[jira] [Resolved] (FLINK-11396) MetricStore creates significant GC pressure

["Oleksandr Nitavskyi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-11396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleksandr Nitavskyi resolved FLINK-11396.
-----------------------------------------
    Fix Version/s: 1.9.0
       Resolution: Fixed

> 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
>             Fix For: 1.9.0
>
>         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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