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From "Srikanth Upputuri (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7082) When replication factor equals number of data nodes, corrupt replica will never get substituted with good replica
Date Wed, 17 Sep 2014 10:34:34 GMT
Srikanth Upputuri created HDFS-7082:
---------------------------------------

             Summary: When replication factor equals number of data nodes, corrupt replica
will never get substituted with good replica
                 Key: HDFS-7082
                 URL: https://issues.apache.org/jira/browse/HDFS-7082
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Srikanth Upputuri
            Assignee: Srikanth Upputuri
            Priority: Minor


BlockManager will not invalidate a corrupt replica if this brings down the total number of
replicas below replication factor (except if the corrupt replica has a wrong genstamp). On
clusters where the replication factor = total data nodes, a new replica can not be created
from a live replica as all the available datanodes already have a replica each. Because of
this, the corrupt replicas will never be substituted with good replicas, so will never get
deleted. Sooner or later all replicas may get corrupt and there will be no live replicas in
the cluster for this block.




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