Recently 3 machines of my cluster stopped working with the following message
Shutting down. Incompatible version or revision.TaskTracker version '2.0.0-mr1-cdh4.1.2' and build '2.0.0-mr1-cdh4.1.2 from Unknown by jenkins source checksum b7f8aa714447372afd71f8fc3505b304' and JobTracker version '2.0.0-mr1-cdh4.1.3' and build '2.0.0-mr1-cdh4.1.3 from Unknown by jenkins source checksum 0222a5fdd4d9e3a2ea8f499b8a275db0 and hadoop.relaxed.worker.version.check is enabled and hadoop.skip.worker.version.check is not enabled
I did no updates of changed any configuration manually. They were OK in one
second, I restarted the cluster and in the other this happened.
In all machines that are working properly I have
in /usr/lib/hadoop-0.20-mapreduce the version with end "1.3".
In those 3 that stopped working I have in /usr/lib/hadoop-0.20-mapreduce
the version of jars ending with "1.2"
Just a remark: all machines have the same configuration and had hadoop
installed in the same day (at same time).
My ideas are:
a) try to update those 3 machines with problems;
b) Copy the 1.3 .jar files to these machines.
Anyone has any idea what caused this problem or how I can solve it?
Thanks in advance,