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From "Yun Gao (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (FLINK-12171) The network buffer memory size should not be checked against the heap size on the TM side
Date Fri, 12 Apr 2019 12:00:05 GMT

     [ https://issues.apache.org/jira/browse/FLINK-12171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yun Gao reassigned FLINK-12171:

    Assignee: Yun Gao

> The network buffer memory size should not be checked against the heap size on the TM
> -----------------------------------------------------------------------------------------
>                 Key: FLINK-12171
>                 URL: https://issues.apache.org/jira/browse/FLINK-12171
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Configuration, Runtime / Network
>    Affects Versions: 1.7.2, 1.8.0
>         Environment: Flink-1.7.2, and Flink-1.8 seems have not modified the logic here.
>            Reporter: Yun Gao
>            Assignee: Yun Gao
>            Priority: Major
> Currently when computing the network buffer memory size on the TM side in _TaskManagerService#calculateNetworkBufferMemory_`(version
1.8 or 1.7) or _NetworkEnvironmentConfiguration#calculateNewNetworkBufferMemory_(master),
the computed network buffer memory size is checked to be less than `maxJvmHeapMemory`. However,
in TM side, _maxJvmHeapMemory_ stores the maximum heap memory (namely -Xmx) .
> With the above process, when TM starts, -Xmx is computed in RM or in _taskmanager.sh_
with (container memory - network buffer memory - managed memory),  thus the above checking
implies that the heap memory of the TM must be larger than the network memory, which seems
to be not necessary.
> Therefore, I think the network buffer memory size also need to be checked against the
total memory instead of the heap memory on the TM  side:
>  # Checks that networkBufFraction < 1.0.
>  # Compute the total memory by ( jvmHeapNoNet / (1 - networkBufFraction)).
>  # Compare the network buffer memory with the total memory.
> This checking is also consistent with the similar one done on the RM side.

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