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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?
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?
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB