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https://issues.apache.org/jira/browse/HDFS-7279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202938#comment-14202938
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Haohui Mai commented on HDFS-7279:
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Updated the patch to address Nicholas's comments.
I cleaned up the usages of LOG {{SimpleHttpProxyHandler}} in the v8 patch. I
kept the LOG at INFO level when an exception occurs. My intuition is that it is
usually not a serious issue when this type of error happens, thus making them
WARN might generate unnecessary noise. I have no strong opinion on that, I'm
okay to change it to WARN if you think it is more appropriate.
> Use netty to implement DatanodeWebHdfsMethods
> ---------------------------------------------
>
> Key: HDFS-7279
> URL: https://issues.apache.org/jira/browse/HDFS-7279
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, webhdfs
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HDFS-7279.000.patch, HDFS-7279.001.patch,
> HDFS-7279.002.patch, HDFS-7279.003.patch, HDFS-7279.004.patch,
> HDFS-7279.005.patch, HDFS-7279.006.patch, HDFS-7279.007.patch,
> HDFS-7279.008.patch
>
>
> Currently the DN implements all related webhdfs functionality using jetty. As
> the current jetty version the DN used (jetty 6) lacks of fine-grained buffer
> and connection management, DN often suffers from long latency and OOM when
> its webhdfs component is under sustained heavy load.
> This jira proposes to implement the webhdfs component in DN using netty,
> which can be more efficient and allow more finer-grain controls on webhdfs.
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