Chenzhao Guo created SPARK-27603:
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Summary: Make ShuffleClient pluggable
Key: SPARK-27603
URL: https://issues.apache.org/jira/browse/SPARK-27603
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.4.0
Reporter: Chenzhao Guo
ShuffleClient resides in BlockManager, it's the client to read other executors'
shuffle files.
ShuffleManager is pluggable, however, ShuffleClient is restrained to be either
a `NettyBlockTransferService` or an `ExternalShuffleClient`.
When a custom ShuffleManager is used, the current 2 implementations of
ShuffleClient may not be enough. For example, a shuffle manager leveraging
remote storage may not need either of these 2 ShuffleClient. It may require the
network transferring shuffle data index(the ranges of blocks) from the executor
who wrote them, and then read directly from the globally-accessible remote
storage, instead of transfering data through network as the 2 implementations
do. Also, there is need for non-Netty based block transfer service.
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