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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 Sat, 02 May 2015 05:12:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525036#comment-14525036
] 

Hadoop QA commented on HDFS-7264:
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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/12675891/h7264_20141020.patch
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| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10702/console |


This message was 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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