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https://issues.apache.org/jira/browse/FLINK-19005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186325#comment-17186325
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Chesnay Schepler commented on FLINK-19005:
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Well of course that works; you clean _all drivers,_ then things can get GC'd.
However, you also mess with any other Task from the same job running in that
JVM that requires JDBC at the same time, because all of a sudden you are
de-registering drivers, and there is unfortunately no guarantee that they will
be re-registered when the class is reloaded (because JDBC is a mess).
Additionally, you are also de-registering all drivers that were loaded by the
SystemClassLoader, which presumably should be left alone.
> 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,
> 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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