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https://issues.apache.org/jira/browse/FLINK-19005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186472#comment-17186472
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João Boto commented on FLINK-19005:
-----------------------------------
[~trohrmann] that can be applied to a standalone cluster? ([~DaDaShen] and
[~gestevez] are using standalone cluster)
It seems that Flink is not clearing the JDBC references, if we only use
TableEnvironment or InputFormat we only provide the jdbc library, all iteration
with the library is done by Flink, and the cleaning up must be done by Flink as
we dont have access to it.
I will help [~gestevez] to prove the [~chesnay] option of add it to /lib
instead of bundling them in the user-jar..
> 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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