Hi, John Sorry for the late reply. You can use MAT[1] to analyze the dump file. Check whether have too many loaded classes.
[1] https://www.eclipse.org/mat/ > 2022年4月18日 下午9:55，John Smith <java.dev....@gmail.com> 写道： > > Hi, can anyone help with this? I never looked at a dump file before. > > On Thu, Apr 14, 2022 at 11:59 AM John Smith <java.dev....@gmail.com > <mailto:java.dev....@gmail.com>> wrote: > Hi, so I have a dump file. What do I look for? > > On Thu, Mar 31, 2022 at 3:28 PM John Smith <java.dev....@gmail.com > <mailto:java.dev....@gmail.com>> wrote: > Ok so if there's a leak, if I manually stop the job and restart it from the > UI multiple times, I won't see the issue because because the classes are > unloaded correctly? > > > On Thu, Mar 31, 2022 at 9:20 AM huweihua <huweihua....@gmail.com > <mailto:huweihua....@gmail.com>> wrote: > > The difference is that manually canceling the job stops the JobMaster, but > automatic failover keeps the JobMaster running. But looking on TaskManager, > it doesn't make much difference > > >> 2022年3月31日 上午4:01，John Smith <java.dev....@gmail.com >> <mailto:java.dev....@gmail.com>> 写道： >> >> Also if I manually cancel and restart the same job over and over is it the >> same as if flink was restarting a job due to failure? >> >> I.e: When I click "Cancel Job" on the UI is the job completely unloaded vs >> when the job scheduler restarts a job because if whatever reason? >> >> Lile this I'll stop and restart the job a few times or maybe I can trick my >> job to fail and have the scheduler restart it. Ok let me think about this... >> >> On Wed, Mar 30, 2022 at 10:24 AM 胡伟华 <huweihua....@gmail.com >> <mailto:huweihua....@gmail.com>> wrote: >>> So if I run the same jobs in my dev env will I still be able to see the >>> similar dump? >> I think running the same job in dev should be reproducible, maybe you can >> have a try. >> >>> If not I would have to wait at a low volume time to do it on production. >>> Aldo if I recall the dump is as big as the JVM memory right so if I have >>> 10GB configed for the JVM the dump will be 10GB file? >> >> Yes, JMAP will pause the JVM, the time of pause depends on the size to dump. >> you can use "jmap -dump:live" to dump only the reachable objects, this will >> take a brief pause >> >> >> >>> 2022年3月30日 下午9:47，John Smith <java.dev....@gmail.com >>> <mailto:java.dev....@gmail.com>> 写道： >>> >>> I have 3 task managers (see config below). There is total of 10 jobs with >>> 25 slots being used. >>> The jobs are 100% ETL I.e; They load Json, transform it and push it to >>> JDBC, only 1 job of the 10 is pushing to Apache Ignite cluster. >>> >>> FOR JMAP. I know that it will pause the task manager. So if I run the same >>> jobs in my dev env will I still be able to see the similar dump? I I assume >>> so. If not I would have to wait at a low volume time to do it on >>> production. Aldo if I recall the dump is as big as the JVM memory right so >>> if I have 10GB configed for the JVM the dump will be 10GB file? >>> >>> >>> # Operating system has 16GB total. >>> env.ssh.opts: -l flink -oStrictHostKeyChecking=no >>> >>> cluster.evenly-spread-out-slots: true >>> >>> taskmanager.memory.flink.size: 10240m >>> taskmanager.memory.jvm-metaspace.size: 2048m >>> taskmanager.numberOfTaskSlots: 16 >>> parallelism.default: 1 >>> >>> high-availability: zookeeper >>> high-availability.storageDir: file:///mnt/flink/ha/flink_1_14/ <> >>> high-availability.zookeeper.quorum: ... >>> high-availability.zookeeper.path.root: /flink_1_14 >>> high-availability.cluster-id: /flink_1_14_cluster_0001 >>> >>> web.upload.dir: /mnt/flink/uploads/flink_1_14 >>> >>> state.backend: rocksdb >>> state.backend.incremental: true >>> state.checkpoints.dir: file:///mnt/flink/checkpoints/flink_1_14 <> >>> state.savepoints.dir: file:///mnt/flink/savepoints/flink_1_14 <> >>> >>> On Wed, Mar 30, 2022 at 2:16 AM 胡伟华 <huweihua....@gmail.com >>> <mailto:huweihua....@gmail.com>> wrote: >>> Hi, John >>> >>> Could you tell us you application scenario? Is it a flink session cluster >>> with a lot of jobs? >>> >>> Maybe you can try to dump the memory with jmap and use tools such as MAT to >>> analyze whether there are abnormal classes and classloaders >>> >>> >>> > 2022年3月30日 上午6:09，John Smith <java.dev....@gmail.com >>> > <mailto:java.dev....@gmail.com>> 写道： >>> > >>> > Hi running 1.14.4 >>> > >>> > My tasks manager still fails with java.lang.OutOfMemoryError: Metaspace. >>> > The metaspace out-of-memory error has occurred. This can mean two things: >>> > either the job requires a larger size of JVM metaspace to load classes or >>> > there is a class loading leak. >>> > >>> > I have 2GB of metaspace configed taskmanager.memory.jvm-metaspace.size: >>> > 2048m >>> > >>> > But the task nodes still fail. >>> > >>> > When looking at the UI metrics, the metaspace starts low. Now I see 85% >>> > usage. It seems to be a class loading leak at this point, how can we >>> > debug this issue? >>> >> >
