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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 Sun, 19 Oct 2014 05:15:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176221#comment-14176221
] 

Hadoop QA commented on HDFS-7265:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12675706/h7265_20141018.patch
  against trunk revision 8256766.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication
                  org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencing
                  org.apache.hadoop.hdfs.server.balancer.TestBalancer
                  org.apache.hadoop.hdfs.web.TestWebHDFSXAttr

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8450//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8450//console

This message is 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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