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https://issues.apache.org/jira/browse/HDFS-7082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-7082 started by Srikanth Upputuri.
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> 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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