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https://issues.apache.org/jira/browse/FLINK-33879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weijie Guo closed FLINK-33879.
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Resolution: Fixed
master(1.19) via 879509d7ca886f8f0ed4dd966e859d3c2a5aa231.
> Hybrid Shuffle may stop working for a while during redistribution
> -----------------------------------------------------------------
>
> Key: FLINK-33879
> URL: https://issues.apache.org/jira/browse/FLINK-33879
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Network
> Reporter: Jiang Xin
> Assignee: Jiang Xin
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.0
>
>
> Currently, the Hybrid Shuffle can work with the memory tier and disk tier
> together, however, in the following scenario the result partition would stop
> working.
> Suppose we have a shuffle task with 2 sub-partitions. The LocalBufferPool has
> 15 buffers, the memory tier can use at most 15-(2*(2+1)+1) = 8 buffers
> according to `TieredStorageMemoryManagerImpl#getMaxNonReclaimableBuffers`. If
> the memory tier uses up all 8 buffers and the input channel consumes them
> very slowly because of problems, e.g. unstable network, the disk tier can
> still work with 1 reserved buffer. However, if a redistribution happens now
> and the pool size is decreased to less than 8, then the BufferAccumulator can
> not request buffers anymore, and thus the result partition stops working
> until the buffers in the memory tier are recycled.
> The purpose is to make the result partition still work with the disk tier and
> write the shuffle data to disk so that once the input channel is ready, the
> data on the disk can be consumed immediately.
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