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https://issues.apache.org/jira/browse/HDDS-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17869577#comment-17869577
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Sumit Agrawal commented on HDDS-11240:
--------------------------------------
IMO, With respect to only above case, for needFinalization, it can be changed
with AtomicBoolean to value finalized or not. This might solve only this case
as in bug to avoid locking.
But lock is used in multiple places. We may need change further test if there
is any further bottleneck due to some other lock.
> 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
> 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$ThreadLocalMap.expungeStaleEntry([email protected]/ThreadLocal.java:632)
> at
> java.lang.ThreadLocal$ThreadLocalMap.remove([email protected]/ThreadLocal.java:516)
> at java.lang.ThreadLocal.remove([email protected]/ThreadLocal.java:242)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared([email protected]/ReentrantReadWriteLock.java:430)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared([email protected]/AbstractQueuedSynchronizer.java:1094)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock([email protected]/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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