MapReduce Streaming job hang when all replications of the input file has
corrupted!
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Key: HADOOP-4291
URL: https://issues.apache.org/jira/browse/HADOOP-4291
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.18.1
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 little 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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