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Date: Sat, 17 Oct 2015 02:32:05 +0000 (UTC)
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Subject: [jira] [Commented] (HBASE-14496) Compaction improvements: Delayed
 compaction in RatioBasedCompactionPolicy
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    [ https://issues.apache.org/jira/browse/HBASE-14496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961673#comment-14961673 ] 

Hadoop QA commented on HBASE-14496:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12767143/HBASE-14496.v2.patch
  against master branch at commit 6774f223a4a1cfd3cd81a17861ac94faad3b2916.
  ATTACHMENT ID: 12767143

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

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions (2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.6.1 2.7.0 2.7.1)

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

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

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

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new Findbugs (version 2.0.3) 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:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/16072//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/16072//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/16072//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/16072//console

This message is automatically generated.

> Compaction improvements: Delayed compaction in RatioBasedCompactionPolicy
> -------------------------------------------------------------------------
>
>                 Key: HBASE-14496
>                 URL: https://issues.apache.org/jira/browse/HBASE-14496
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>         Attachments: HBASE-14496.v1.patch, HBASE-14496.v2.patch
>
>
> Delayed compaction feature for RatioBasedCompactionPolicy allows to specify maximum compaction delay for newly created store files. Files will be eligible for compaction only if their age exceeds this delay. This will allow to preserve new data in a block cache. For most applications, the newer the data is the more frequently it is accessed. The frequent compactions of a new store files result in high block cache churn rate and affects read performance and read latencies badly. 
> The configuration will be global, per table, per column family.


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