BUG: CQL 2 fixed.()

[Niteesh kumar]

i was trying to run cql 2 query

cqlsh:stats> UPDATE Minutewise_Product_Stats SET 
'2LX:OQ:XYZ.com:664230591:1:totalView'='2LX:SOQ:XYZ.com:664230591:1:totalView'+1, 
'2LX:OQ:XYZ.com:664230591:1:keywordClick'='2LX:SOQ:xyz.com:664230591:1:keywordClick'+1 
WHERE KEY='2017:4' ;


WHEN I GOT  this error

ERROR 20:38:46,220 Error occurred during processing of message.
java.lang.NullPointerException
at 
org.apache.cassandra.cql.UpdateStatement.prepareRowMutations(UpdateStatement.java:151)
at 
org.apache.cassandra.cql.UpdateStatement.prepareRowMutations(UpdateStatement.java:128)
at 
org.apache.cassandra.cql.QueryProcessor.batchUpdate(QueryProcessor.java:245)
at 
org.apache.cassandra.cql.QueryProcessor.processStatement(QueryProcessor.java:563)
at 
org.apache.cassandra.cql.QueryProcessor.process(QueryProcessor.java:817)
at 
org.apache.cassandra.thrift.CassandraServer.execute_cql_query(CassandraServer.java:1675)
at 
org.apache.cassandra.thrift.Cassandra$Processor$execute_cql_query.getResult(Cassandra.java:3721)
at 
org.apache.cassandra.thrift.Cassandra$Processor$execute_cql_query.getResult(Cassandra.java:1)

at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:32)
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:34)
at 
org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:184)
at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

at java.lang.Thread.run(Thread.java:722)


attached is the patch file  to fix this bug
diff --git a/src/java/org/apache/cassandra/cql/UpdateStatement.java b/src/java/org/apache/cassandra/cql/UpdateStatement.java
index 3a47712..0caa61b 100644
--- a/src/java/org/apache/cassandra/cql/UpdateStatement.java
+++ b/src/java/org/apache/cassandra/cql/UpdateStatement.java
@@ -146,8 +146,11 @@ public class UpdateStatement extends AbstractModification
 }
 
 CFMetaData metadata = validateColumnFamily(keyspace, columnFamily, hasCommutativeOperation);
-if (hasCommutativeOperation)
-cLevel.validateCounterForWrite(metadata);
+
+if (hasCommutativeOperation){
+	ConsistencyLevel currentCLevel = getConsistencyLevel();
+	currentCLevel.validateCounterForWrite(metadata);
+}
 
 QueryProcessor.validateKeyAlias(metadata, keyName);
 

persistent connection among cluster nodes

[Niteesh kumar]

while looking at netstat table i observed that my cluster nodes not 
using persistent connection  to talk among themselves on port 9160 to 
redirect request. I also observed that local write latency is around 
30-40 microsecond, while its takes around .5 miliseconds if the chosen 
node is not the node responsible for the key for 50K QPS. I think this 
attributes to connection making time among servers as my servers are on 
same rack.



does cassandra support  this feature to maintain persistent connection 
among cluster nodes