Github user caneGuy commented on the issue:
https://github.com/apache/spark/pull/18723
@kiszk Thanks for your time.
Yes,you are right.
1.OOM happens at io.netty.buffer.CompositeByteBuf.allocBuffer when one
executor(client) fetch blocks from an other(server) , oom happens at server
side before response to client.
2.Components number depends on chunks' length.Low-level is a list,since we
do not need to remove or update component in the list, i can not think of any
downside in our usage.However, if we do not consolidate we can avoid copy,which
will improve the performance.
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