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Posted to dev@flink.apache.org by "Oleksandr Nitavskyi (JIRA)" <ji...@apache.org> on 2019/01/19 09:52:00 UTC

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

Oleksandr Nitavskyi created FLINK-11396:
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             Summary: MetricStore creates significant GC pressure
                 Key: FLINK-11396
                 URL: https://issues.apache.org/jira/browse/FLINK-11396
             Project: Flink
          Issue Type: Bug
            Reporter: Oleksandr Nitavskyi


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. 



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