[SPARK-28593] Rename ShuffleClient to BlockStoreClient which more close to its usage - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 3.0.0
Fix Version/s: 3.0.0
Component/s: Spark Core
Labels:
None

Description

After ~~SPARK-27677~~, the shuffle client not only handles the shuffle block but also responsible for local persist RDD blocks. For better code scalability and clear semantics, here we rename ShuffleClient to BlockStoreClient. Correspondingly rename the ExternalShuffleClient to ExternalBlockStoreClient, also change the server-side class from ExternalShuffleBlockHandler to ExternalBlockHandler. Note, we still keep the name of BlockTransferService, because the `Service` contains both client and server, also the name of BlockTransferService is not referencing shuffle client only.