[jboss-jira] [JBoss JIRA] Commented: (JBTM-213) Threads in endless loop in TransactionReaper.
[ http://jira.jboss.com/jira/browse/JBTM-213?page=comments#action_12361038 ]
Jonathan Halliday commented on JBTM-213:
----------------------------------------
Right, that's a particularly big "D'Oh" especially since the declaration
for the troublesome data structure is on the very next line to one that is synchronized to
avoid this same issue. 'scuse me whilst I die of embarrassment.
...
private SortedSet _transactions = Collections.synchronizedSortedSet(new TreeSet()); // C
of ReaperElement
private Map _timeouts = new WeakHashMap(); // key = Reapable, value = Integer
...
Threads in endless loop in TransactionReaper.
---------------------------------------------
Key: JBTM-213
URL: http://jira.jboss.com/jira/browse/JBTM-213
Project: JBoss Transaction Manager
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: JTA Implementation
Reporter: Phillip Thurmond
Assigned To: Mark Little
After generating a load against JBossAS 4.2 beta1, the cpu is pegged at 100% even after
the load has stopped. A thread dump reveals several threads at
TransactionReaper.insert(). These threads are all doing a WeakHashMap.get(). Looking at
TransactionReaper, I believe this is caused by unsynchronized access to the _timeouts
WeakHahsMap. This is line 324 in TransactionReaper.java.
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