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https://issues.apache.org/jira/browse/HDFS-7265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haohui Mai updated HDFS-7265:
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Labels: (was: BB2015-05-TBR)
> Use a throttler for replica write in datanode
> ---------------------------------------------
>
> Key: HDFS-7265
> URL: https://issues.apache.org/jira/browse/HDFS-7265
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h7265_20141018.patch
>
>
> BlockReceiver process packets in BlockReceiver.receivePacket() as follows
> # read from socket
> # enqueue the ack
> # write to downstream
> # write to disk
> The above steps is repeated for each packet in a single thread. When there
> are a lot of concurrent writes in a datanode, the write time in #4 becomes
> very long. As a result, it leads to SocketTimeoutException since it cannot
> read from the socket for a long time.
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