[jboss-user] [JBoss Cache Users] - Re: Locking parent nodes even with lockParentForChildInsertR

[tknyziak]

Sorry for not replying for so long.

I've tried replacing 3.2.0 with 3.2.1 and it didn't help - still, as can be seen on the stack trace, parent nodes get being locked for writing:


  | org.jboss.cache.lock.TimeoutException: Unable to acquire lock on Fqn [/node_name] after [1100] milliseconds for requestor [Thread[RMI TCP Connection(46)-192.168.251.104,5,RMI Runtime]]! Lock held by [Thread[RMI TCP Connection(41)-192.168.251.104,5,RMI Runtime]]
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.acquireLock(MVCCNodeHelper.java:159)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:236)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:186)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:226)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:186)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:226)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:186)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:226)
  |         at org.jboss.cache.mvcc.MVCCNodeHelper.wrapNodeForWriting(MVCCNodeHelper.java:186)
  |         at org.jboss.cache.interceptors.MVCCLockingInterceptor.handlePutDataMapCommand(MVCCLockingInterceptor.java:94)
  | 

I don't understand why all parent nodes need to be write-locked - [I assume the direct parent of the inserted node might be locked so a new child information can be updated] - but seems like their absence in the InvocationContext causes a cache-wide lock until they're actually read into it (createdIfAbsent, if you will). Sure I can bump up the timeout, but I suppose it's a work-around rather than a real solution.

Any thoughts? 

Kind regards


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