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https://issues.apache.org/jira/browse/NIFI-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374375#comment-16374375
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Joseph Witt commented on NIFI-4905:
-----------------------------------

[~jzahner] its ok if you cannot share the flow.xml.

if you could just grep out the lines from the flow.xml.gz that have the 
processor classnames that would be very enough probably.

*however*, remove your custom processors from the flow for now and see if it 
still takes that long to validate the flow.  If it does, then we really need 
that list.  If it doesn't then you know your custom processors have code in 
validate that should not be.

 

Generally speaking, make sure your validate methods do not do anything 
expensive at all.  Do expensive/time consuming things in onTrigger calls via 
lazy-init for example.

> Cluster response time is slow
> -----------------------------
>
>                 Key: NIFI-4905
>                 URL: https://issues.apache.org/jira/browse/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
>            Priority: Major
>         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.
> {code:java}
> Response time from nifi2-07.xyz.ch:8080 was slow for each of the last 3 
> requests made. To see more information about timing, enable DEBUG logging for 
> org.apache.nifi.cluster.coordination.http.replication.ThreadPoolRequestReplicator
> {code}
> 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.
> {code:java}
> nifi.cluster.protocol.heartbeat.interval=15 sec
> nifi.cluster.node.protocol.threads=40
> nifi.cluster.node.protocol.max.threads=80
> nifi.cluster.node.connection.timeout=60 sec
> nifi.cluster.node.read.timeout=60 sec
> {code}
> The nodes have absolutely 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.
> !cpu_load_nifi.PNG!
> That's a picture of my root canvas:
> !root_canvas.png!
> 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 many elements on the GUI or 
> what could cause this issue?
> Cheers
>  



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