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https://issues.apache.org/jira/browse/HDFS-14675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16895096#comment-16895096
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Chen Zhang commented on HDFS-14675:
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+1, the default config is too slow for large clusters.
On our production cluster(5k+ nodes), we use 100 for concurrent moves and
50MB/s for the bandwidth, it works very well with a long-running Balancer
service
> Increase Balancer Defaults Further
> ----------------------------------
>
> Key: HDFS-14675
> URL: https://issues.apache.org/jira/browse/HDFS-14675
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Affects Versions: 3.3.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
>
> HDFS-10297 increased the balancer defaults to 50 for
> dfs.datanode.balance.max.concurrent.moves and to 10MB/s for
> dfs.datanode.balance.bandwidthPerSec.
> We have found that these settings often have to be increased further as users
> find the balancer operates too slowly with 50 and 10MB/s. We often recommend
> moving concurrent moves to between 200 and 300 and setting the bandwidth to
> 100 or even 1000MB/s, and these settings seem to work well in practice.
> I would like to suggest we increase the balancer defaults further. I would
> suggest 100 for concurrent moves and 100MB/s for the bandwidth, but I would
> like to know what others think on this topic too.
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