Ankush Malhotra created JCR-3738:
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Summary: CLONE - Deadlock on LOCAL_REVISION table in clustering
environment
Key: JCR-3738
URL: https://issues.apache.org/jira/browse/JCR-3738
Project: Jackrabbit Content Repository
Issue Type: Bug
Components: clustering
Affects Versions: 2.4.3
Environment: Env.1: 4x Linux server CentOS 5 MSSQL 2008 database
(production system)
Env.2: 2x Linux Ubuntu 10.04 server tested with PostgreSQL 9.1, H2, MSSQL 2008
and mySQL 5.5 (lab system)
Reporter: Ankush Malhotra
Assignee: Bart van der Schans
Priority: Critical
Fix For: 2.5.3
When inserting a lot of nodes concurrently (100/200 threads) the system hangs
generating a deadlock on the LOCAL_REVISION table.
There is a thread that starts a transaction but the transaction remains open,
while another thread tries to acquire the lock on the table.
This actually happen even if there is only a server up but configured in
cluster mode.
I found that in AbstractJournal, we try to write the LOCAL_REVISION even if we
don't sync any record because they're generated by the same journal of the
thread running.
Removing this unnecessary (to me :-) ) write to the LOCAL_REVISION table,
remove the deadlock.
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