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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3232) Datanodes time out
Date Fri, 09 May 2008 17:08:57 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595673#action_12595673
] 

Doug Cutting commented on HADOOP-3232:
--------------------------------------

Oops.  I posted my previous comment before I saw your last comment.  You're right, I was confusing
DU and DF.  And I missed the refresh in the ctor.  Sorry!  That resolves most of my concerns.
 Since this is called much more frequently than I was thinking, it makes sense for it not
to be synchronous.  I think my only remaining concern is the default interval, which you've
said you'd address.  Thanks!

> 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
>         Environment: 10 node cluster + 1 namenode
>            Reporter: Johan Oskarsson
>            Priority: Critical
>             Fix For: 0.18.0
>
>         Attachments: du-nonblocking-v1.patch, du-nonblocking-v2-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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