hi list, 

I am using Cassandra with 3 data centers, each DC has more than 10 nodes.

the schema for a keyspace:
{DC1:3, DC2:3, DC3:3}

now, I put some rows using hector with CL Local_Quorum in DC1 ,and then I get a row with the same CL Local_Quorum in DC1,some exceptions were occured:

Cassandra with dsc-1.0.5, and Hector with 1.1-2.

2012-12-05 21:26:49,667 - WARN [pool-1-thread-3:JCLLoggerAdapter@379] - Could not fullfill request on this host CassandraClient172.16.74.31:9160-1
2012-12-05 21:26:49,668 - WARN [pool-1-thread-3:JCLLoggerAdapter@437] - Exception: 
me.prettyprint.hector.api.exceptions.HTimedOutException: TimedOutException()
at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:35)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl$3.execute(KeyspaceServiceImpl.java:163)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl$3.execute(KeyspaceServiceImpl.java:145)
at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:103)
at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:258)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:131)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl.getRangeSlices(KeyspaceServiceImpl.java:167)
at me.prettyprint.cassandra.model.thrift.ThriftRangeSlicesQuery$1.doInKeyspace(ThriftRangeSlicesQuery.java:66)
at me.prettyprint.cassandra.model.thrift.ThriftRangeSlicesQuery$1.doInKeyspace(ThriftRangeSlicesQuery.java:62)
at me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20)
at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85)
at me.prettyprint.cassandra.model.thrift.ThriftRangeSlicesQuery.execute(ThriftRangeSlicesQuery.java:61)
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:176)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: TimedOutException()
at org.apache.cassandra.thrift.Cassandra$get_range_slices_result.read(Cassandra.java:12830)
at org.apache.cassandra.thrift.Cassandra$Client.recv_get_range_slices(Cassandra.java:762)
at org.apache.cassandra.thrift.Cassandra$Client.get_range_slices(Cassandra.java:734)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl$3.execute(KeyspaceServiceImpl.java:151)
... 19 more

any suggestion with this issue? thanks.