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Hadoop, mail # general - JVM is crashing for systems with NFS


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JVM is crashing for systems with NFS
Mihail Ionescu 2012-12-08, 17:01
I have a small cluster of 15 machines, running hadoop-1-0-2. Each machine
runs kernel 2.6.35, has a root disk mounted under nfs (all machines have
the same root file system) and  a local disk (mounted under
/mnt/localdisk). I installed hadoop under /mnt/localdisk/hadoop, which the
conf directory shared for all machines (in order to change the
configuration for all machines in an easy manner). I am using jdk 1.6.23,
installed locally on /mnt/localdisk/jdk. On each machine a datanode and a
tasktracker are running, each task tracker has 2 slots for mapper and 2
slots for reducer.

The problem is that, after running various map-reduce tasks, JVM crashes
pretty frequently on many machines. There is no rule I could find,
sometimes the datanode is crashing, other times tasktracker, or maybe even
both. They generate a hs_err file, with SIGBUS 0x7, if needed I can post
the contents of that file, I could not find anything interesting there.

Does anyone had this problem? Maybe because the root file system is shared
and hadoop tries to writes some files in /tmp or something and because the
file system is shared across all machines? Any help would be greatly
appreciated.

Thanks,

Mihail