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https://issues.apache.org/jira/browse/HBASE-21014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573153#comment-16573153
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Hari Sekhon commented on HBASE-21014:
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I thought that was the whole point of the FavoredNodeLoadBalancer - so that
HBase Balancer can write those HDFS hints based on the knowledge it has of
region locations so that HDFS Balancer does not move them and lose data
locality?
> Improve Stochastic Balancer to write HDFS favoured node hints for region
> primary blocks to avoid destroying data locality if needing to use HDFS
> Balancer
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-21014
> URL: https://issues.apache.org/jira/browse/HBASE-21014
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Affects Versions: 1.1.2
> Reporter: Hari Sekhon
> Priority: Major
>
> Improve Stochastic Balancer to include the HDFS region location hints to
> avoid HDFS Balancer destroying data locality.
> Right now according to a mix of docs, jiras and mailing list info it appears
> that one must change
> {code:java}
> hbase.master.loadbalancer.class{code}
> to the org.apache.hadoop.hbase.favored.FavoredNodeLoadBalancer as it looks
> like this functionality is only within FavoredNodeBalancer and not the
> standard Stochastic Balancer.
> [http://hbase.apache.org/book.html#_hbase_and_hdfs]
> This is not ideal because we'd still like to use all the heuristics and work
> that has gone in the Stochastic Balancer which I believe right now is the
> best and most mature HBase balancer.
> See also the linked Jiras and this discussion:
> [http://apache-hbase.679495.n3.nabble.com/HDFS-Balancer-td4086607.html]
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