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From "Michael Moser (JIRA)" <>
Subject [jira] [Commented] (NIFI-1515) Large numbers of processors can cause stats to exhaust heap
Date Tue, 16 Feb 2016 20:48:18 GMT


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:
>             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 []
> Sent: Monday, February 15, 2016 10:32 AM
> To:
> 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 <> 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]
> > 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 that looked related.
> >
> > Thanks,
> > Joe
> {quote}

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