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https://issues.apache.org/jira/browse/BEAM-9030?focusedWorklogId=368535&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-368535
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ASF GitHub Bot logged work on BEAM-9030:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 09/Jan/20 00:50
            Start Date: 09/Jan/20 00:50
    Worklog Time Spent: 10m 
      Work Description: lukecwik commented on issue #10463: [BEAM-9030] Bump 
grpc to 1.26.0
URL: https://github.com/apache/beam/pull/10463#issuecomment-572328778
 
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 368535)
    Time Spent: 5h 50m  (was: 5h 40m)

> Bump grpc to 1.26.0
> -------------------
>
>                 Key: BEAM-9030
>                 URL: https://issues.apache.org/jira/browse/BEAM-9030
>             Project: Beam
>          Issue Type: Bug
>          Components: java-fn-execution, runner-flink
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>            Priority: Major
>             Fix For: 2.19.0
>
>          Time Spent: 5h 50m
>  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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