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https://issues.apache.org/jira/browse/NIFI-1515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149268#comment-15149268
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Michael Moser commented on NIFI-1515:
-------------------------------------
This is directly related to the component status implementation in
org.apache.nifi.controller.status.history.VolatileComponentStatusRepository.
Previous discussions about this (comments section of NIFI-1085) have raised the
importance of creating a new ComponentStatusRepository implementation choice
that does not use as much heap space (NIFI-468).
> Large numbers of processors can cause stats to exhaust heap
> -----------------------------------------------------------
>
> Key: NIFI-1515
> URL: https://issues.apache.org/jira/browse/NIFI-1515
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.5.0
> Reporter: Aldrin Piri
> Assignee: Aldrin Piri
>
> There have been some OOME issues reported for very large graphs presumably
> tied to the stats held in a clustered environment on the NCM.
> An email exchange of the problem is detailed below:
> {quote}
> -----Original Message-----
> From: Corey Flowers [mailto:[email protected]]
> Sent: Monday, February 15, 2016 10:32 AM
> To: [email protected]
> Subject: EXTERNAL: Re: OutofMemory
> Hey Joseph,
> I have a couple of clusters in the 600-1200 range and they have
> 16-32 GB jvm heap sizes respectfully. Really it depends on what processors
> you are using and your volumes. One thing that may help a little is to
> decrease your number of stored statics in the graph.
> There are two properties in the conf file, one is set to 1440 and the other
> is a time, which is every 1 min. I believe these stats are stored in the heap
> space. Devs correct me if I am wrong. You could lessen the time and amount to
> buy you a little space. I don't think this is a solution, really it is more
> of a band-aide.
> Good luck!
> Sent from my iPhone
> > On Feb 15, 2016, at 9:33 AM, Gresock, Joseph <[email protected]>
> > wrote:
> >
> > Devs,
> >
> > We've been seeing some OutOfMemoryErrors on the NCM of our 10-node cluster
> > recently. The flow has ~600 processors, and the NCM runs on a VM with 8GB
> > RAM. We have 6G allocated to the Nifi JVM on this node.
> >
> > The specific log message we see is:
> >
> > WARN [Process NCM Request-6] org.apache.nifi.io.socket.SocketListener
> > Dispatching socket request encountered exception due to:
> > java.lang.OutOfMemoryError: Java heap space
> >
> > First, I'm hoping there's some advice on how to avoid this in the first
> > place, but barring that, is there a way to configure Nifi to auto-restart
> > the NCM when it gets this error? I seem to remember seeing this in the
> > past, but I couldn't find anything in bootstrap.conf or nifi.properties
> > that looked related.
> >
> > Thanks,
> > Joe
> {quote}
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