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https://issues.apache.org/jira/browse/BEAM-11735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17357929#comment-17357929
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Beam JIRA Bot commented on BEAM-11735:
--------------------------------------
This issue is P2 but has been unassigned without any comment for 60 days so it
has been labeled "stale-P2". If this issue is still affecting you, we care!
Please comment and remove the label. Otherwise, in 14 days the issue will be
moved to P3.
Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed
explanation of what these priorities mean.
> Logging from DoFn doesn't work with Spark Runner in cluster mode
> ----------------------------------------------------------------
>
> Key: BEAM-11735
> URL: https://issues.apache.org/jira/browse/BEAM-11735
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Affects Versions: 2.26.0, 2.27.0
> Environment: Cloudera 6, Hadoop 3, Spark 2.4
> Reporter: Claudio Venturini
> Priority: P2
> Labels: SLF4J, log-aggregation, log4j, logging,, spark, stale-P2
>
> Log messages emitted by any DoFn is not logged by spark executors when the
> pipeline is run with Spark in cluster deployment mode (on YARN). Tested on
> Cloudera 6 with Spark 2.4.
> I made a test project to reproduce the issue:
> [https://github.com/ventuc/beam-log-test]. Run it with:
> {{spark-submit --class beam.tests.log.LogTesting --name LogTesting
> --deploy-mode cluster --master yarn --conf
> "spark.driver.extraJavaOptions=-Dlog4j.configuration=[file:log4j.properties|file://log4j.properties/]"
> --conf
> "spark.executor.extraJavaOptions=-Dlog4j.configuration=[file:log4j.properties|file://log4j.properties/]"
> --files $HOME/log4j.properties beam-log-test-0.0.1-SNAPSHOT.jar}}
> To retrieve logs from YARN run:
> {{yarn logs -applicationId <app_id>}}
> As you can see, logs from the beam.tests.log appear only in the driver's log,
> and not in the executor's log.
>
> There's not any documentation about how to handle logs in Beam with the Spark
> runner. Please document it as requested also by BEAM-792.
>
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