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https://issues.apache.org/jira/browse/HBASE-15327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-15327:
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Attachment: HBASE-15327-trunk.patch
Previous test output is no longer accessible.
Re-attach.
> 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
> Priority: Minor
> Attachments: HBASE-15327-trunk.patch, HBASE-15327-trunk.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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