[jira] [Created] (SPARK-32663) TransportClient getting closed when there are outstanding requests to the server

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

Chandni Singh created SPARK-32663:
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             Summary: TransportClient getting closed when there are outstanding requests to the server
                 Key: SPARK-32663
                 URL: https://issues.apache.org/jira/browse/SPARK-32663
             Project: Spark
          Issue Type: Bug
          Components: Shuffle
    Affects Versions: 3.0.0
            Reporter: Chandni Singh


The implementation of {{removeBlocks}} and {{getHostLocalDirs}} in {{ExternalBlockStoreClient}} closes the client after processing a response in the callback. 

This is a cached client which will be re-used for other responses. There could be other outstanding request to the shuffle service, so it should not be closed after processing a response. 
Seems like this is a bug introduced with SPARK-27651 and SPARK-27677. 

The older methods  {{registerWithShuffleServer}} and {{fetchBlocks}} didn't close the client.

cc [~attilapiros] [~vanzin] [~mridul]



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