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https://issues.apache.org/jira/browse/NIFI-7266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061167#comment-17061167
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Joe Witt commented on NIFI-7266:
--------------------------------

These are extremely old versions of NiFi here and very limited information on 
the flow/configuration details.  Hard to respond meaningfully.  Seeing a sudden 
drop in performance could be related to iops throttling.  Could be related to 
heap being close to full (which really depends on flow specifics as to whether 
that should happen). Or other items.  Would require a lot more 
details/logs/etc.. to have a chance to be helpful.

> NIFI 1.4.0 gets unresponsive after heavy load
> ---------------------------------------------
>
>                 Key: NIFI-7266
>                 URL: https://issues.apache.org/jira/browse/NIFI-7266
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Configuration
>    Affects Versions: 1.2.0, 1.3.0, 1.4.0
>            Reporter: Manuel Loayza
>            Priority: Trivial
>         Attachments: Screen Shot 2020-03-17 at 3.18.27 PM.png
>
>
> We have 2 clusters (6 instances each one) running with NIFI 1.1.2 + JDK 8u121 
> + Linux CentOS
> The traffic get divided between those 2 clusters:
> 1. TPS: 2700 - EAST cluster
> 2. TPS: 980. - WEST cluster
> We have tried to migrate to NIFI 1.2.0, 1.3.0, and 1.4.0, but the cluster 
> with higher TPS (EAST) got stuck after 4 hours of intensive traffic. Also it 
> web console got unresponsive.
> I've tried many things to fix this thing, but only thing I got was to 
> increase the time from 4 to 6 hours before it fails
> Our current instances are running on AWS and each EC2 instances has 8 cpus 
> (c5.2xlarge), and 16GB RAM.
> I've tried to use  c5.4xlarge (it doubles the cpu and ram), but I got the 
> same outcome.
> I don't have a clue to figure it out what the issue is.  Also I have a 
> datadog dashboard to track some java head metrics but everything looks normal.
> What should I do to find why those new better instances are failing? is it 
> memory or disk space or threads got stuck? Why an old NIFI  cluster conf 
> works better than a new NIFI?
> Hope you can help me with this. 
> Thanks
>  



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