> I have tried this method, but the problem still exist. How much memory do you configure for it?
> is 21 instances of "org.apache.flink.util.ChildFirstClassLoader" normal Not quite sure about it. AFAIK, each job will have a classloader. Multiple tasks of the same job in the same TM will share the same classloader. The classloader will be removed if there is no more task running on the TM. Classloader without reference will be finally cleanup by GC. Could you share JM and TM logs for further analysis? I'll also involve @Guowei Ma in this thread. Best, Yangze Guo On Tue, Apr 6, 2021 at 6:05 PM 太平洋 <495635...@qq.com> wrote: > > I have tried this method, but the problem still exist. > by heap dump analysis, is 21 instances of > "org.apache.flink.util.ChildFirstClassLoader" normal? > > > ------------------ 原始邮件 ------------------ > 发件人: "Yangze Guo" <karma...@gmail.com>; > 发送时间: 2021年4月6日(星期二) 下午4:32 > 收件人: "太平洋"<495635...@qq.com>; > 抄送: "user"<user@flink.apache.org>; > 主题: Re: period batch job lead to OutOfMemoryError: Metaspace problem > > I think you can try to increase the JVM metaspace option for > TaskManagers through taskmanager.memory.jvm-metaspace.size. [1] > > [1] > https://ci.apache.org/projects/flink/flink-docs-master/docs/deployment/memory/mem_trouble/#outofmemoryerror-metaspace > > Best, > Yangze Guo > > Best, > Yangze Guo > > > On Tue, Apr 6, 2021 at 4:22 PM 太平洋 <495635...@qq.com> wrote: > > > > batch job： > > read data from s3 by sql，then by some operators and write data to > > clickhouse and kafka. > > after some times, task-manager quit with OutOfMemoryError: Metaspace. > > > > env： > > flink version：1.12.2 > > task-manager slot count: 5 > > deployment： standalone kubernetes session 模式 > > dependencies： > > > > <dependency> > > > > <groupId>org.apache.flink</groupId> > > > > <artifactId>flink-connector-kafka_2.11</artifactId> > > > > <version>${flink.version}</version> > > > > </dependency> > > > > <dependency> > > > > <groupId>com.google.code.gson</groupId> > > > > <artifactId>gson</artifactId> > > > > <version>2.8.5</version> > > > > </dependency> > > > > <dependency> > > > > <groupId>org.apache.flink</groupId> > > > > <artifactId>flink-connector-jdbc_2.11</artifactId> > > > > <version>${flink.version}</version> > > > > </dependency> > > > > <dependency> > > > > <groupId>ru.yandex.clickhouse</groupId> > > > > <artifactId>clickhouse-jdbc</artifactId> > > > > <version>0.3.0</version> > > > > </dependency> > > > > <dependency> > > > > <groupId>org.apache.flink</groupId> > > > > <artifactId>flink-parquet_2.11</artifactId> > > > > <version>${flink.version}</version> > > > > </dependency> > > > > <dependency> > > > > <groupId>org.apache.flink</groupId> > > > > <artifactId>flink-json</artifactId> > > > > <version>${flink.version}</version> > > > > </dependency> > > > > > > heap dump1: > > > > Leak Suspects > > > > System Overview > > > > Leaks > > > > Overview > > > > > > Problem Suspect 1 > > > > 21 instances of "org.apache.flink.util.ChildFirstClassLoader", loaded by > > "sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0" occupy 29,656,880 (41.16%) > > bytes. > > > > Biggest instances: > > > > org.apache.flink.util.ChildFirstClassLoader @ 0x73ca2a1e8 - 1,474,760 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d2af820 - 1,474,168 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73cdcaa10 - 1,474,160 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73cf6aab0 - 1,474,160 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d1111d8 - 1,474,160 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d2bb108 - 1,474,128 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73de202e0 - 1,474,120 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73dadc778 - 1,474,112 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d5f70e8 - 1,474,064 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d93aa38 - 1,474,064 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e179638 - 1,474,064 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73dc80418 - 1,474,056 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73dfcda60 - 1,474,056 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e4bcd38 - 1,474,056 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d6006e8 - 1,474,032 > > (2.05%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73c7d2ad8 - 1,461,944 > > (2.03%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73ca1bb98 - 1,460,752 > > (2.03%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73bf203f0 - 1,460,744 > > (2.03%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e3284a8 - 1,445,232 > > (2.01%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e65de00 - 1,445,232 > > (2.01%) bytes. > > > > > > > > Keywords > > org.apache.flink.util.ChildFirstClassLoader > > sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0 > > Details » > > > > Problem Suspect 2 > > > > 34,407 instances of "org.apache.flink.core.memory.HybridMemorySegment", > > loaded by "sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0" occupy 7,707,168 > > (10.70%) bytes. > > > > Keywords > > org.apache.flink.core.memory.HybridMemorySegment > > sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0 > > > > Details » > > > > > > > > heap dump2: > > > > Leak Suspects > > > > System Overview > > > > Leaks > > > > Overview > > > > Problem Suspect 1 > > > > 21 instances of "org.apache.flink.util.ChildFirstClassLoader", loaded by > > "sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0" occupy 26,061,408 (30.68%) > > bytes. > > > > Biggest instances: > > > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e9e9930 - 1,474,224 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73edce0b8 - 1,474,224 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73f1ad7d0 - 1,474,168 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73f3e5118 - 1,474,168 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73f5d3fe0 - 1,474,168 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73ebd8d28 - 1,474,160 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73efc00c0 - 1,474,160 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73e2251a8 - 1,474,136 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73cc24af0 - 1,474,064 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73cdca3e0 - 1,474,064 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73cf6f860 - 1,474,064 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d114768 - 1,474,064 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73ca6f878 - 1,474,056 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d2b7640 - 1,474,056 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73d2c1d80 - 1,474,040 > > (1.74%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73c7e2868 - 1,469,720 > > (1.73%) bytes. > > org.apache.flink.util.ChildFirstClassLoader @ 0x73bf34a98 - 1,460,808 > > (1.72%) bytes. > > > > > > > > Keywords > > org.apache.flink.util.ChildFirstClassLoader > > sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0 > > Details » > > > > Problem Suspect 2 > > > > 4 instances of > > "org.apache.flink.streaming.runtime.tasks.OneInputStreamTask", loaded by > > "sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0" occupy 11,644,200 (13.71%) > > bytes. > > > > Biggest instances: > > > > org.apache.flink.streaming.runtime.tasks.OneInputStreamTask @ 0x73e2d0cb0 - > > 4,364,536 (5.14%) bytes. > > org.apache.flink.streaming.runtime.tasks.OneInputStreamTask @ 0x73d62fb88 - > > 3,643,576 (4.29%) bytes. > > org.apache.flink.streaming.runtime.tasks.OneInputStreamTask @ 0x73dae0270 - > > 3,635,952 (4.28%) bytes. > > > > > > > > Keywords > > sun.misc.Launcher$AppClassLoader @ 0x73b2d42e0 > > org.apache.flink.streaming.runtime.tasks.OneInputStreamTask > > Details » > > > >
