(I'm sorry, I meant to say that I read that the Java Flight Recorder is
now available for unlicensed--in the original Oracle sense--for use.)
On 8/2/21 12:44 PM, Russell Bateman wrote:
Scott,
I believe I read somewhere in the last year. I found this:
https://developers.redhat.com/blog/2020/08/25/get-started-with-jdk-flight-recorder-in-openjdk-8u
And, I used it to look into a problem I had with Apache NiFi a few
years ago. For what it's worth, my experience is recorded here:
https://www.javahotchocolate.com/notes/jfr.html
Hope some of this helps.
Russ
On 8/2/21 12:20 PM, scott wrote:
I'm using openjdk-11.0.7.10-4 as I was on the previous version of
NiFi. I'll look around for a free Java profiler to use to dig deeper.
Thanks,
Scott
On Sat, Jul 31, 2021 at 7:56 PM Joe Witt <[email protected]
<mailto:[email protected]>> wrote:
Scott
Nope this sounds pretty dang unique
What JVM? May need to attach a profiler.
I have seen buried exceptions happening at massive rates causing
horrid performance among a few other scenarios but nothing
specific to 1.14
thanks
On Sat, Jul 31, 2021 at 4:01 PM scott <[email protected]
<mailto:[email protected]>> wrote:
Hi All,
I upgraded to 1.14 last week and within a few days I started
to see some pretty odd behavior, I'm hoping someone has
either seen it before or could point me to a deeper level of
troubleshooting.
Here are the symptoms I observed.
* Performance issues:
Processor performance very poor. Even simple processors
like router and updateattribute went from being able to
process 100,000recs/min to 100recs/min or stop all together,
but not consistently.
Processors needing to be force killed, even simple ones
like updateattribute.
* Weirdness. One of my routers lost its mind and
didn't recognize the routes configured anymore. It changed
all the arrows to dotted lines except for the default. I
ended up copying it and replacing it with the copy, no
changes mind you, but it worked fine.
* Errors: I have not found any obvious errors in the nifi
logs that could explain this, but one error keeps repeating
in the logs: SQLServerDriver is not found . I have dozens of
processors that use SQL Server, all seem to be working fine.
This is not tied to a particular processor's configuration. I
don't think this is related.
* Server resources fine. I use htop and sar to troubleshoot
hardware issues usually, all looks normal. I added 1/3 more
memory to the JVM, now at 24GB, just for good measure, but
that had no effect.
Is it possible there are some hidden performance issues going
on within the JVM I need a special tool to see?
Any help would be greatly appreciated.
Thanks,
Scott
