ASF GitHub Bot logged work on BEAM-9030:

                Author: ASF GitHub Bot
            Created on: 14/Jan/20 13:17
            Start Date: 14/Jan/20 13:17
    Worklog Time Spent: 10m 
      Work Description: sunjincheng121 commented on issue #10578: [BEAM-9030] 
Migrate Beam to use beam-vendor-grpc-1_26_0
URL: https://github.com/apache/beam/pull/10578#issuecomment-574168723
   @lukecwik  It looks that only committers could trigger the test now, could 
you help to trigger the test? Thanks a lot!
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Issue Time Tracking

    Worklog Id:     (was: 371596)
    Time Spent: 6h 20m  (was: 6h 10m)

> Bump grpc to 1.26.0
> -------------------
>                 Key: BEAM-9030
>                 URL: https://issues.apache.org/jira/browse/BEAM-9030
>             Project: Beam
>          Issue Type: Improvement
>          Components: java-fn-execution, runner-flink
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>            Priority: Major
>          Time Spent: 6h 20m
>  Remaining Estimate: 0h
> When submitting a Python word count job to a Flink session/standalone cluster 
> repeatedly, the meta space usage of the task manager of the Flink cluster 
> will continuously increase (about 40MB each time). The reason is that the 
> Beam classes are loaded with the user class loader in Flink and there are 
> problems with the implementation of `ProcessManager`(from Beam) and 
> `ThreadPoolCache`(from netty) which may cause the user class loader could not 
> be garbage collected even after the job finished which causes the meta space 
> memory leak eventually. You can refer to FLINK-15338[1] for more information.
> Regarding to `ProcessManager`, I have created a JIRA BEAM-9006[2] to track 
> it. Regarding to `ThreadPoolCache`, it is a Netty problem and has been fixed 
> in NETTY#8955[3]. Netty 4.1.35 Final has already included this fix and GRPC 
> 1.22.0 has already dependents on Netty 4.1.35 Final. So we need to bump the 
> version of GRPC to 1.22.0+ (currently 1.21.0).
> What do you think?
> [1] https://issues.apache.org/jira/browse/FLINK-15338
> [2] https://issues.apache.org/jira/browse/BEAM-9006
> [3] [https://github.com/netty/netty/pull/8955]

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