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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-724) Pipeline close hangs if one of the datanode is not responsive.
Date Mon, 16 Nov 2009 21:10:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778542#action_12778542
] 

Hairong Kuang commented on HDFS-724:
------------------------------------

The timestamp meta information could be added to regular data packets as well. My plan is
not to send heartbeats periodically. Instead a heartbeat is sent only if the connection is
idle for too long time.

> Pipeline close hangs if one of the datanode is not responsive.
> --------------------------------------------------------------
>
>                 Key: HDFS-724
>                 URL: https://issues.apache.org/jira/browse/HDFS-724
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Hairong Kuang
>         Attachments: h724_20091021.patch
>
>
> In the new pipeline design, pipeline close is implemented by sending an additional empty
packet.  If one of the datanode does not response to this empty packet, the pipeline hangs.
 It seems that there is no timeout.

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