[jira] [Created] (CASSANDRA-10827) Counter mutation lock timeout prints ugly exception

["Paulo Motta (JIRA)" <ji...@apache.org>]

Paulo Motta created CASSANDRA-10827:
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             Summary: Counter mutation lock timeout prints ugly exception
                 Key: CASSANDRA-10827
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10827
             Project: Cassandra
          Issue Type: Bug
          Components: Coordination
            Reporter: Paulo Motta
            Priority: Minor


If the coordinator is a replica of the counter shard, the {{StorageProxy}} counter write is submitted to the counter mutation stage.

In case the write times out because it cannot acquire the lock, the {{StorageProxy}} sends a {{WriteTimeout}} to the client, but the {{DroppableRunnable}} also throws an uncaught exception that is printed in the logs:

{noformat}
WARN [SharedPool-Worker-55] 2015-12-03 02:53:53,086 AbstractTracingAwareExecutorService.java:169 - Uncaught exception on thread Thread[SharedPool-Worker-55,5,main]: {} 
java.lang.RuntimeException: org.apache.cassandra.exceptions.WriteTimeoutException: Operation timed out - received only 0 responses.
at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2191) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] 
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_60] 
at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] 
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [cassandra-all-2.1.8.689.jar:2.1.8.689] 
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60] 
Caused by: org.apache.cassandra.exceptions.WriteTimeoutException: Operation timed out - received only 0 responses. 
at org.apache.cassandra.db.CounterMutation.grabCounterLocks(CounterMutation.java:146) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] 
at org.apache.cassandra.db.CounterMutation.apply(CounterMutation.java:122) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] 
at org.apache.cassandra.service.StorageProxy$8.runMayThrow(StorageProxy.java:1152) ~[cassandra-all-2.1.8.689.jar:2.1.8.689] 
at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2188) ~[cassandra-all-2.1.8.689.jar:2.1.8.689]
{noformat}

We should probably supress the exception and log a dropped counter mutation.



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