xuzq created HDFS-14710:
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Summary: RBF：Improve some RPC performances
Key: HDFS-14710
URL: https://issues.apache.org/jira/browse/HDFS-14710
Project: Hadoop HDFS
Issue Type: Improvement
Components: rbf
Reporter: xuzq
We can improve some RPC performance if the extendedBlock is not null.
Such as addBlock, getAdditionalDatanode and complete.
Since HDFS encourages user to write large files, so the extendedBlock is not
null in most case.
In the scenario of Multiple Destination and large file, the effect is more
obvious.
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