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