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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7264) Tha last datanode in a pipeline should send a heartbeat when there is no traffic
Date Mon, 20 Oct 2014 19:52:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177386#comment-14177386
] 

Hadoop QA commented on HDFS-7264:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12675891/h7264_20141020.patch
  against trunk revision d5084b9.

    {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-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:

                  org.apache.hadoop.yarn.server.resourcemanager.TestMoveApplication

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8455//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8455//console

This message is automatically generated.

> Tha last datanode in a pipeline should send a heartbeat when there is no traffic
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-7264
>                 URL: https://issues.apache.org/jira/browse/HDFS-7264
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7264_20141017.patch, h7264_20141020.patch
>
>
> When the client is writing slowly, the client will send a heartbeat to signal that the
connection is still alive.  This case works fine.
> However, when a client is writing fast but some of the datanodes in the pipeline are
busy, a PacketResponder may get a timeout since no ack is sent from the upstream datanode.
 We suggest that the last datanode in a pipeline should send a heartbeat when there is no
traffic.



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