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https://issues.apache.org/jira/browse/JCR-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Guggisberg updated JCR-2197:
-----------------------------------
Component/s: (was: locks)
jackrabbit-core
Priority: Minor (was: Major)
Issue Type: New Feature (was: Bug)
adjusting issue type, priority and component
> Support configuration of timeout in Statements for Database implementations
> ---------------------------------------------------------------------------
>
> Key: JCR-2197
> URL: https://issues.apache.org/jira/browse/JCR-2197
> Project: Jackrabbit Content Repository
> Issue Type: New Feature
> Components: jackrabbit-core
> Affects Versions: 1.5.6
> Reporter: Micah Whitacre
> Priority: Minor
>
> Allowing for the configuration and usage of a timeout value for Statements[1]
> would provide a means avoiding dead lock when a long running/stalled SQL
> Statement holds onto a lock preventing other threads from acquiring locks.
> The situation i have seen is where a JVM handling multiple request each in
> its own Thread will at some points become stalled. At the start of each
> thread processing the request it will acquire its own session to the
> repository which stores all information in an an Oracle database. The issue
> we are seeing is that deadlock occurs because the SQL write statement to the
> VersionManager is taking too long/stalling in the Oracle driver code. Since
> it is writing, the write lock is acquired and this prevents other threads
> from acquiring a session because they get blocked trying to acquire the read
> lock of the Version Manager.
> If the SQL statement timed out after a certain time, this would alleviate the
> problem of threads continually hanging and make use of the Jackrabbit auto
> reconnect functionality. The user of timeout is supported when using JNDI so
> this request would move it towards being first class support on the database
> implementations.
> [1] -
> http://java.sun.com/j2se/1.5.0/docs/api/java/sql/Statement.html#setQueryTimeout(int)
> [2] - http://forums.sun.com/thread.jspa?threadID=343023&start=30&tstart=0
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