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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3433) Remove the KV copy of every KV in Scan; introduced by HBASE-3232 (why doesn't keyonlyfilter make copies rather than mutate -- HBASE-3211)?
Date Sat, 12 Nov 2011 04:12:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148983#comment-13148983
] 

Hudson commented on HBASE-3433:
-------------------------------

Integrated in HBase-TRUNK #2430 (See [https://builds.apache.org/job/HBase-TRUNK/2430/])
    HBASE-3433  Remove the KV copy of every KV in Scan; introduced by HBASE-3232

larsh : 
Files : 
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/KeyValue.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/Filter.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/FilterBase.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/FilterList.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/KeyOnlyFilter.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/SkipFilter.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/filter/WhileMatchFilter.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java

                
> Remove the KV copy of every KV in Scan; introduced by HBASE-3232 (why doesn't keyonlyfilter
make copies rather than mutate -- HBASE-3211)?
> ------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3433
>                 URL: https://issues.apache.org/jira/browse/HBASE-3433
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance, regionserver
>            Reporter: stack
>            Assignee: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.92.0, 0.94.0
>
>         Attachments: 3433-v2.txt, 3433-v3.txt, 3433.txt, HBASE-3433-sidenote.patch
>
>
> Here is offending code from inside in StoreScanner#next:
> {code}
>       // kv is no longer immutable due to KeyOnlyFilter! use copy for safety
>       KeyValue copyKv = new KeyValue(kv.getBuffer(), kv.getOffset(), kv.getLength());
> {code}
> This looks wrong given philosophy up to this has been avoidance of garbage-making copies.
> Maybe this has been looked into before and this is the only thing to be done but why
is KeyOnlyFilter not making copies rather than mutating originals?
> Making this critical against 0.92.

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