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https://issues.apache.org/jira/browse/HBASE-15327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15218528#comment-15218528
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Hudson commented on HBASE-15327:
--------------------------------
SUCCESS: Integrated in HBase-1.3 #627 (See
[https://builds.apache.org/job/HBase-1.3/627/])
HBASE-15327 Canary will always invoke admin.balancer() in each sniffing (tedyu:
rev 07db39a023ddb76db322cc9694d2c585644594ee)
* hbase-server/src/main/java/org/apache/hadoop/hbase/tool/Canary.java
> Canary will always invoke admin.balancer() in each sniffing period when
> writeSniffing is enabled
> ------------------------------------------------------------------------------------------------
>
> Key: HBASE-15327
> URL: https://issues.apache.org/jira/browse/HBASE-15327
> Project: HBase
> Issue Type: Bug
> Components: canary
> Affects Versions: 2.0.0
> Reporter: Jianwei Cui
> Assignee: Jianwei Cui
> Priority: Minor
> Fix For: 2.0.0, 1.3.0, 1.4.0
>
> Attachments: HBASE-15327-branch-1-v1.patch, HBASE-15327-trunk.patch,
> HBASE-15327-trunk.patch, HBASE-15327-v1.patch
>
>
> When Canary#writeSniffing is enabled, Canary#checkWriteTableDistribution will
> make sure the regions of write table distributed on all region servers as:
> {code}
> int numberOfServers = admin.getClusterStatus().getServers().size();
> ......
> int numberOfCoveredServers = serverSet.size();
> if (numberOfCoveredServers < numberOfServers) {
> admin.balancer();
> }
> {code}
> The master will also work as a regionserver, so that ClusterStatus#getServers
> will contain the master. On the other hand, write table of Canary will not be
> assigned to master, making numberOfCoveredServers always smaller than
> numberOfServers and admin.balancer always be invoked in each sniffing period.
> This may cause frequent region moves. A simple fix is excluding master from
> numberOfServers.
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