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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14575) Relax region read lock for compactions
Date Wed, 18 Nov 2015 21:13:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011976#comment-15011976
] 

Hadoop QA commented on HBASE-14575:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12773040/14575-v7.txt
  against master branch at commit b2187c31ab8294215aab46db5dcd3b0dce4fad65.
  ATTACHMENT ID: 12773040

    {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 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/16572//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/16572//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/16572//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/16572//console

This message is automatically generated.

> Relax region read lock for compactions
> --------------------------------------
>
>                 Key: HBASE-14575
>                 URL: https://issues.apache.org/jira/browse/HBASE-14575
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction, regionserver
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>         Attachments: 14575-test-case.patch, 14575-v1.patch, 14575-v2.patch, 14575-v3.patch,
14575-v4.patch, 14575-v5.patch, 14575-v6.txt, 14575-v6.txt, 14575-v6.txt, 14575-v7.txt, 14575.v00.patch
>
>
> Per [~devaraj]'s idea on parent issue, let's see if we can reduce the scope of critical
section under which compactions hold the region read lock.
> Here is summary from parent issue:
> Another idea is we can reduce the scope of when the read lock is held during compaction.
In theory the compactor only needs a region read lock while deciding what files to compact
and at the time of committing the compaction. We're protected from the case of region close
events because compactions are checking (every 10k bytes written) if the store has been closed
in order to abort in such a case.



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