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From "stack (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 Fri, 11 Nov 2011 17:43:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148603#comment-13148603
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stack commented on HBASE-3433:
------------------------------

+1 on commit.  Some minors below that can be addressed on commit.  We can't add this to 0.92?

Does the below have to be public rather than package private?

{code}
+  public Filter getFilter() {
{code}

I like your transform addition to the Filter Interface.

I think you need to say a little more in Filter#transform javadoc; you should say that the
transform is what is actually returned to the client and perhaps point at keyonlyfilter as
example usage.  Filters are hard.  Poor fellas trying to make sense of them need all the pointers
possible.

                
> 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: 0.94.0
>
>         Attachments: 3433-v2.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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