[jira] [Commented] (FLINK-10341) Add option to print flink command when running bin/flink

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16613495#comment-16613495 ] 

ASF GitHub Bot commented on FLINK-10341:
----------------------------------------

zjffdu opened a new pull request #6690: [FLINK-10341][shell script] Add option to print flink command when running bin/flink
URL: https://github.com/apache/flink/pull/6690
 
 
   ## What is the purpose of the change
   
   The purpose is to print the final java command when running `bin/flink`, this would be useful for developer to debug the flink program especially when hitting weird launch issue such classpath issue.  
   
   ## Brief change log
   
   Just introduce env variable `PRINT_FLINK_COMMAND`, when it is set, user can see the final java command.
   
   ## Verifying this change
   
   User can print flink command via setting env PRINT_FLINK_COMMAND.
   
   e.g. 
   ```
   export PRINT_FLINK_COMMAND=1 
   bin/flink run -h
   ```
   
   Here's the output
   ```
   FLINK_COMMAND:/Library/Java/JavaVirtualMachines/jdk1.8.0_172.jdk/Contents/Home/bin/java  -Dlog.file=/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/log/flink-jzhang-client-HW12527.log -Dlog4j.configuration=file:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/conf/log4j-cli.properties -Dlogback.configurationFile=file:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/conf/logback.xml -classpath :/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/lib/flink-dist_2.11-1.7-SNAPSHOT.jar:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/lib/flink-python_2.11-1.7-SNAPSHOT.jar:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/lib/flink-shaded-hadoop2-uber-1.7-SNAPSHOT.jar:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/lib/log4j-1.2.17.jar:/Users/jzhang/github/flink/flink-dist/target/flink-1.7-SNAPSHOT-bin/flink-1.7-SNAPSHOT/lib/slf4j-log4j12-1.7.7.jar::: org.apache.flink.client.cli.CliFrontend run -h
   
   Action "run" compiles and runs a program.
   
     Syntax: run [OPTIONS] <jar-file> <arguments>
     "run" action options:
        -c,--class <classname>               Class with the program entry point
                                             ("main" method or "getPlan()" method.
                                             Only needed if the JAR file does not
                                             specify the class in its manifest.
   ...
   ```
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not documented)
   

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> Add option to print flink command when running bin/flink
> --------------------------------------------------------
>
>                 Key: FLINK-10341
>                 URL: https://issues.apache.org/jira/browse/FLINK-10341
>             Project: Flink
>          Issue Type: Improvement
>          Components: Startup Shell Scripts
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>            Priority: Major
>              Labels: pull-request-available
>
> It would be very useful if I can see the final java command which is used to run flink program, specially when I hit very weird issue as flink contributor. 



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