HI All, minutes ago I got to the origin of the problem, or at least a big part of it. It was in the same direction that Evan indicates.
In my case it was a port pointing to a ProcessGroup which happens to be disabled. I fixed that and now CPU consumption is in between 60% when no data is being processed, and 100% -120% when processing. The diagram has about 200 hundred processors by the way. So I don't know if those ranges can now be considered as normals. Anyway it can operate well now. Still I got more search to do if there is something else I got wrong, and share it if it is worthy. Thank you all for the tips and recommendations. LC From: "Evan Reynolds" <e...@usermind.com> To: "users" <users@nifi.apache.org> Sent: Tuesday, October 15, 2019 5:40:07 PM Subject: Re: High CPU consumption I have found two issues that can cause high CPU when idle (high being about 200% CPU when idle.) I haven’t verified these with 1.9.2, but it doesn’t hurt to tell you. If you are using ports, make sure each input port is connected. If you have a one that isn’t connected, that can bring your CPU to 200% and stay there. If you have any processors that are set to run on the primary node of a cluster, that can also take your CPU to 200%. I know RouteOnAttribute will do that (again, haven’t tested 1.9.2, but it was a problem for me for a bit!) The fix – either don’t run it on the primary node, or else set the run schedule to 5 seconds or something instead of 0. To find out if this is the case – well, this is what I did. It worked, and wasn’t that hard, though isn’t exactly elegant. Back up your flowfile (flow.xml.gz) Stop all your processors and see what your CPU does Start half of them and watch your CPU – basically do a binary search. If your CPU stays reasonable, then whatever group you started is fine. If not, then start stopping things until your CPU becomes reasonable. Eventually you’ll find a processor that spikes your CPU when you start it and then you can figure out what to do about that processor. Record which processor it is and how you altered it to bring CPU down. Repeat, as there may be more than one processor spiking CPU. Stop NiFi and restore your flowfile by copying it back in place – since you were running around stopping things, this just makes sure everything is correctly back to where it should be Then use the list of processors and fixes to make changes. --------------------------------------------------------------- Evan Reynolds [ mailto:e...@usermind.com | e...@usermind.com ] From: Jon Logan <jmlo...@buffalo.edu> Reply-To: "users@nifi.apache.org" <users@nifi.apache.org> Date: Sunday, October 13, 2019 at 6:12 PM To: "users@nifi.apache.org" <users@nifi.apache.org> Subject: Re: High CPU consumption That isn't logback, that lists all jars on your classpath, the first of which happens to be logback. If you send a SIGKILL3 (you can send it in HTOP) it will dump the thread stacks to stdout (probably the bootstrap log)...but that's just for one instant, and may or may not be helpful. On Sun, Oct 13, 2019 at 8:58 PM Luis Carmona < [ mailto:lcarm...@openpartner.cl | lcarm...@openpartner.cl ] > wrote: hi Aldrin, thanks a lot, by now I'm trying to learn how to make the profiling you mentioned. One more question: Is it normal that the father java process has very low consumption while the child process related to logback jar is the one that is eating up all the CPU ? Please take a look at the attached image. Thanks, LC From: "Aldrin Piri" < [ mailto:aldrinp...@gmail.com | aldrinp...@gmail.com ] > To: "users" < [ mailto:users@nifi.apache.org | users@nifi.apache.org ] > Sent: Sunday, October 13, 2019 9:30:47 PM Subject: Re: High CPU consumption Luis, please feel free to give us some information on your flow so we can help you track down problematic areas as well. On Sun, Oct 13, 2019 at 3:56 PM Jon Logan < [ mailto:jmlo...@buffalo.edu | jmlo...@buffalo.edu ] > wrote: BQ_BEGIN You should put a profiler on it to be sure. Just because your processors aren't processing data doesn't mean they are idle though -- many have to poll for new data, especially sources -- ex. connecting to Kafka, etc, will itself consume some CPU. But again, you should attach a profiler before participating in a wild goose chase of performance issues. On Sun, Oct 13, 2019 at 12:20 PM Luis Carmona < [ mailto:lcarm...@openpartner.cl | lcarm...@openpartner.cl ] > wrote: BQ_BEGIN HI, I've struggling to reduce my nifi installation CPU consumption. Even in idle state, all processors running but no data flowing, it is beyond 60% CPU consumption, with peaks of 200%. What I've done so far - Read and followed every instruction/post about tuning NIFI I've found googling. - Verify scheduling is 1s for most consuming processors: http processors, wait/notify, jolt, etc. - Scratch my head... But nothing seems to have a major effect on the issue. Can anyone give me some precise directions or tips about how to solve this please ? Is this the regular situation, I mean this is the minimun NIFI consumption. The server is configure with 4 CPU's, 8 GB RAM - 4 of them dedicated to heap at bootstrap.conf. Thanks in advance. LC BQ_END BQ_END
