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https://issues.apache.org/jira/browse/HDDS-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17875185#comment-17875185
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weiming edited comment on HDDS-11240 at 8/20/24 1:33 PM:
---------------------------------------------------------
[~ivanandika]
This problem occurs in our online cluster. Users are very sensitive to the read
and write latency of the cluster, so we are unlikely to be able to perform dump
operations online.
was (Author: JIRAUSER280917):
[~ivanandika]
> 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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