unstable dfs when running jobs on 0.18.1
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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
2 attempts of a job using 6000 maps, 19000 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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