Jianwei Cui created HBASE-15327:
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Summary: 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
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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