Hi, this should be posted on the user mailing list not the dev.
Apart from that, this looks like normal/standard behaviour of JVM, and has very little to do with Flink. Garbage Collector (GC) is kicking in when memory usage is approaching some threshold: https://www.google.com/search?q=jvm+heap+memory+usage&tbm=isch Piotrek pon., 5 kwi 2021 o 22:54 Lu Niu <qqib...@gmail.com> napisał(a): > Hi, > > we need to update our email system then :) . Here are the links: > > > https://drive.google.com/file/d/1lZ5_P8_NqsN1JeLzutGj4DxkyWJN75mR/view?usp=sharing > > > https://drive.google.com/file/d/1J6c6rQJwtDp1moAGlvQyLQXTqcuG4HjL/view?usp=sharing > > > https://drive.google.com/file/d/1-R2KzsABC471AEjkF5qTm5O3V47cpbBV/view?usp=sharing > > All are DataStream job. > > Best > Lu > > On Sun, Apr 4, 2021 at 9:17 PM Yun Gao <yungao...@aliyun.com> wrote: > > > > > Hi Lu, > > > > The image seems not be able to shown due to the mail server limitation, > > could you upload it somewhere and paste the link here ? > > > > Logically, I think zigzag usually due to there are some small object get > > created and eliminated soon in the heap. Are you running a SQL job or a > > DataStream job ? > > > > Best, > > Yun > > > > ------------------------------------------------------------------ > > Sender:Lu Niu<qqib...@gmail.com> > > Date:2021/04/05 12:06:24 > > Recipient:dev@flink.apache.org<dev@flink.apache.org> > > Theme:Zigzag shape in TM JVM used memory > > > > Hi, Flink dev > > > > We observed that the TM JVM used memory metric shows zigzag shape among > > lots of our applications, although these applications are quite different > > in business logic. The upper bound is close to the max heap size. Is this > > expected in flink application? Or does flink internally > > aggressively pre-allocate memory? > > > > app1 > > [image: Screen Shot 2021-04-04 at 8.46.45 PM.png] > > app2 > > [image: Screen Shot 2021-04-04 at 8.45.35 PM.png] > > app3 > > [image: Screen Shot 2021-04-04 at 8.43.53 PM.png] > > > > Best > > Lu > > > > >
