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https://issues.apache.org/jira/browse/FLINK-20165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17234338#comment-17234338
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Robert Metzger commented on FLINK-20165:
----------------------------------------
I believe this is a JVM bug. Searching for "Module system already initialized"
reveals very few search results. Basically just the JVM source code, and this
ticket. We might be the first to hit this issue.
As a mitigation, I propose to update the JDK we are using in our CI docker
image. If the issue occurs in the latest JDK as well, I'll reach out to them.
> YARNSessionFIFOITCase.checkForProhibitedLogContents: Error occurred during
> initialization of boot layer java.lang.IllegalStateException: Module system
> already initialized
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-20165
> URL: https://issues.apache.org/jira/browse/FLINK-20165
> Project: Flink
> Issue Type: Bug
> Components: Deployment / YARN
> Affects Versions: 1.11.3
> Reporter: Dian Fu
> Assignee: Robert Metzger
> Priority: Critical
> Labels: test-stability
> Fix For: 1.11.4
>
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=9597&view=logs&j=298e20ef-7951-5965-0e79-ea664ddc435e&t=8560c56f-9ec1-5c40-4ff5-9d3eaaaa882d
> {code}
> 2020-11-15T22:42:03.3053212Z 22:42:03,303 [ Time-limited test] INFO
> org.apache.flink.yarn.YARNSessionFIFOITCase [] - Finished
> testDetachedMode()
> 2020-11-15T22:42:37.9020133Z [ERROR] Tests run: 5, Failures: 2, Errors: 0,
> Skipped: 2, Time elapsed: 67.485 s <<< FAILURE! - in
> org.apache.flink.yarn.YARNSessionFIFOSecuredITCase
> 2020-11-15T22:42:37.9022015Z [ERROR]
> testDetachedMode(org.apache.flink.yarn.YARNSessionFIFOSecuredITCase) Time
> elapsed: 12.841 s <<< FAILURE!
> 2020-11-15T22:42:37.9023701Z java.lang.AssertionError:
> 2020-11-15T22:42:37.9025649Z Found a file
> /__w/2/s/flink-yarn-tests/target/flink-yarn-tests-fifo-secured/flink-yarn-tests-fifo-secured-logDir-nm-1_0/application_1605480087188_0002/container_1605480087188_0002_01_000002/taskmanager.out
> with a prohibited string (one of [Exception, Started
> [email protected]:8081]). Excerpts:
> 2020-11-15T22:42:37.9026730Z [
> 2020-11-15T22:42:37.9027080Z Error occurred during initialization of boot
> layer
> 2020-11-15T22:42:37.9027623Z java.lang.IllegalStateException: Module system
> already initialized
> 2020-11-15T22:42:37.9033278Z java.lang.IllegalStateException: Module system
> already initialized
> 2020-11-15T22:42:37.9033825Z ]
> 2020-11-15T22:42:37.9034291Z at org.junit.Assert.fail(Assert.java:88)
> 2020-11-15T22:42:37.9034971Z at
> org.apache.flink.yarn.YarnTestBase.ensureNoProhibitedStringInLogFiles(YarnTestBase.java:479)
> 2020-11-15T22:42:37.9035814Z at
> org.apache.flink.yarn.YARNSessionFIFOITCase.checkForProhibitedLogContents(YARNSessionFIFOITCase.java:83)
> {code}
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