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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17339) Scan-Memory-First Optimization for Get Operation
Date Tue, 27 Dec 2016 14:32:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15780507#comment-15780507
] 

Dave Latham commented on HBASE-17339:
-------------------------------------

Some previous discussion of restrictions on client provided timestamps occurred at HBASE-10247.
In particular, replication support was deemed to be a blocker at the time.

> Scan-Memory-First Optimization for Get Operation
> ------------------------------------------------
>
>                 Key: HBASE-17339
>                 URL: https://issues.apache.org/jira/browse/HBASE-17339
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Eshcar Hillel
>         Attachments: HBASE-17339-V01.patch
>
>
> The current implementation of a get operation (to retrieve values for a specific key)
scans through all relevant stores of the region; for each store both memory components (memstores
segments) and disk components (hfiles) are scanned in parallel.
> We suggest to apply an optimization that speculatively scans memory-only components first
and only if the result is incomplete scans both memory and disk.



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