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https://issues.apache.org/jira/browse/HDFS-14904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao resolved HDFS-14904.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
> Add Option to let Balancer prefer highly utilized nodes in each iteration
> -------------------------------------------------------------------------
>
> Key: HDFS-14904
> URL: https://issues.apache.org/jira/browse/HDFS-14904
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Reporter: Leon Gao
> Assignee: Leon Gao
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> Normally the most important purpose for HDFS balancer is to reduce the top
> used node to prevent datanode usage from being too high.
> Currently, balancer almost randomly picks nodes as sources regardless of
> usage, which makes it slow to bring down the top used datanodes in the
> cluster, when there are less underutilized nodes in the cluster (consider
> expansion).
> We can add an option to prefer top used nodes first in each iteration, as
> suggested in HDFS-14894 .
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