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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10993) Deprioritize long-running scanners
Date Fri, 18 Apr 2014 04:10:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973771#comment-13973771
] 

Hadoop QA commented on HBASE-10993:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12640754/HBASE-10993-v1.patch
  against trunk revision .
  ATTACHMENT ID: 12640754

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

    {color:green}+1 tests included{color}.  The patch appears to include 8 new or modified
tests.

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

    {color:red}-1 javac{color}.  The patch appears to cause mvn compile goal to fail.

    {color:red}-1 findbugs{color}.  The patch appears to cause Findbugs (version 1.3.9) to
fail.

    {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:red}-1 site{color}.  The patch appears to cause mvn site goal to fail.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
     

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/9330//testReport/
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/9330//console

This message is automatically generated.

> Deprioritize long-running scanners
> ----------------------------------
>
>                 Key: HBASE-10993
>                 URL: https://issues.apache.org/jira/browse/HBASE-10993
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>            Priority: Minor
>             Fix For: 1.0.0
>
>         Attachments: HBASE-10993-v0.patch, HBASE-10993-v1.patch
>
>
> Currently we have a single call queue that serves all the "normal user"  requests, and
the requests are executed in FIFO.
> When running map-reduce jobs and user-queries on the same machine, we want to prioritize
the user-queries.
> Without changing too much code, and not having the user giving hints, we can add a “vtime”
field to the scanner, to keep track from how long is running. And we can replace the callQueue
with a priorityQueue. In this way we can deprioritize long-running scans, the longer a scan
request lives the less priority it gets.



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