Josef Zahner created NIFI-4905:

             Summary: Cluster response time is slow
                 Key: NIFI-4905
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core UI
    Affects Versions: 1.5.0
         Environment: Centos 7.3
NiFi 1.5.0 Cluster with 8 physical nodes
            Reporter: Josef Zahner
         Attachments: cpu_load_nifi.PNG, root_canvas.png

we are actually working on a PoC with 8 nodes (HP BL460c Blades, 24 Cores, 44GB 
RAM) in a NiFi 1.5.0 cluster. Our configuration has about 160 processors and 
all of them are stopped. Even in the stopped state, we are constantly getting 
the messages below for all nodes, not only for the primary node.
Response time from was slow for each of the last 3 
requests made. To see more information about timing, enable DEBUG logging for 
If you are on the root canvas, you feel that it takes a few seconds until it 
response after a refresh. We have already tuned the parameters below, but 
without any luck. After restart of NiFi it is fine for a few minutes, but then 
the messages return.
nifi.cluster.protocol.heartbeat.interval=15 sec
nifi.cluster.node.connection.timeout=60 sec sec
The nodes have absolute no load beside of NiFi. What surprised me was, that 
when the UI refreshs (default every 30s) it produces about 20% cpu load on my 
machine. And remember, it's a 24x2.9GHz blade server.


That's a picture of my root canvas:


Actually we can't work with the cluster under this circumstances because the 
gui always gets so slow.

Is this a bug or normal behavior? Do we have to much elements on the GUI or 
what could cause this issue?



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