Flink memory leak

[ÇETİNKAYA EBRU ÇETİNKAYA EBRU]

Hi,
We are using Flink 1.3.1 in production, we have one job manager and 3 
task managers in standalone mode. Recently, we've noticed that we have 
memory related problems. We use docker container to serve Flink cluster. 
We have 300 slots and 20 jobs are running with parallelism of 10. Also 
the job count may be change over time. Taskmanager memory usage always 
increases. After job cancelation this memory usage doesn't decrease. 
We've tried to investigate the problem and we've got the task manager 
jvm heap snapshot. According to the jam heap analysis, possible memory 
leak was Flink list state descriptor. But we are not sure that is the 
cause of our memory problem. How can we solve the problem?