Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18211
In this pr:
1. Instead of `chunkIndex`, fetch chunk by `String chunkId`. Server doesn't
cache the blocks list.
2. In `OpenBlocks`, only metadata(e.g. appId, executorId) of the stream is
send. Thus client doesn't need to send the metadata in following fetching.
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