[jira] [Commented] (SPARK-37006) MapStatus adds localDirs to avoid the rpc request by method getHostLocalDirs when shuffle reading

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

    [ https://issues.apache.org/jira/browse/SPARK-37006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428714#comment-17428714 ] 

jinhai commented on SPARK-37006:
--------------------------------

hi [~cloud_fan]，can you review this issue for me?

> MapStatus adds localDirs to avoid the rpc request by method getHostLocalDirs when shuffle reading
> -------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-37006
>                 URL: https://issues.apache.org/jira/browse/SPARK-37006
>             Project: Spark
>          Issue Type: Improvement
>          Components: Shuffle
>    Affects Versions: 3.1.2
>            Reporter: jinhai
>            Priority: Major
>
> In shuffle reading, in order to get the hostLocalDirs value when executing fetchHostLocalBlocks, we need ExternalBlockStoreClient or NettyBlockTransferService to make a rpc request.
> And when externalShuffleServiceEnabled, there is no need to registerExecutor and so on in the ExternalShuffleBlockResolver class.
> Throughout the spark shuffle module, a lot of code logic is written to deal with localDirs.
> We can directly add localDirs to the BlockManagerId class of MapStatus to get datafile and indexfile.



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