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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7265) Use a throttler for replica write in datanode
Date Sat, 02 May 2015 05:04:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524975#comment-14524975
] 

Hadoop QA commented on HDFS-7265:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch |   0m  0s | The patch command could not apply the patch during
dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12675706/h7265_20141018.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10680/console |


This message was automatically generated.

> 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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