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[eclipselink-users] ConnectionPool deadlocks
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Folks;
we use EclipseLink JPA (2.6.0) in a Dropwizard based service and
recently are running into deadlocks. In those situations, all services
trying to do database I/O will run into timeouts and the whole
application becomes unusable.
Looking at thread dumps, by then we see plenty of these:
"dw-102 - GET /foo" - Thread t@102
java.lang.Thread.State: BLOCKED
at org.eclipse.persistence.sessions.server.ConnectionPool.acquireConnection(ConnectionPool.java:128)
- waiting to lock <5166ee20> (a org.eclipse.persistence.sessions.server.ConnectionPool) owned by "dw-79 - GET /foobar" t@79
"dw-101 - GET /bar" - Thread t@101
java.lang.Thread.State: BLOCKED
at org.eclipse.persistence.sessions.server.ConnectionPool.releaseConnection(ConnectionPool.java:325)
- waiting to lock <5166ee20> (a org.eclipse.persistence.sessions.server.ConnectionPool) owned by "dw-79 - GET /foobar" t@79
What might be causing this? We thought about too few connections in a
pool but releaseConnection() not being able to complete makes us
question that. Any ideas on that?
TIA and all the best,
Kristian
