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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14826) Small improvement in KVHeap seek() API
Date Tue, 17 Nov 2015 15:27:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15008829#comment-15008829
] 

Hadoop QA commented on HBASE-14826:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12772726/HBASE-14826.patch
  against master branch at commit db42fc64f1e54ab8b47799eae7920f7298a5a406.
  ATTACHMENT ID: 12772726

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {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/16550//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/16550//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/16550//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/16550//console

This message is automatically generated.

> Small improvement in KVHeap seek() API
> --------------------------------------
>
>                 Key: HBASE-14826
>                 URL: https://issues.apache.org/jira/browse/HBASE-14826
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>         Attachments: HBASE-14826.patch
>
>
> Currently in seek/reseek() APIs we tend to do lot of priorityqueue related operations.
We initially add the current scanner to the heap, then poll and again add the scanner back
if the seekKey is greater than the topkey in that scanner. Since the KVs are always going
to be in increasing order and in ideal scan flow every seek/reseek is followed by a next()
call it should be ok if we start with checking the current scanner and then do a poll to get
the next scanner. Just avoid the initial PQ.add(current) call. This could save some comparisons.




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