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https://issues.apache.org/jira/browse/FLINK-19005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188456#comment-17188456
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Guillermo Sánchez commented on FLINK-19005:
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Thanks [~chesnay], [~trohrmann], I tried your solution, changed oracle library
dependency on my jobs pom.xml to provided, and now it consumes much less
metaspace and creates less classes on every execution, and finally, used
metaspace drops some hours after executions finished.
I have uploaded [^heapdump-after_metaspace_dropped.hprof] file, generated after
metaspace had dropped, after 6 executions of my batch job.
Could you examine it to check if there is still any memory leak or it is
completely solved?
> used metaspace grow on every execution
> --------------------------------------
>
> Key: FLINK-19005
> URL: https://issues.apache.org/jira/browse/FLINK-19005
> Project: Flink
> Issue Type: Bug
> Components: Client / Job Submission, Runtime / Configuration,
> Runtime / Coordination
> Affects Versions: 1.11.1
> Reporter: Guillermo Sánchez
> Assignee: Chesnay Schepler
> Priority: Major
> Attachments: heap_dump_after_10_executions.zip,
> heap_dump_after_1_execution.zip, heap_dump_echo_lee.tar.xz,
> heapdump-after_metaspace_dropped.hprof, modified-jdbc-inputformat.png,
> origin-jdbc-inputformat.png
>
>
> Hi !
> Im running a 1.11.1 flink cluster, where I execute batch jobs made with
> DataSet API.
> I submit these jobs every day to calculate daily data.
> In every execution, cluster's used metaspace increase by 7MB and its never
> released.
> This ends up with an OutOfMemoryError caused by Metaspace every 15 days and i
> need to restart the cluster to clean the metaspace
> taskmanager.memory.jvm-metaspace.size is set to 512mb
> Any idea of what could be causing this metaspace grow and why is it not
> released ?
>
> ================================================
> === Summary ======================================
> ================================================
> Case 1, reported by [~gestevez]:
> * Flink 1.11.1
> * Java 11
> * Maximum Metaspace size set to 512mb
> * Custom Batch job, submitted daily
> * Requires restart every 15 days after an OOM
> Case 2, reported by [~Echo Lee]:
> * Flink 1.11.0
> * Java 11
> * G1GC
> * WordCount Batch job, submitted every second / every 5 minutes
> * eventually fails TaskExecutor with OOM
> Case 3, reported by [~DaDaShen]
> * Flink 1.11.0
> * Java 11
> * WordCount Batch job, submitted every 5 seconds
> * growing Metaspace, eventually OOM
>
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