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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3232) Datanodes time out
Date Wed, 14 May 2008 16:42:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596820#action_12596820
] 

Raghu Angadi commented on HADOOP-3232:
--------------------------------------

Actually requiring start() is not so bad. Also DataNodes could invoke shutdown() when in side
its shutdown. It will also remove the findbugs warning.


> Datanodes time out
> ------------------
>
>                 Key: HADOOP-3232
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3232
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.2, 0.16.3, 0.16.4
>         Environment: 10 node cluster + 1 namenode
>            Reporter: Johan Oskarsson
>            Assignee: Johan Oskarsson
>            Priority: Critical
>             Fix For: 0.18.0
>
>         Attachments: du-nonblocking-v1.patch, du-nonblocking-v2-trunk.patch, du-nonblocking-v4-trunk.patch,
du-nonblocking-v5-trunk.patch, hadoop-hadoop-datanode-new.log, hadoop-hadoop-datanode-new.out,
hadoop-hadoop-datanode.out, hadoop-hadoop-namenode-master2.out
>
>
> I recently upgraded to 0.16.2 from 0.15.2 on our 10 node cluster.
> Unfortunately we're seeing datanode timeout issues. In previous versions we've often
seen in the nn webui that one or two datanodes "last contact" goes from the usual 0-3 sec
to ~200-300 before it drops down to 0 again.
> This causes mild discomfort but the big problems appear when all nodes do this at once,
as happened a few times after the upgrade.
> It was suggested that this could be due to namenode garbage collection, but looking at
the gc log output it doesn't seem to be the case.

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