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

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

jinhai created SPARK-37006:
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             Summary: 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


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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