# IoTDB Working Process

IoTDB official website:https://iotdb.apache.org/

Code library:https://github.com/apache/iotdb/tree/master

Get started quickly:http://iotdb.apache.org/UserGuide/master/Get%20Started/QuickStart.html

Jira Task Management:https://issues.apache.org/jira/projects/IOTDB/issues

Wiki Document Management:https://cwiki.apache.org/confluence/display/IOTDB/Home\

# Subscribe to mailing list

The mailing list is where the Apache project conducts technical discussions and communication with users. Follow the mailing list to receive mail.

Mailing list address:dev@iotdb.apache.org

Follow method: Send an email to dev-subscribe@iotdb.apache.org with the email you want to receive the email, the subject content is not limited, after receiving the reply, send a confirmation email to the confirmation address again (the confirmation address is longer, it is recommended gmail mailbox).

Other mailing list:

  • notifications@iotdb.apache.org (for JIRA information notification.)
    • If you only want to receive individual Jira notifications that you are interest in, you do not need to subscribe this mailing list. Instead, you just need to click "start-watching this issue" on the jira issue webpage or just comment on this issue.
  • commits@iotdb.apache.org (Any code changes will be notified here, please note that this mailing list will be very large)
  • reviews@iotdb.apache.org (Any code review comments will be notified here, please note that this mailing list will be very large)

# New features, bug feedback, improvements and more

All features or bugs that you want IoTDB to do can be raised on Jira:https://issues.apache.org/jira/projects/IOTDB/issues

You can choose issue types: bug, improvement, new feature, etc. New issues will be automatically synchronized to the mailing list (notifications@), and subsequent discussions can be left on jira or on the mailing list. When the issue is resolved, close the issue.

# Email discussion content (English)

  • Joining the mailing list for the first time can introduce youself briefly. (Hi, I'm xxx ...)

  • Before developing a new feature, you can send an e-mail to declare the task you want to do.(Hi,I'm working on issue IOTDB-XXX,My plan is ...)

# Contributing documents

The content of all IoTDB official websites is in the docs of the project root directory:

  • docs/SystemDesign: System Design Document-English Version
  • docs/zh/SystemDesign: System Design Document-Chinese Version
  • docs/UserGuide: User Guide English Version
  • docs/zh/UserGuide: User Guide Chinese Version
  • docs/Community: community English Version
  • docs/zh/Community: community Chinese Version
  • docs/Development: Development Guide English Version
  • docs/zh/Development: Development Guide Chinese Version

Correspondence between versions and branches on the official website:

  • In progress -> master
  • major_version.x -> rel/major_version (eg 0.9.x -> rel/0.9)

Precautions:

  • Images in Markdown can be uploaded to https://github.com/apache/iotdb-bin-resources for url
  • Do not use special Unicode chars, e.g., U+FF1A
  • Do not use the character of dollar (as we will use Latex to generate pdf files)

# Code Formatting

We use the Spotless plugin (opens new window) together with google-java-format (opens new window) to format our Java code. You can configure your IDE to automatically apply formatting on saving with these steps(Take idea as an example):

  1. Download the google-java-format plugin v1.7.0.5 (opens new window), it can be installed in IDEA (Preferences -> plugins -> search google-java-format), More detailed setup manual (opens new window)
  2. Install the plugin from disk (Plugins -> little gear icon -> "Install plugin from disk" -> Navigate to downloaded zip file)
  3. In the plugin settings, enable the plugin and keep the default Google code style (2-space indents)
  4. Remember to never update this plugin to a later version,until Spotless was upgraded to version 1.8+.
  5. Install the Save Actions plugin (opens new window) , and enable the plugin, along with "Optimize imports" and "Reformat file"
  6. In the "Save Actions" settings page, setup a "File Path Inclusion" for .*\.java. Otherwise you will get unintended reformatting in other files you edit.
  7. Fix the issues of reordering the import packages: in IDEA: choose: Preferences | Editor | Code Style | Java | imports. At the tail of the panel, there is "Import Layout", change it to:
   import org.apache.iotdb.*
   <blank line>
   import all other imports
   <blank line>
   import java.*
   <blank line>
   import static all other imports
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# Contributing code

You can go to jira to pick up the existing issue or create your own issue and get it. The comment says that I can do this issue.

  • Clone the repository to your own local repository, clone to the local, and associate the apache repository as the upstream upstream repository.
  • Cut out a new branch from master. The branch name is determined by the function of this branch. It is usually called f_new_feature (such as f_storage_engine) or fix_bug (such as fix_query_cache_bug).
  • Add code style as the root java-google-style.xml in the idea
  • Modify the code and add test cases (unit test, integration test)
    • Integration test reference:server/src/test/java/org/apache/iotdb/db/integration/IoTDBTimeZoneIT
  • Use mvn spotless:check to check the code style and use mvn spotless:apply to correct the code style
  • Submit a PR, starting with [IOTDB-jira number]
  • Email to dev mailing list:(I've submitted a PR for issue IOTDB-xxx [link])
  • Make changes based on other people's reviews and continue to update until merged
  • close jira issue

# IoTDB Debug Guide

# Import the code

# Intellij idea

It is recommended to use Intellij idea。mvn clean package -DskipTests

Mark antlr/target/generated-sources/antlr4 andthrift/target/generated-sources/thrift as Source Root

# Eclipse

If it is a version before eclipse 2019,users need to be executed in the root directory of IoTDB mvn eclipse:eclipse -DskipTests

import -> General -> Existing Projects into Workspace -> Select IoTDB root directory

If the version after eclipse 2019

import -> Maven -> Existing Maven Projects

# Debugging code

  • Server main function:server/src/main/java/org/apache/iotdb/db/service/IoTDB, can be started in debug mode.

  • Cli:cli/src/main/java/org/apache/iotdb/cli/,Use Cli for linux and WinCli for windows, you can start directly with the parameter "-h 127.0.0.1 -p 6667 -u root -pw root"

  • Server rpc implementation (mainly used for cli and server communication, generally start interruption point here):server/src/main/java/org/apache/iotdb/db/service/TSServiceImpl

  • all jdbc statements:executeStatement(TSExecuteStatementReq req)

  • jdbc query:executeQueryStatement(TSExecuteStatementReq req)

  • native Write interface:insertRecord(TSInsertRecordReq req) insertTablet(TSInsertTabletReq req)

  • Storage engineorg.apache.iotdb.db.engine.StorageEngine

  • Query engine org.apache.iotdb.db.qp.QueryProcessor

# Frequent Questions When Compiling the Source Code

I could not download thrift-* tools, like Could not get content org.apache.maven.wagon.TransferFailedException: Transfer failed for https://github.com/apache/iotdb-bin-resources/blob/main/compile-tools/thrift-0.14-ubuntu

It is due to some network problems (especially in China), you can:

  • Download the file from the URL manually;

    • https://github.com/apache/iotdb-bin-resources/blob/main/compile-tools/thrift-0.14-ubuntu

    • https://github.com/apache/iotdb-bin-resources/blob/main/compile-tools/thrift-0.14-MacOS

  • Put the file to thrift/target/tools/

  • Re-run maven command like mvn compile

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