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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7279) Avoid copying the rowkey in RegionScanner, StoreScanner, and ScanQueryMatcher
Date Wed, 05 Dec 2012 04:29:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510266#comment-13510266
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stack commented on HBASE-7279:
------------------------------

I don't care about whether it pretty or not.  Its fine writing a bit more code for some savings.
 How you think we test more if we are losing out by removing the row and ts caches?

Patch looks good.

Could peeked change under you while you do the below?  Or is it single thread only in here?

+    byte[] row = peeked.getBuffer();
+    int offset = peeked.getRowOffset();
+    short length = peeked.getRowLength();
                
> Avoid copying the rowkey in RegionScanner, StoreScanner, and ScanQueryMatcher
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-7279
>                 URL: https://issues.apache.org/jira/browse/HBASE-7279
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.4
>
>         Attachments: 7279-0.94.txt
>
>
> Did some profiling again.
> I we can gain some performance [1] when passing buffer, rowoffset, and rowlength instead
of making a copy of the row key.
> That way we can also remove the row key caching (and this patch also removes the timestamps
caching). Considering the sheer number in which we create KVs, every byte save is good.
> [1] (15-20% when data is in the block cache we setup a Filter such that only a single
row is returned to the client).

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