[#XWIKI-604] Thread Safe issue in MonitorPlugin creating deadlock on the wiki farm

XWiki Core

Thread Safe issue in MonitorPlugin creating deadlock on the wiki farm

Created: 23/Dec/06 00:33 Updated: 23/Dec/06 09:20

Component/s:

Plugin - Other

Affects Version/s:

1.0 B1

Fix Version/s:

1.0 B2

Resolution Date:

23/Dec/06 09:20

Description

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"TP-Processor72" daemon prio=1 tid=0x08a611d8 nid=0x1937 runnable [0xa3f58000..0xa3f597c0]
at java.util.HashMap.put(HashMap.java:385)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.addConnection(XWikiHibernateBaseStore.java:520)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.beginTransaction(XWikiHibernateBaseStore.java:498)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.beginTransaction(XWikiHibernateBaseStore.java:446)
at com.xpn.xwiki.store.XWikiHibernateStore.exists(XWikiHibernateStore.java:167)

"TP-Processor81" daemon prio=1 tid=0x08c3f598 nid=0x19a2 runnable [0xa457e000..0xa457f6c0]
at java.util.HashMap.removeEntryForKey(HashMap.java:560)
at java.util.HashMap.remove(HashMap.java:530)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.removeConnection(XWikiHibernateBaseStore.java:530)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.closeSession(XWikiHibernateBaseStore.java:588)
at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:570)
at com.xpn.xwiki.store.XWikiHibernateStore.exists(XWikiHibernateStore.java:193)

We probably need a synchronized hashmap

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Ludovic Dubost added a comment - 23/Dec/06 09:20

I've used a ConcurrentHashMap instead of a HashMap and commited this in SVN v1800
Ive upgrade the XWiki Farm (only bigisland and molokai for now)