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From "Yun Gao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-12171) The network buffer memory size should not be checked against the heap size on the TM side
Date Fri, 12 Apr 2019 11:56:00 GMT
Yun Gao created FLINK-12171:
-------------------------------

             Summary: The network buffer memory size should not be checked against the heap
size on the TM side
                 Key: FLINK-12171
                 URL: https://issues.apache.org/jira/browse/FLINK-12171
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Configuration, Runtime / Network
    Affects Versions: 1.8.0, 1.7.2
         Environment: I tested with Flink-1.7.2 with computed network buffer size = 5G and
taskmanager.heap.mb=6114, and the exception about checking is triggered. Yarn Session mode,
Yarn single job mode and standalone mode are all tested.

 

I haven't tested on Flink-1.8 yet, but the logic seems to be not changed to me after reading
the corresponding source code. 
            Reporter: Yun Gao


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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