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Tsz Wo Nicholas Sze commented on HDFS-8204: ------------------------------------------- My previous comment was for the bug, not the patch. > What's more important, 2 replicas located on 1 DN doesn't match placement > policy. I am confused. Do you actually see 2 replicas stored in 1 DN? Or you only see two replicas *scheduled* to be moved to the same DN? > Mover/Balancer should not schedule two replicas to the same DN > -------------------------------------------------------------- > > Key: HDFS-8204 > URL: https://issues.apache.org/jira/browse/HDFS-8204 > Project: Hadoop HDFS > Issue Type: Bug > Components: balancer & mover > Reporter: Walter Su > Assignee: Walter Su > Attachments: HDFS-8204.001.patch > > > Balancer moves blocks between Datanode(Ver. <2.6 ). > Balancer moves blocks between StorageGroups ( introduced by HDFS-6584) , in > the new version(Ver. >=2.6) . > function > {code} > class DBlock extends Locations<StorageGroup> > DBlock.isLocatedOn(StorageGroup loc) > {code} > is flawed, may causes 2 replicas ends in same node after running balance. -- This message was sent by Atlassian JIRA (v6.3.4#6332)