xuanyuanking opened a new pull request #25327: [SPARK-28593][CORE] Rename ShuffleClient to BlockStoreClient which more close to its usage URL: https://github.com/apache/spark/pull/25327 ## What changes were proposed in this pull request? 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(as the [discussion](https://github.com/apache/spark/pull/24892#discussion_r300173331)), 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. ## How was this patch tested? Existing UT.
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