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https://issues.apache.org/jira/browse/HBASE-5033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173371#comment-13173371
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Lars Hofhansl commented on HBASE-5033:
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As a general comment obviously this will only improve latency for a single
request and possibly be detrimental to the aggregate throughput of a
regionserver (because of higher CPU/IO contention). It may also cause problems
with fairness, where a few requests can hog a regionserver.
So as part of this we need to carefully verify that aggregate throughput is not
impacted, and I think the amount of parallelisms needs to be configurable (I
have not looked in detail at the patch, so the configuration might already be
there).
> Opening/Closing store in parallel to reduce region open/close time
> ------------------------------------------------------------------
>
> Key: HBASE-5033
> URL: https://issues.apache.org/jira/browse/HBASE-5033
> Project: HBase
> Issue Type: Improvement
> Reporter: Liyin Tang
> Assignee: Liyin Tang
> Attachments: D933.1.patch, D933.2.patch
>
>
> Region servers are opening/closing each store and each store file for every
> store in sequential fashion, which may cause inefficiency to open/close
> regions.
> So this diff is to open/close each store in parallel in order to reduce
> region open/close time. Also it would help to reduce the cluster restart time.
> 1) Opening each store in parallel
> 2) Loading each store file for every store in parallel
> 3) Closing each store in parallel
> 4) Closing each store file for every store in parallel.
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