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https://issues.apache.org/jira/browse/FLINK-11396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-11396.
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Fix Version/s: (was: 1.9.0)
Resolution: Later
We need to validate if this problem still exists in the same way in the latest
versions of Flink.
> MetricStore creates significant GC pressure
> -------------------------------------------
>
> Key: FLINK-11396
> URL: https://issues.apache.org/jira/browse/FLINK-11396
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Metrics
> Reporter: Oleksandr Nitavskyi
> Priority: Major
> Attachments: GC_parallel_flink_job_manager.log, g1.txt, gc_example.txt
>
>
> On Flink version 1.6.x we observe a significant increase of the latency in
> UI.
> After performance profiling, we have concluded that during UI rendering
> back-end spends 50% of the time on GC pauses, which means that Flink 1.6.x is
> not friendly with G1 GC ergonomics configurations.
> On Flink side, MetricStore creates a huge amount of short living objects for
> our job, which provokes a lot of Young GC pauses for a non-small job, with
> around 50 operators and 120 parallelisms.
> Samples of GC logs are in attach.
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