[
https://issues.apache.org/jira/browse/JCR-4674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Reschke updated JCR-4674:
--------------------------------
Component/s: (was: jackrabbit-data)
jackrabbit-core
> Deadlock at ItemManager.getItem
> -------------------------------
>
> Key: JCR-4674
> URL: https://issues.apache.org/jira/browse/JCR-4674
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.20.0
> Reporter: Hannes Weichel
> Priority: Major
> Attachments: repository.xml
>
>
> We run a jackrabbit (java 14) in a tomcat (8.5.55) system with many parallel
> user ( > 30000 parallel User ). Jackrabbit runs mostly fast and stable. But
> at a certain point of load the threads are blocking each other. Most threads
> are blocked at this Position:
> mostly at (~25000 threads all blocking):
> *org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:621)*
> and also (~5000 threads all blocking):
>
> *org.apache.jackrabbit.core.state.DefaultISMLocking.acquireReadLock(DefaultISMLocking.java:114)*
> Even when we block further requests, many threads keep in blocked state. We
> must shutdown tomcat and throttle user-request to get the system very slow
> back to a working state.
> What we tried to prevent this (with no success):
> - configured the bundleCacheSize (see attached repository.xml )
> - configured derbyStoragePageCacheSize
> - used a JCR-Session Pool
> - give the system more Hardware (20 Cores, 128 GB RAM, faster Storage)
> - fine tuned tomcat for more und faster threads
>
> *Example StackTraces:*
>
> http-nio-8080-exec-11367
> org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:621)
> org.apache.jackrabbit.core.security.authorization.acl.CompiledPermissionsImpl.canRead(CompiledPermissionsImpl.java:254)
> org.apache.jackrabbit.core.security.DefaultAccessManager.canRead(DefaultAccessManager.java:265)
> org.apache.jackrabbit.core.ItemManager.canRead(ItemManager.java:437)
> org.apache.jackrabbit.core.ItemManager.createItemData(ItemManager.java:847)
> org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:391)
> org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:328)
> org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:621)
> org.apache.jackrabbit.core.NodeImpl$11.perform(NodeImpl.java:2258)
> org.apache.jackrabbit.core.NodeImpl$11.perform(NodeImpl.java:2252)
> org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:216)
> org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
> org.apache.jackrabbit.core.NodeImpl.getProperty(NodeImpl.java:2252)
> ...
>
> http-nio-8080-exec-11352
> org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:621)
> org.apache.jackrabbit.core.security.authorization.acl.CompiledPermissionsImpl.canRead(CompiledPermissionsImpl.java:254)
> org.apache.jackrabbit.core.security.DefaultAccessManager.canRead(DefaultAccessManager.java:265)
> org.apache.jackrabbit.core.ItemManager.canRead(ItemManager.java:437)
> org.apache.jackrabbit.core.ItemManager.createItemData(ItemManager.java:847)
> org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:391)
> org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:304)
> org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:522)
> org.apache.jackrabbit.core.NodeImpl.hasProperty(NodeImpl.java:2460)
> ...
> http-nio-8080-exec-11382
> org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:621)
> org.apache.jackrabbit.core.security.authorization.acl.CompiledPermissionsImpl.canRead(CompiledPermissionsImpl.java:254)
> org.apache.jackrabbit.core.security.DefaultAccessManager.canRead(DefaultAccessManager.java:265)
> org.apache.jackrabbit.core.ItemManager.canRead(ItemManager.java:437)
> org.apache.jackrabbit.core.ItemManager.createItemData(ItemManager.java:847)
> org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:391)
> org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:668)
> org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:646)
> org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:120)
> org.apache.jackrabbit.core.LazyItemIterator.next(LazyItemIterator.java:257)
> org.apache.jackrabbit.core.LazyItemIterator.nextNode(LazyItemIterator.java:166)
> ...
> http-nio-8080-exec-11357
> org.apache.jackrabbit.core.state.DefaultISMLocking.acquireReadLock(DefaultISMLocking.java:114)
> org.apache.jackrabbit.core.state.SharedItemStateManager.acquireReadLock(SharedItemStateManager.java:1893)
> org.apache.jackrabbit.core.state.SharedItemStateManager.getItemState(SharedItemStateManager.java:268)
> org.apache.jackrabbit.core.state.LocalItemStateManager.getPropertyState(LocalItemStateManager.java:135)
> org.apache.jackrabbit.core.state.LocalItemStateManager.getItemState(LocalItemStateManager.java:177)
> org.apache.jackrabbit.core.state.XAItemStateManager.getItemState(XAItemStateManager.java:260)
> org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
> org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:382)
> org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:304)
> org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:522)
> org.apache.jackrabbit.core.NodeImpl.hasProperty(NodeImpl.java:2460)
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
