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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5286) DFS client blocked for a long time reading blocks of a file on the JobTracker
Date Thu, 26 Feb 2009 21:53:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-5286:
------------------------------------

    Component/s:     (was: dfs)
                 mapred
       Assignee: Hemanth Yamijala  (was: Raghu Angadi)

> DFS client blocked for a long time reading blocks of a file on the JobTracker
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-5286
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5286
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Hemanth Yamijala
>            Assignee: Hemanth Yamijala
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: jt-log-for-blocked-reads.txt
>
>
> On a large cluster, we've observed that DFS client was blocked on reading a block of
a file for almost 1 and half hours. The file was being read by the JobTracker of the cluster,
and was a split file of a job. On the NameNode logs, we observed that the block had a message
as follows:
> Inconsistent size for block blk_2044238107768440002_840946 reported from <ip>:<port>
current size is 195072 reported size is 1318567
> Details follow.
>  

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