Storm Management and Maintenance - Real-time Analytics with Storm and Cassandra - page 202

ing the corresponding worker log. The scenario of nimbus and worker node failures has
been covered in Chapter 4 , Storm in a Clustered Mode .
Now let's imagine a scenario. I am a developer whose topology is not behaving as expec-
ted, and I doubt that one of the bolts is not functioning as expected. So we need to debug
the worker logs and find the root cause. Now we need to find out which worker log to
look at out of multiple supervisors and numerous worker logs; we'll get this information
from the Storm UI. Perform the following steps:
1. Open Storm UI and click on the troublesome topology.
2. Click on the suspected bolt or spout of the topology. A screen analogous to what
is shown in this screenshot should appear:
Here is the clue to debug what's happening in this bolt; I will look into Supervisor5
and Supervisor6 , of worker-6705.log on supervisor5 and supervisor6 .