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From "Suresh Srinivas (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-183) MapReduce Streaming job hang when all replications of the input file has corrupted!
Date Wed, 25 Jan 2012 21:37:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Suresh Srinivas resolved HDFS-183.

    Resolution: Won't Fix

This bug has been open for a while, with no reply to the last comment posted. Closing for
now. Please re-open the bug or open a new bug, if the problem still persists.
> MapReduce Streaming job hang when all replications of the input file has corrupted!
> -----------------------------------------------------------------------------------
>                 Key: HDFS-183
>                 URL: https://issues.apache.org/jira/browse/HDFS-183
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZhuGuanyin
>            Priority: Critical
> On some special cases, all replications of a given file has truncated to zero  but the
namenode still hold the original size (we don't know why),  the mapreduce streaming job will
hang if we don't specified mapred.task.timeout when the input files contain this corrupted
file, even the dfs shell "cat" will hang when fetch data from this corrupted file.
> We found that job hang at DFSInputStream.blockSeekTo() when chosing a datanode.  The
following test will show:
> 1)	Copy a small file to hdfs. 
> 2)	Get the file blocks and login to these datanodes, and truncate these blocks to zero.
> 3)	Cat this file through dfs shell "cat"
> 4)	Cat command will enter dead loop.

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