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hadoop namenode recovery

Is there a standard way to prevent the failure of Namenode crash in a
Hadoop cluster?
or what is the standard or best practice for overcoming the Single point
failure problem of Hadoop.

I am not ready to take chances on a production server with Hadoop 2.0 Alpha
release, which claims to have solved the problem. Are there any other
things I can do to either prevent the failure or recover from the failure
in a very short time.

Thanking You,

Ouch Whisper
bejoy.hadoop@... 2013-01-15, 02:50
Panshul Whisper 2013-01-15, 03:48