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https://issues.apache.org/jira/browse/HDFS-14710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915960#comment-16915960
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Íñigo Goiri commented on HDFS-14710:
------------------------------------

This looks good.
Minor style comments in the test:
* Add a a space in between the variables setup and the creation (i.e., new line 
in 258).
* Move 263 to the var setup.
* If you define some variables as final, for consistency you can do it to all.
* When creating the file from the Router (lines 261 and after) probably add the 
comment right before the block.
* Line 295 checks the result of newBlock. For consistency with the other 
checks, it should be in line 293.
* For consistency, not extra line in 301.

> 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
>            Assignee: xuzq
>            Priority: Minor
>         Attachments: HDFS-14710-trunk-001.patch, HDFS-14710-trunk-002.patch, 
> HDFS-14710-trunk-003.patch, HDFS-14710-trunk-004.patch
>
>
> 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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