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https://issues.apache.org/jira/browse/BOOKKEEPER-592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671347#comment-13671347
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Hadoop QA commented on BOOKKEEPER-592:
--------------------------------------

Testing JIRA BOOKKEEPER-592


Patch 
[bookkeeper-592.patch|https://issues.apache.org/jira/secure/attachment/12585579/bookkeeper-592.patch]
 downloaded at Fri May 31 10:51:07 UTC 2013

----------------------------

{color:green}+1 PATCH_APPLIES{color}
{color:green}+1 CLEAN{color}
{color:red}-1 RAW_PATCH_ANALYSIS{color}
.    {color:green}+1{color} the patch does not introduce any @author tags
.    {color:green}+1{color} the patch does not introduce any tabs
.    {color:red}-1{color} the patch contains 1 line(s) with trailing spaces
.    {color:red}-1{color} the patch contains 2 line(s) longer than 120 
characters
.    {color:green}+1{color} the patch does adds/modifies 3 testcase(s)
{color:green}+1 RAT{color}
.    {color:green}+1{color} the patch does not seem to introduce new RAT 
warnings
{color:green}+1 JAVADOC{color}
.    {color:green}+1{color} the patch does not seem to introduce new Javadoc 
warnings
{color:green}+1 COMPILE{color}
.    {color:green}+1{color} HEAD compiles
.    {color:green}+1{color} patch compiles
.    {color:green}+1{color} the patch does not seem to introduce new javac 
warnings
{color:green}+1 FINDBUGS{color}
.    {color:green}+1{color} the patch does not seem to introduce new Findbugs 
warnings
{color:green}+1 TESTS{color}
.    Tests run: 848
{color:green}+1 DISTRO{color}
.    {color:green}+1{color} distro tarball builds with the patch 

----------------------------
{color:red}*-1 Overall result, please check the reported -1(s)*{color}


The full output of the test-patch run is available at

.   https://builds.apache.org/job/bookkeeper-trunk-precommit-build/348/
                
> allow application to recommend ledger data locality
> ---------------------------------------------------
>
>                 Key: BOOKKEEPER-592
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-592
>             Project: Bookkeeper
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Sijie Guo
>             Fix For: 4.3.0
>
>         Attachments: bookkeeper-592.patch, BOOKKEEPER-592.patch, 
> BOOKKEEPER-592.patch, BOOKKEEPER-592.patch
>
>
> For application like hbase WAL, it will be useful if application like hbase 
> can give a hint to bk about application's preferred ledger location. In that 
> way, application can fail over to specific machines where one of the ledger 
> replica is located; the recovery time will be faster. Another scenario is 
> hbase's support for hot standby region server where read request can be 
> served from a different machine other than the active region server. That 
> requires the hot standby region server to read from ledger. If the ledger is 
> on the same machine as standby region server, the performance will be better.

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