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https://issues.apache.org/jira/browse/HBASE-10263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13859527#comment-13859527
 ] 

Hadoop QA commented on HBASE-10263:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  
http://issues.apache.org/jira/secure/attachment/12620929/HBASE-10263-trunk_v0.patch
  against trunk revision .
  ATTACHMENT ID: 12620929

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new 
or modified tests.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 
1.0 profile.

    {color:green}+1 hadoop1.1{color}.  The patch compiles against the hadoop 
1.1 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any 
warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 1 new 
Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines 
longer than 100

    {color:red}-1 site{color}.  The patch appears to cause mvn site goal to 
fail.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.master.TestSplitLogManager

Test results: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/8310//console

This message is automatically generated.

> make LruBlockCache single/multi/in-memory ratio user-configurable and provide 
> preemptive mode for in-memory type block
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-10263
>                 URL: https://issues.apache.org/jira/browse/HBASE-10263
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Feng Honghua
>            Assignee: Feng Honghua
>         Attachments: HBASE-10263-trunk_v0.patch
>
>
> currently the single/multi/in-memory ratio in LruBlockCache is hardcoded 
> 1:2:1, which can lead to somewhat counter-intuition behavior for some user 
> scenario where in-memory table's read performance is much worse than ordinary 
> table when two tables' data size is almost equal and larger than 
> regionserver's cache size (we ever did some such experiment and verified that 
> in-memory table random read performance is two times worse than ordinary 
> table).
> this patch fixes above issue and provides:
> 1. make single/multi/in-memory ratio user-configurable
> 2. provide a configurable switch which can make in-memory block preemptive, 
> by preemptive means when this switch is on in-memory block can kick out any 
> ordinary block to make room until no ordinary block, when this switch is off 
> (by default) the behavior is the same as previous, using 
> single/multi/in-memory ratio to determine evicting.
> by default, above two changes are both off and the behavior keeps the same as 
> before applying this patch. it's client/user's choice to determine whether or 
> which behavior to use by enabling one of these two enhancements.



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