[jira] [Commented] (HBASE-17339) Scan-Memory-First Optimization for Get Operation

["Edward Bortnikov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-17339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15780064#comment-15780064 ] 

Edward Bortnikov commented on HBASE-17339:
------------------------------------------

Use cases in which this optimization might (and will) be useful:
- Pub-Sub on top of HBase storage.
- Shared counters on top of HBase storage.
- E-commerce - editing and checking out a purchase cart. 

In these cases, the churn is high but the working set is small - can fit in memory. 

> 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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