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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14643) Avoid Splits from once again opening a closed reader for fetching the first and last key
Date Tue, 20 Oct 2015 07:31:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964702#comment-14964702
] 

Hadoop QA commented on HBASE-14643:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12767531/HBASE-14643_v3.patch
  against master branch at commit c1f0442045f44fcbb3935f9244794929a5d0caea.
  ATTACHMENT ID: 12767531

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

    {color:green}+1 tests included{color}.  The patch appears to include 4 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:red}-1 checkstyle{color}.  The applied patch generated 1748 checkstyle
errors (more than the master's current 1747 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/16108//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/16108//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/16108//artifact/patchprocess/checkstyle-aggregate.html

                Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/16108//console

This message is automatically generated.

> Avoid Splits from once again opening a closed reader for fetching the first and last
key
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-14643
>                 URL: https://issues.apache.org/jira/browse/HBASE-14643
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: Heng Chen
>         Attachments: HBASE-14643.patch, HBASE-14643_v1.patch, HBASE-14643_v2.patch, HBASE-14643_v3.patch,
HBASE-14643_v4.patch
>
>
> Currently split flow is such that we close the parent region and all its store file readers
are also closed.  After that inorder to split the reference files we need the first and last
keys for which once again open the readers on those store files.  This could be costlier operation
considering the fact that it has to contact the HDFS for this close and open operation. This
JIRA is to see if we can improve this.



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