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Jonathan Ellis commented on CASSANDRA-4578: ------------------------------------------- Would prefer to have the callback final in constructor to make it more clear that it doesn't get changed during processing, otherwise +1 > Dead lock in mutation stage when many concurrent writes to few columns > ---------------------------------------------------------------------- > > Key: CASSANDRA-4578 > URL: https://issues.apache.org/jira/browse/CASSANDRA-4578 > Project: Cassandra > Issue Type: Bug > Components: Core > Affects Versions: 0.8.0 > Environment: 15 cassandra instances > CentOS5 > 8 Core 64GB Memory > java version "1.6.0_33" > Java(TM) SE Runtime Environment (build 1.6.0_33-b04) > Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03, mixed mode) > Reporter: Suguru Namura > Assignee: Sylvain Lebresne > Priority: Minor > Fix For: 1.1.6 > > Attachments: 4578.txt, threaddump-1344957574788.tdump > > > When I send many request to increment counters to few counter columns, > sometimes mutation stage cause dead lock. When it happened, all of mutation > threads are locked and do not accept updates any more. > {noformat} > "MutationStage:432" - Thread t@1389 > java.lang.Thread.State: TIMED_WAITING > at java.lang.Object.wait(Native Method) > - waiting on <b90b45b> (a org.apache.cassandra.utils.SimpleCondition) > at java.lang.Object.wait(Object.java:443) > at java.util.concurrent.TimeUnit.timedWait(TimeUnit.java:292) > at > org.apache.cassandra.utils.SimpleCondition.await(SimpleCondition.java:54) > at > org.apache.cassandra.service.AbstractWriteResponseHandler.get(AbstractWriteResponseHandler.java:55) > at > org.apache.cassandra.db.CounterMutationVerbHandler.doVerb(CounterMutationVerbHandler.java:51) > at > org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:59) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > at java.lang.Thread.run(Thread.java:662) > Locked ownable synchronizers: > - locked <4b1b0a6f> (a > java.util.concurrent.locks.ReentrantLock$NonfairSync) > {noformat} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira