

• config_node_ratis_max_retry_attempts

Name	config_node_ratis_max_retry_attempts
Description	confignode ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

• config_node_ratis_initial_sleep_time_ms

Name	config_node_ratis_initial_sleep_time_ms
Description	confignode ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

• config_node_ratis_max_sleep_time_ms

Name	config_node_ratis_max_sleep_time_ms
Description	confignode ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

• schema_region_ratis_max_retry_attempts

Name	schema_region_ratis_max_retry_attempts
Description	schema region ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

• schema_region_ratis_initial_sleep_time_ms

Name	schema_region_ratis_initial_sleep_time_ms
Description	schema region ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

• schema_region_ratis_max_sleep_time_ms

Name	schema_region_ratis_max_sleep_time_ms
Description	schema region ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

• data_region_ratis_max_retry_attempts

Name	data_region_ratis_max_retry_attempts
Description	data region ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

• data_region_ratis_initial_sleep_time_ms

Name	data_region_ratis_initial_sleep_time_ms
Description	data region ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

• data_region_ratis_max_sleep_time_ms

Name	data_region_ratis_max_sleep_time_ms
Description	data region ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

• ratis_first_election_timeout_min_ms

Name	ratis_first_election_timeout_min_ms
Description	minimal first election timeout for RatisConsensus
Type	int64
Default	50 (ms)
Effective	After restarting system

• ratis_first_election_timeout_max_ms

Name	ratis_first_election_timeout_max_ms
Description	maximal first election timeout for RatisConsensus
Type	int64
Default	150 (ms)
Effective	After restarting system

• config_node_ratis_preserve_logs_num_when_purge

Name	config_node_ratis_preserve_logs_num_when_purge
Description	confignode preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

• schema_region_ratis_preserve_logs_num_when_purge

Name	schema_region_ratis_preserve_logs_num_when_purge
Description	schema region preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

• data_region_ratis_preserve_logs_num_when_purge

Name	data_region_ratis_preserve_logs_num_when_purge
Description	data region preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

• config_node_ratis_log_max_size

Name	config_node_ratis_log_max_size
Description	Max file size of in-disk Raft Log for config node
Type	int64
Default	2147483648 (2GB)
Effective	After restarting system

• schema_region_ratis_log_max_size

Name	schema_region_ratis_log_max_size
Description	Max file size of in-disk Raft Log for schema region
Type	int64
Default	2147483648 (2GB)
Effective	After restarting system

• data_region_ratis_log_max_size

Name	data_region_ratis_log_max_size
Description	Max file size of in-disk Raft Log for data region
Type	int64
Default	21474836480 (20GB)
Effective	After restarting system

• config_node_ratis_periodic_snapshot_interval

Name	config_node_ratis_periodic_snapshot_interval
Description	duration interval of config-node periodic snapshot
Type	int64
Default	86400 (seconds)
Effective	After restarting system

• schema_region_ratis_periodic_snapshot_interval

Name	schema_region_ratis_preserve_logs_num_when_purge
Description	duration interval of schema-region periodic snapshot
Type	int64
Default	86400 (seconds)
Effective	After restarting system

• data_region_ratis_periodic_snapshot_interval

Name	data_region_ratis_preserve_logs_num_when_purge
Description	duration interval of data-region periodic snapshot
Type	int64
Default	86400 (seconds)
Effective	After restarting system

Procedure Configuration

• procedure_core_worker_thread_count

Name	procedure_core_worker_thread_count
Description	The number of worker thread count
Type	int32
Default	4
Effective	After restarting system

• procedure_completed_clean_interval

Name	procedure_completed_clean_interval
Description	Time interval of completed procedure cleaner work in
Type	int32
Unit	second
Default	30
Effective	After restarting system

• procedure_completed_evict_ttl

Name	procedure_completed_evict_ttl
Description	The ttl of completed procedure
Type	int32
Unit	second
Default	800
Effective	After restarting system

MQTT Broker Configuration

• enable_mqtt_service

Name	enable_mqtt_service。
Description	Whether to enable the MQTT service
Type	Boolean
Default	False
Effective	hot-load

• mqtt_host

Name	mqtt_host
Description	The host to which the MQTT service is bound
Type	String
Default	0.0.0.0
Effective	hot-load

• mqtt_port

Name	mqtt_port
Description	The port to which the MQTT service is bound
Type	int32
Default	1883
Effective	hot-load

• mqtt_handler_pool_size

Name	mqtt_handler_pool_size
Description	The size of the handler pool used to process MQTT messages
Type	int32
Default	1
Effective	hot-load

• mqtt_payload_formatter

Name	mqtt_payload_formatter
Description	MQTT message payload formatter
Type	String
Default	JSON
Effective	hot-load

• mqtt_max_message_size

Name	mqtt_max_message_size
Description	Maximum length of MQTT message in bytes
Type	int32
Default	1048576
Effective	hot-load

TsFile Active Listening&Loading Function Configuration

• load_active_listening_enable

Name	load_active_listening_enable
Description	Whether to enable the DataNode's active listening and loading of tsfile functionality (default is enabled).
Type	Boolean
Default	true
Effective	hot-load

• load_active_listening_dirs

Name	load_active_listening_dirs
Description	The directories to be listened to (automatically includes subdirectories of the directory), if there are multiple, separate with “,”. The default directory is ext/load/pending (supports hot loading).
Type	String
Default	ext/load/pending
Effective	hot-load

• load_active_listening_fail_dir

Name	load_active_listening_fail_dir
Description	The directory to which files are transferred after the execution of loading tsfile files fails, only one directory can be configured.
Type	String
Default	ext/load/failed
Effective	hot-load

• load_active_listening_max_thread_num

Name	load_active_listening_max_thread_num
Description	The maximum number of threads to perform loading tsfile tasks simultaneously. The default value when the parameter is commented out is max(1, CPU core count / 2). When the user sets a value not in the range [1, CPU core count / 2], it will be set to the default value (1, CPU core count / 2).
Type	Long
Default	max(1, CPU core count / 2)
Effective	Effective after restart

• load_active_listening_check_interval_seconds

Name	load_active_listening_check_interval_seconds
Description	Active listening polling interval in seconds. The function of actively listening to tsfile is achieved by polling the folder. This configuration specifies the time interval between two checks of load_active_listening_dirs, and the next check will be executed after load_active_listening_check_interval_seconds seconds of each check. When the user sets the polling interval to less than 1, it will be set to the default value of 5 seconds.
Type	Long
Default	5
Effective	Effective after restart