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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4517) unstable dfs when running jobs on 0.18.1
Date Mon, 27 Oct 2008 17:50:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642976#action_12642976
] 

Raghu Angadi commented on HADOOP-4517:
--------------------------------------


Looks good. Couple of rename suggestions : 

- {{ getOngoingCreatesOrUpdateBlock()}} could be called {{tryUpdateBlock()}}. I think JavaDoc
should be better.
-  {{findAndUpdatedBlock()}} could be folded in to {{tryUpdateBlock()}}.

I think it will be better to get a confirmation from Christian's load before committing it..
or at least before 0.18.2 is released.

> unstable dfs when running jobs on 0.18.1
> ----------------------------------------
>
>                 Key: HADOOP-4517
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4517
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.1
>         Environment: hadoop-0.18.1 plus patches HADOOP-4277 HADOOP-4271 HADOOP-4326 HADOOP-4314
HADOOP-3914 HADOOP-4318 HADOOP-4351 HADOOP-4395
>            Reporter: Christian Kunz
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.2, 0.19.1, 0.20.0
>
>         Attachments: 4517_20081024.patch, 4517_20081024b_0.18.patch, 4517_20081024c_0.18.patch,
4517_20081024d.patch, 4517_20081024d_0.18.patch, datanode.out
>
>
> 2 attempts of a job using 6000 maps, 1900 reduces
> 1.st attempt: failed during reduce phase after 22 hours with 31 dead datanodes most of
which became unresponsive due to an exception; dfs lost blocks
> 2nd attempt: failed during map phase after 5 hours with 5 dead datanodes due to exception;
dfs lost blocks responsible for job failure.
> I will post typical datanode exception and attach thread dump.

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