[jira] [Commented] (SPARK-33331) Limit the number of pending blocks in memory and store blocks that collide

["Min Shen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-33331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399845#comment-17399845 ] 

Min Shen commented on SPARK-33331:
----------------------------------

With the change in SPARK-36423, I think this issue is further alleviated.

We can still give this idea a try though.

> Limit the number of pending blocks in memory and store blocks that collide
> --------------------------------------------------------------------------
>
>                 Key: SPARK-33331
>                 URL: https://issues.apache.org/jira/browse/SPARK-33331
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Shuffle
>    Affects Versions: 3.1.0
>            Reporter: Chandni Singh
>            Priority: Major
>
> This jira addresses the below two points:
>  1. In {{RemoteBlockPushResolver}}, bytes that cannot be merged immediately are stored in memory. The stream callback maintains a list of {{deferredBufs}}. When a block cannot be merged it is added to this list. Currently, there isn't a limit on the number of pending blocks. We can limit the number of pending blocks in memory. There has been a discussion around this here:
> [https://github.com/apache/spark/pull/30062#discussion_r514026014]
> 2. When a stream doesn't get an opportunity to merge, then {{RemoteBlockPushResolver}} ignores the data from that stream. Another approach is to store the data of the stream in {{AppShufflePartitionInfo}} when it reaches the worst-case scenario. This may increase the memory usage of the shuffle service though. However, given a limit introduced with 1 we can try this out.
>  More information can be found in this discussion:
>  [https://github.com/apache/spark/pull/30062#discussion_r517524546]



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