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From Kihwal Lee <kih...@yahoo-inc.com>
Subject Re: what is different between CorruptBlocks and MissingBlocks in NN FSNamesystem metrics?
Date Mon, 18 Nov 2013 15:48:57 GMT
Missing blocks are the blocks with no valid replicas. I.e. data is not available. Corrupt blocks
are the ones with at least one corrupt replica. They may have healthy live replicas that are
not corrupt, which can be read by users or replicated by the system to replace the corrupt
replicas.  "Missing blocks" is a subset of "Corrupt blocks".

Kihwal 



On Monday, November 18, 2013 3:07 AM, ch huang <justlooks@gmail.com> wrote:
 
hi,all:

          CorruptBlocks  is "Number of blocks with corrupt replicas" ,but
the MissingBlocks is also from
this.neededReplications.getCorruptBlockSize() ,any difference?
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