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https://issues.apache.org/jira/browse/FLINK-36394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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JieTan updated FLINK-36394:
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Attachment: (was: TaskManagerJVMOptions.png)
> Configure Init Metaspace size by default
> ----------------------------------------
>
> Key: FLINK-36394
> URL: https://issues.apache.org/jira/browse/FLINK-36394
> Project: Flink
> Issue Type: Bug
> Components: API / Core
> Affects Versions: 1.16.0, 1.17.2
> Reporter: JieTan
> Priority: Major
>
> We should set the size of the Init JVM Metaspace to a sane default, like
> {{{}-XX:MetaspaceSize=128m{}}}.
> When a Flink job starts, it needs to load class metadata information,
> including class structure information, method information, and field
> information. As a result, the JVM frequently performs FullGC. Sometimes, the
> Metadata GC Threshold (Full GC) is 3.7s long before the Akka System is
> started.
>
> {code:java}
> 2024-07-23T20:08:40.554+0800: 1.801: [Full GC (Metadata GC Threshold)
> 2024-07-23T20:08:40.554+0800: 1.801: [Tenured: 0K->14029K(966656K), 0.0336205
> secs] 108273K->14029K(1401664K), [Metaspace: 20594K->20594K(1067008K)],
> 0.0337494 secs] [Times: user=0.02 sys=0.00, real=0.04 secs]
> 2024-07-23T20:08:42.052+0800: 3.300: [Full GC (Metadata GC Threshold)
> 2024-07-23T20:08:42.052+0800: 3.300: [Tenured: 14029K->28979K(966656K),
> 0.0503497 secs] 184494K->28979K(1401664K), [Metaspace:
> 34384K->34384K(1079296K)], 0.0505108 secs] [Times: user=0.04 sys=0.00,
> real=0.05 secs]
> 2024-07-23T20:08:45.064+0800: 6.312: [Full GC (Metadata GC Threshold)
> 2024-07-23T20:08:45.064+0800: 6.312: [Tenured: 28979K->54550K(966656K),
> 0.0876744 secs] 248437K->54550K(1401664K), [Metaspace:
> 57015K->57015K(1099776K)], 0.0879053 secs] [Times: user=0.07 sys=0.01,
> real=0.09 secs] {code}
>
> The final Metaspace size takes up 100MB+.
> h2. *Solution:*
> {*}I{*}f we configure Init Metaspace size by default. As a result, Flink job
> Metaspace FullGC reduced.
> {code:java}
> OpenJDK 64-Bit Server VM (25.362-b09) for linux-amd64 JRE
> (1.8.0_362-ByteOpenJDK-b09), built on Feb 20 2023 09:42:31 by "root" with gcc
> 8.3.0
> Memory: 4k page, physical 4018480k(137636k free), swap 0k(0k free)
> CommandLine flags: -XX:CompressedClassSpaceSize=260046848
> -XX:GCLogFileSize=104857600 -XX:InitialHeapSize=3368026112
> -XX:MaxHeapSize=3368026112 -XX:MaxMetaspaceSize=268435456
> -XX:MetaspaceSize=134217728 -XX:NumberOfGCLogFiles=5 -XX:+PrintGC
> -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps
> -XX:+UseCompressedClassPointers -XX:+UseCompressedOops
> -XX:+UseGCLogFileRotation {code}
>
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