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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1938) Make in-memory table scanning faster
Date Wed, 27 Jul 2011 22:17:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072057#comment-13072057
] 

Andrew Purtell commented on HBASE-1938:
---------------------------------------

I ran 3 consecutive tests with MemStore changes applied, or not. Then after seeing results
I did not expect -- longer run times for both loading and scanning with the MemStore changes
applied and higher per-op latencies (e.g. 38 ms vs 44 ms) -- I ran another set of 5 runs.
The results of all but one were consistent. This was not a rigorous test I suppose, I didn't
try it on another server, because I was already skeptical of the wisdom of changing how the
read point is done on branch.

> Make in-memory table scanning faster
> ------------------------------------
>
>                 Key: HBASE-1938
>                 URL: https://issues.apache.org/jira/browse/HBASE-1938
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance
>            Reporter: stack
>            Assignee: nkeywal
>            Priority: Blocker
>             Fix For: 0.90.4, 0.92.0
>
>         Attachments: 20110726_1938_KeyValueSkipListSet.patch, 20110726_1938_MemStore.patch,
20110726_1938_MemStoreScanPerformance.java, MemStoreScanPerformance.java, MemStoreScanPerformance.java,
caching-keylength-in-kv.patch, test.patch
>
>
> This issue is about profiling hbase to see if I can make hbase scans run faster when
all is up in memory.  Talking to some users, they are seeing about 1/4 million rows a second.
 It should be able to go faster than this (Scanning an array of objects, they can do about
4-5x this).

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