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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-285) Data nodes cannot re-join the cluster once connection is lost
Date Wed, 07 Jun 2006 17:28:31 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-285?page=all ]

Hairong Kuang updated HADOOP-285:
---------------------------------

    Attachment: datanode.patch

This patch starts the data receiver thread in "run" instead of "offerservice". So it will
not be restarted after a connect is lost.

> Data nodes cannot re-join the cluster once connection is lost
> -------------------------------------------------------------
>
>          Key: HADOOP-285
>          URL: http://issues.apache.org/jira/browse/HADOOP-285
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>     Versions: 0.3.0
>     Reporter: Konstantin Shvachko
>     Assignee: Hairong Kuang
>  Attachments: datanode.patch
>
> A data node looses connection to a name node and then tries to offerService() again.
> HADOOP-270 changes force it to start dataXceiveServer, which is already started and in
this case
> throws IllegalThreadStateException, which goes on in a loop, and never reaches the heartbeat
section.
> So the data node never re-joins the cluster, while from the out side it looks it's still
running.
> This is another reason why we see missing data, and don't see failed data nodes.

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