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Tsz Wo Nicholas Sze commented on HDFS-1681: ------------------------------------------- You are correct, c¯ should be c¯i. For being consistent with the first part, I would re-write the condition as {code} c¯j - t <= b_i,j <= c¯j + t {code} where - b_i,j is the % storage utilization of block pool j in datanode i, - c¯j is the % average storage utilization of block pool j, and - t is the % balancing threshold. > Federation: support per pool and per node policies in Balancer > -------------------------------------------------------------- > > Key: HDFS-1681 > URL: https://issues.apache.org/jira/browse/HDFS-1681 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: balancer & mover > Affects Versions: Federation Branch > Reporter: Tsz Wo Nicholas Sze > Assignee: Tsz Wo Nicholas Sze > Fix For: Federation Branch > > Attachments: 4213426.patch > > > Change balancer to support per pool and per node policies. > *per Node*: Cluster is balance if each node is balance. > *per Pool*: Cluster is balance if each pool is balance. > Note that per Pool implies per Node but NOT the other way around. -- This message was sent by Atlassian JIRA (v6.3.4#6332)