finding active threads for regionserver(HBase)

Question

Is there way to find all active threads to particular regionServer in Hbase? I want to see, what is causing bottleneck to particular node.

Thanks in advance .

Answer 1

On the RegionServer find the Java Processes of interest to you - meaning everything HBase related. The jvm ships a handy utility to do this, called 'jps'. Here is some example output:

jps -l
18863 sun.tools.jps.Jps
2584 /opt/eclipse//plugins/org.eclipse.equinox.launcher_1.3.0.v20140415-2008.jar

Once you have the processes you need, use 'jstack' to get thread dumps.

jstack <pid> >> threaddump.log

Also check the HBase documentations Troubles section if your problem is already known.

For in depth investigation with jstack Eclipse.org has a nice little script for taking jstack snapshots in fixed time intervals. It may be good for investigating deadlocks (just in case this is your assumption).