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https://issues.apache.org/jira/browse/SPARK-32663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181138#comment-17181138
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Attila Zsolt Piros commented on SPARK-32663:
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You are right. The clients will be closed via
[TransportClientFactory#close()|https://github.com/attilapiros/spark/blob/e6795cd3416bbe32505efd4c1fa3202f451bf74d/common/network-common/src/main/java/org/apache/spark/network/client/TransportClientFactory.java#L324].
> 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
> Priority: Major
>
> 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] [~mridulm80]
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