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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14309) Allow load balancer to operate when there is region in transition by adding force flag
Date Sat, 29 Aug 2015 09:32:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14721032#comment-14721032
] 

Hadoop QA commented on HBASE-14309:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12753130/14309-v7-branch-1.txt
  against branch-1 branch at commit 4256128fa248b31c0482bdfc2510011771f84037.
  ATTACHMENT ID: 12753130

    {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:red}-1 javac{color}.  The patch appears to cause mvn compile goal to fail with
Hadoop version 2.4.0.

    Compilation errors resume:
    [ERROR] Error invoking method 'get(java.lang.Integer)' in java.util.ArrayList at META-INF/LICENSE.vm[line
1619, column 22]
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process
(default) on project hbase-assembly: Error rendering velocity resource. Error invoking method
'get(java.lang.Integer)' in java.util.ArrayList at META-INF/LICENSE.vm[line 1619, column 22]:
InvocationTargetException: Index: 0, Size: 0 -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following
articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :hbase-assembly
    

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/15323//console

This message is automatically generated.

> Allow load balancer to operate when there is region in transition by adding force flag
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-14309
>                 URL: https://issues.apache.org/jira/browse/HBASE-14309
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: 14309-branch-1.1.txt, 14309-v1.txt, 14309-v2.txt, 14309-v3.txt,
14309-v4.txt, 14309-v5-branch-1.txt, 14309-v5.txt, 14309-v5.txt, 14309-v6.txt, 14309-v7-branch-1.txt,
14309-v7.txt
>
>
> This issue adds boolean parameter, force, to 'balancer' command so that admin can force
region balancing even when there is region in transition - assuming RIT being transient.
> This enhancement was requested by some customer.
> The assumption of this change is that the operator has run hbck and has a reasonable
idea why regions are stuck in transition before using the force flag.
> There was a recent event at the customer where a cluster ended up with a small number
of regionservers hosting most of the regions on the cluster (one regionserver had 50% of the
roughly 20,000 regions). The balancer couldn't be run due to the small number of regions that
were stuck in transition. The admin ended up killing the regionservers so that reassignment
would yield a more equitable distribution of the regions.
> On a different cluster, there was a single store file that had corrupt HDFS blocks (the
SSDs on the cluster were known to lose data). However, since this single region (out of 10s
of 1000s of regions on this cluster) was stuck in transition, the balancer couldn't run.
> While the state keeping in HBase isn't so good yet that the admin can kick off the balancer
automatically in such scenarios knowing when it is safe to do so and when it is not, having
this option available for the operator to use as he / she sees fit seems prudent.



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