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https://issues.apache.org/jira/browse/HDFS-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207475#comment-14207475
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Tsz Wo Nicholas Sze commented on HDFS-1681:
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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.
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