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https://issues.apache.org/jira/browse/HBASE-24152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105888#comment-17105888
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Zheng Wang commented on HBASE-24152:
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{quote}Thanks. So, one replica goes to SSD and you want the RS w/ that replica
to be favored over the others?
{quote}
Yeah.
{quote}Please explain why we need to carry around a dedicated weight just for
this ONE_SSD placement policy; why we can't just use the existing measure?
{quote}
To be exact, this new added weight is for ssd storage type, both ONE_SSD and
ALL_SSD storage policy ralated to it.
The existing weight dose not care about storage type, so we could not reach the
goal that you above-mentioned by it.
> 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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