> 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> 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? >
