pull-deps tool

pull-deps is an Apache Druid tool that can pull down dependencies to the local repository and lay dependencies out into the extension directory as needed.

pull-deps has several command line options, they are as follows:

-c or --coordinate (Can be specified multiple times)

Extension coordinate to pull down, followed by a maven coordinate, e.g. org.apache.druid.extensions:mysql-metadata-storage

-h or --hadoop-coordinate (Can be specified multiply times)

Apache Hadoop dependency to pull down, followed by a maven coordinate, e.g. org.apache.hadoop:hadoop-client:2.4.0

--no-default-hadoop

Don't pull down the default hadoop coordinate, i.e., org.apache.hadoop:hadoop-client:2.3.0. If -h option is supplied, then default hadoop coordinate will not be downloaded.

--clean

Remove existing extension and hadoop dependencies directories before pulling down dependencies.

-l or --localRepository

A local repository that Maven will use to put downloaded files. Then pull-deps will lay these files out into the extensions directory as needed.

-r or --remoteRepository

Add a remote repository. Unless --no-default-remote-repositories is provided, these will be used after https://repo1.maven.org/maven2/ and http://metamx.artifactoryonline.com/metamx/pub-libs-releases-local

--no-default-remote-repositories

Don't use the default remote repositories, only use the repositories provided directly via --remoteRepository.

-d or --defaultVersion

Version to use for extension coordinate that doesn't have a version information. For example, if extension coordinate is org.apache.druid.extensions:mysql-metadata-storage, and default version is 2021.07.0-iap, then this coordinate will be treated as org.apache.druid.extensions:mysql-metadata-storage:2021.07.0-iap

--use-proxy

Use http/https proxy to send request to the remote repository servers. --proxy-host and --proxy-port must be set explicitly if this option is enabled.

--proxy-type

Set the proxy type, Should be either http or https, default value is https.

--proxy-host

Set the proxy host. e.g. proxy.com.

--proxy-port

Set the proxy port number. e.g. 8080.

--proxy-username

Set a username to connect to the proxy, this option is only required if the proxy server uses authentication.

--proxy-password

Set a password to connect to the proxy, this option is only required if the proxy server uses authentication.

To run pull-deps, you should

1. Specify druid.extensions.directory and druid.extensions.hadoopDependenciesDir, these two properties tell pull-deps where to put extensions. If you don't specify them, default values will be used, see Configuration.

2. Tell pull-deps what to download using -c or -h option, which are followed by a maven coordinate.

Example:

Suppose you want to download mysql-metadata-storage and hadoop-client(both 2.3.0 and 2.4.0) with a specific version, you can run pull-deps command with -c org.apache.druid.extensions:mysql-metadata-storage:2021.07.0-iap, -h org.apache.hadoop:hadoop-client:2.3.0 and -h org.apache.hadoop:hadoop-client:2.4.0, an example command would be:

java -classpath "/my/druid/lib/*" org.apache.druid.cli.Main tools pull-deps --clean -c org.apache.druid.extensions:mysql-metadata-storage:2021.07.0-iap -h org.apache.hadoop:hadoop-client:2.3.0 -h org.apache.hadoop:hadoop-client:2.4.0

Because --clean is supplied, this command will first remove the directories specified at druid.extensions.directory and druid.extensions.hadoopDependenciesDir, then recreate them and start downloading the extensions there. After finishing downloading, if you go to the extension directories you specified, you will see

tree extensions
extensions
└── mysql-metadata-storage
    └── mysql-metadata-storage-2021.07.0-iap.jar

tree hadoop-dependencies
hadoop-dependencies/
└── hadoop-client
    ├── 2.3.0
    │   ├── activation-1.1.jar
    │   ├── avro-1.7.4.jar
    │   ├── commons-beanutils-1.7.0.jar
    │   ├── commons-beanutils-core-1.8.0.jar
    │   ├── commons-cli-1.2.jar
    │   ├── commons-codec-1.4.jar
    ..... lots of jars
    └── 2.4.0
        ├── activation-1.1.jar
        ├── avro-1.7.4.jar
        ├── commons-beanutils-1.7.0.jar
        ├── commons-beanutils-core-1.8.0.jar
        ├── commons-cli-1.2.jar
        ├── commons-codec-1.4.jar
    ..... lots of jars

Note that if you specify --defaultVersion, you don't have to put version information in the coordinate. For example, if you want mysql-metadata-storage to use version 2021.07.0-iap, you can change the command above to

java -classpath "/my/druid/lib/*" org.apache.druid.cli.Main tools pull-deps --defaultVersion 2021.07.0-iap --clean -c org.apache.druid.extensions:mysql-metadata-storage -h org.apache.hadoop:hadoop-client:2.3.0 -h org.apache.hadoop:hadoop-client:2.4.0

Please note to use the pull-deps tool you must know the Maven groupId, artifactId, and version of your extension.

For Druid community extensions listed here, the groupId is "org.apache.druid.extensions.contrib" and the artifactId is the name of the extension.