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Hadoop >> mail # user >> rack awareness and safemode

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rack awareness and safemode

I am going to restart hadoop cluster in order to enable rack-awareness
first time.
Currently we're running 0.20.203 with 500TB of data on 250+ nodes
(without rack-awareness)

I am thinking and afraid that when i start dfs (with rack-awareness
enable) the HDFS will be in safemode for hours
busy with relocating block to comply with rack-awareness.

Anything knob i can dial to prevent that ?

Thanks in advances