On 25/05/2016 17:56, bastien dine wrote:
Hi,
I'm running a 3 nodes Cassandra 2.1.x cluster. Each node has 8vCPU and 30
Go RAM.
Replication factor = 3 for my keyspace.
...
Is there a problem with the Java Driver ? The load balancing is not
Hi Bastien,
A replication factor of 3 for a 3 node cluster does not balance the
load: since you ask for 3 copies of the data (rf=3) on 3 nodes cluster,
each node will have a copy of the data and you are overloading all nodes.
May be you should try with a rf = 2 or add nodes to your cluster ?
"working" ? How can I list connections on a node ?
For a 3.x (I think also 2.x) you can trace requests at the query level
with enableTracing() method.
something like : (uncomment the line with .enableTracing() )
session.execute( boundedInsertEventStatement.bind( aggregateId,
aggregateType, eventType, payload )
.setConsistencyLevel(ConsistencyLevel.ONE)
//.enableTracing()
);
see the doc for other classes and tracing or consistency options,
and have a look at nodetool settraceprobability if you cannot change the
code
The queries and query plans appear in the system_traces.sessions and
system_traces.events tables. It can be very verbose for query plans
(events table), may be you should truncate the sessions and events
tables before running your load (on 3.x tables are truncated on startup)
Regards,
Bastien
HTH,
--
best,
Alain
