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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (JCR-2747) ConcurrentModificationException in IndexMerger
Date Tue, 14 Sep 2010 09:57:32 GMT

     [ https://issues.apache.org/jira/browse/JCR-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting resolved JCR-2747.
--------------------------------

      Assignee: Jukka Zitting
    Resolution: Fixed

Fixed in revision 996810.

> ConcurrentModificationException in IndexMerger
> ----------------------------------------------
>
>                 Key: JCR-2747
>                 URL: https://issues.apache.org/jira/browse/JCR-2747
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: indexing, jackrabbit-core
>    Affects Versions: 2.0.0, 2.1.0, 2.1.1
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 2.2.0
>
>
> The IndexMerger.start() method can cause the following ConcurrentModificationException
to be thrown since it doesn't protect against concurrent access to the busyMergers list. The
workers started by the start() method will remove themselves from the busyMergers list, which
makes it possible for a quick worker to concurrently modify the list before the start() method
is finished iterating through it.
> java.util.ConcurrentModificationException
> 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> 	at java.util.AbstractList$Itr.next(AbstractList.java:343)
> 	at org.apache.jackrabbit.core.query.lucene.IndexMerger.start(IndexMerger.java:122)
> 	at org.apache.jackrabbit.core.query.lucene.MultiIndex.<init>(MultiIndex.java:325)
> 	at org.apache.jackrabbit.core.query.lucene.SearchIndex.doInit(SearchIndex.java:507)
> 	at org.apache.jackrabbit.core.query.AbstractQueryHandler.init(AbstractQueryHandler.java:78)
> 	at org.apache.jackrabbit.core.config.RepositoryConfigurationParser$1.getQueryHandler(RepositoryConfigurationParser.java:630)
> 	at org.apache.jackrabbit.core.config.WorkspaceConfig.getQueryHandler(WorkspaceConfig.java:215)
> 	at org.apache.jackrabbit.core.config.WorkspaceConfig.getQueryHandler(WorkspaceConfig.java:215)
> 	at org.apache.jackrabbit.core.SearchManager.<init>(SearchManager.java:173)
> 	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.getSearchManager(RepositoryImpl.java:1868)
> 	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.doPostInitialize(RepositoryImpl.java:2077)
> 	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.initialize(RepositoryImpl.java:1996)
> 	at org.apache.jackrabbit.core.RepositoryImpl.initStartupWorkspaces(RepositoryImpl.java:535)

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