Increase the request handler thread count
If you are an administator and your cluster needs to handle high volume of request patterns, increase the number of listeners generated by the RegionServers.
In the
hbase-site.xmlconfiguration file, increase the
hbase.regionserver.handler.count property higher than the
default value. The default value is 30.
<property>
<name>hbase.regionserver.handler.count</name>
<value>30</value>
</property>