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https://issues.apache.org/jira/browse/HDDS-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17875091#comment-17875091
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Ivan Andika edited comment on HDDS-11240 at 8/20/24 9:21 AM:
-------------------------------------------------------------
[~weiming] If possible, could you try to generate a dump or use things like
VisualVM to find the entries of the ThreadLocalMap so that we can find the
entries that ThreadLocal usage that accounts most of size of the ThreadLocalMap?
was (Author: JIRAUSER298977):
[~weiming] If possible, could you try to generate a dump or use things like
VisualVM to find the entries of the ThreadLocalMap so that we can find the
entries that takes most of size of the ThreadLocalMap?
> High cpu usage on ReadWrite locks in JDK17
> ------------------------------------------
>
> Key: HDDS-11240
> URL: https://issues.apache.org/jira/browse/HDDS-11240
> Project: Apache Ozone
> Issue Type: Bug
> Components: OM
> Affects Versions: 1.4.0
> Environment: JDK：
> openjdk 17.0.2 2022-01-18
> OpenJDK Runtime Environment (build 17.0.2+8-86)
> OpenJDK 64-Bit Server VM (build 17.0.2+8-86, mixed mode, sharing)
> Ozone:
> 1.4.0
>
> Reporter: weiming
> Assignee: Tanvi Penumudy
> Priority: Major
> Attachments: flamegraph.profile.html,
> image-2024-07-28-20-17-58-466.png, image-2024-07-30-09-32-16-320.png
>
>
> That will cause threads on the following stack trace to consume a lot of CPU:
> "IPC Server handler 7 on default port 9862" #3994 daemon prio=5 os_prio=0
> cpu=5403833.36ms elapsed=653145.54s tid=0x00007fa03fdd2a00 nid=0x921f9
> runnable [0x00007fa0ca3fd000]
> java.lang.Thread.State: RUNNABLE
> at
> java.lang.ThreadLocal$ThreadLocalMap.expungeStaleEntry(java.base@17.0.2/ThreadLocal.java:632)
> at
> java.lang.ThreadLocal$ThreadLocalMap.remove(java.base@17.0.2/ThreadLocal.java:516)
> at java.lang.ThreadLocal.remove(java.base@17.0.2/ThreadLocal.java:242)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(java.base@17.0.2/ReentrantReadWriteLock.java:430)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(java.base@17.0.2/AbstractQueuedSynchronizer.java:1094)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(java.base@17.0.2/ReentrantReadWriteLock.java:897)
> at
> org.apache.hadoop.ozone.upgrade.AbstractLayoutVersionManager.needsFinalization(AbstractLayoutVersionManager.java:182)
> at
> org.apache.hadoop.ozone.om.request.validation.ValidationCondition$1.shouldApply(ValidationCondition.java:39)
> at
> org.apache.hadoop.ozone.om.request.validation.RequestValidations.lambda$0(RequestValidations.java:110)
> at
> org.apache.hadoop.ozone.om.request.validation.RequestValidations$$Lambda$839/0x00000008013cda80.test(Unknown
> Source)
>
> [^flamegraph.profile.html]
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