[ https://issues.apache.org/jira/browse/HDFS-1431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Scott Chen updated HDFS-1431: ----------------------------- Attachment: HDFS-1431.txt > Balancer should work with the logic of BlockPlacementPolicy > ----------------------------------------------------------- > > Key: HDFS-1431 > URL: https://issues.apache.org/jira/browse/HDFS-1431 > Project: Hadoop HDFS > Issue Type: Improvement > Components: balancer > Affects Versions: 0.22.0 > Reporter: Scott Chen > Assignee: Scott Chen > Fix For: 0.22.0 > > > Currently Balancer does not obtain information from BlockPlacementPolicy so > it can transfer the blocks without checking with BlockPlacementPolicy. > This causes the policy break after balancing the cluster. > There are some new policies proposed in HDFS-1094 and MAPREDUCE-1831 in which > the block placement follows some pattern. > The pattern can be broken by Balancer. > I propose that we add the following method in BlockPlacementPolicy: > {code} > abstract public boolean canBeMoved(String fileName, Block block, > DatanodeInfo source, DatanodeInfo destination); > {code} > And make Balancer use it in > {code} > private boolean isGoodBlockCandidate(Source source, > BalancerDatanode target, BalancerBlock block) > {code} > What do you think? -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.