{ 8 } Troubleshooting - GemaAlbiach/Bicing-RealTime-Occupancy-estimation GitHub Wiki

UI shows nothing under topology summary and how to stop cluster

To run that topology in cluster mode, you have to provide an argument. Otherwise it runs it in local mode. Take a look at the code to see what I mean. So try this:

/opt/apache-storm-0.9.2-incubating/bin/storm jar bicingtopology-0.0.1-SNAPSHOT.jar storm.ebd.bicingTopology demo

#Not all supervisors appear in Storm UI

Symptoms:

  • Some supervisor processes are missing from the Storm UI

  • List of supervisors in Storm UI changes on refreshes

Solutions:

  • Make sure the supervisor local dirs are independent (e.g., not sharing a local dir over NFS)

  • Try deleting the local dirs for the supervisors and restarting the daemons. Supervisors create a unique id for themselves and store it locally. When that id is copied to other nodes, Storm gets confused.

Only one datanode can run in a multinode Hadoop setup

Solved the problem. I read though the error information

Node 192.168.1.128:50010 is expected to serve this storage

and found that when I copy the set up from one server to another, I also copied the local data dir for HDFS (dfs.data.dir). And this created conflicts. Once I clean the all the data inside the local dfs.data.dir, the DataNode started without any issue.

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