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https://issues.apache.org/jira/browse/FLINK-31288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weijie Guo updated FLINK-31288:
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Description:
Only pipelined / pipelined-bounded partition needs overdraft buffer. More
specifically, there is no reason to request more buffers for non-pipelined
(i.e. batch) shuffle. The reasons are as follows:
1. For BoundedBlockingShuffle, each full buffer will be directly released.
2. For SortMergeShuffle, the maximum capacity of buffer pool is 4 *
numSubpartitions. It is efficient enough to spill this part of memory to disk.
3. For Hybrid Shuffle, the buffer pool is unbounded. If it can't get a normal
buffer, it also can't get an overdraft buffer.
> Disable overdraft buffer for batch shuffle
> ------------------------------------------
>
> Key: FLINK-31288
> URL: https://issues.apache.org/jira/browse/FLINK-31288
> Project: Flink
> Issue Type: Bug
> Reporter: Weijie Guo
> Assignee: Weijie Guo
> Priority: Major
>
> Only pipelined / pipelined-bounded partition needs overdraft buffer. More
> specifically, there is no reason to request more buffers for non-pipelined
> (i.e. batch) shuffle. The reasons are as follows:
> 1. For BoundedBlockingShuffle, each full buffer will be directly released.
> 2. For SortMergeShuffle, the maximum capacity of buffer pool is 4 *
> numSubpartitions. It is efficient enough to spill this part of memory to disk.
> 3. For Hybrid Shuffle, the buffer pool is unbounded. If it can't get a normal
> buffer, it also can't get an overdraft buffer.
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