job tracker should refuse connection from a task tracker with a different
version number
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Key: HADOOP-236
URL: http://issues.apache.org/jira/browse/HADOOP-236
Project: Hadoop
Type: Bug
Components: mapred
Versions: 0.2.1
Reporter: Hairong Kuang
After one mapred system upgrade, we noticed that all tasks assigned to one task
tracker failed. It turned out that for some reason the task tracker was not
upgraded.
To avoid this, a task tracker should reports its version # when it registers
itsself with a job tracker. If the job tracker receives an inconsistent version
#, it should refuse the connection.
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