At a first glance I would say that your data size is very small. Flink
is able to process millions of records on a single machine. It might be
that the records are produced to quickly to be used for latency measuring.
Is you data generator never-ending?
Am 11/22/17 um 4:13 PM schrieb Ladhari Sadok:
Thanks Timo for your answer.
I have tried to setLatencyTrackingInterval(1000) but I have got the
same result ( latency : NaN )
My Flink Job is a geofencing pattern :
* [Latitude,Langitude ] < IN | OUT > Location ? Send Notification : None
In my stress test I'm using data that always send notifications
(condition always matched). So I want to measure the latency of my
implementation.
I'm working with parallelism of 8 , all tasks are working and
notifications are correctly generated but when testing I have noticed
that the latency metric don't work (take a look at the screen-shot in
attach). All other metrics are working.
Please help me finding the best way to do the stress testing correctly.
Regards,
Sadok
2017-11-22 14:52 GMT+01:00 Timo Walther <twal...@apache.org
<mailto:twal...@apache.org>>:
Hi Sadok,
it would be helpful if you could tell us a bit more about your
job. E.g. a skewed key distribution where keys are only sent to
one third of your operators can not use your CPUs full capabilities.
The latency tracking interval is in milliseconds. Can you try if
1000 would fix your problem? I could not find an open issue
describing your problem. Maybe more information about your
environment can help. How are you executing your Flink
application? Are you using a parallelism of 8?
Regards,
Timo
Am 11/22/17 um 9:49 AM schrieb Ladhari Sadok:
Hi All,
I want to do a stress testing of my Flink app implementation:
event generation with ParallelSourceFunction then measuring the
latency ,throughput, CPU & memry leak ...
But when testing, I noticed that :
* the maximum of CPU usage is 30-33%
* latency is always NaNd NaNh in the dashboard ( even I have
set this configuration
executionConfig.setLatencyTrackingInterval(1); )
Can some one help me find the best solution to smoke testing Flink ?
Note: I'm using Flink 1.3 and the Flink Web UI to visualize the
metrics.
Also my PC have a 12Go RAM and 8 Core CPU.
Regards,
Sadok
