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MapReduce, mail # user - how to corrupt a replica of a block by manually?


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how to corrupt a replica of a block by manually?
ch huang 2013-12-12, 01:07
hi,maillist:
        what is the sample way to corrupt a replica of a block ,i opened a
replica data file ,and delete a line,than use fsck ,nothing corrupt,
 should the DN  be restarted?