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https://issues.apache.org/jira/browse/HBASE-24152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17104667#comment-17104667
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Zheng Wang commented on HBASE-24152:
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The explain of One_SSD storage policy:
"One_SSD - for storing one of the replicas in SSD. The remaining replicas are
stored in DISK."
Considering the host of replicas is diffrent, and hdfs try to read local
replica first, so my starting point is we should move the region to follow the
replica in ssd, the existing cost functions does not relate to this, so i add a
new one in this issue.
Thanks very much. :)
> Add ServerSsdLocalityCostFunction to StochasticLoadBalancer
> -----------------------------------------------------------
>
> Key: HBASE-24152
> URL: https://issues.apache.org/jira/browse/HBASE-24152
> Project: HBase
> Issue Type: New Feature
> Components: Balancer
> Reporter: Zheng Wang
> Assignee: Zheng Wang
> Priority: Major
>
> When use ONE_SSD storagy policy, or ALL_SSD but has not enough SSD, there
> will be some hdfs blocks on DISK and others on SSD,so it is reasonable to
> consider the locality of ssd for StochasticLoadBalancer.
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