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https://issues.apache.org/jira/browse/HBASE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991290#comment-12991290
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Lars George commented on HBASE-74:
----------------------------------
Stack,
{quote}
> HStore : Every read from memCache + storefiles can be done in parallel.
{quote}
How is that going to work with the ScanQueryMatcher? I mean, the initial seek()
I can understand, but then you have to scan the stores by age starting with the
MemStore, moving to the on-disk Stores. How can we parallelize that? Just
curious.
> [performance] When a get or scan request spans multiple columns, execute the
> reads in parallel
> ----------------------------------------------------------------------------------------------
>
> Key: HBASE-74
> URL: https://issues.apache.org/jira/browse/HBASE-74
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Jim Kellerman
> Priority: Critical
> Fix For: 0.92.0
>
>
> When a get or scan request spans multiple columns, execute the reads in
> parallel and use a CountDownLatch to wait for them to complete before
> returning the results.
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