The YCSB client is not very advanced. Hector, asynax or the native driver will work better. There are a few ycsb forks as each nosql person usually needs to fork ycsb to get the most out of it, check github.
On Thu, Apr 11, 2013 at 6:28 PM, Rodrigo Felix < rodrigofelixdealme...@gmail.com> wrote: > Hi, > > I've been changing a benchmarking tool (YCSB) to vary the number of > clients throughout a workload execution and, for some reason, I believe > Cassandra is facing some problems to handle the variation (both up and > down) on the number of connections. Each client has a connection and > clients are added or removed during execution. > For some reason, after some (variable) time, I get the following > exception, using the original Cassandra client implemented by YCSB, that > works for a constant number of clients. > Is there any reason or known issue to explain why cassandra does not > handle properly the number of connection and gives broken pipe? I'm > supposing this can be a Cassandra problem, but feel free to let me know if > you think I'm wrong. > Thanks in advance. > > *Cassandra version:* 1.1.5 > *Some property values:* > > - rpc_keepalive: true > - rpc_min_threads: 16 > - rpc_max_threads: 2048 > > *Exception:* > > *Changing clients from 192 to 240* > *org.apache.thrift.transport.TTransportException: > java.net.SocketException: Broken pipe* > *org.apache.thrift.transport.TTransportException: > java.net.SocketException: Broken pipe* > * at > org.apache.thrift.transport.TIOStreamTransport.flush(TIOStreamTransport.java:161) > * > * at > org.apache.thrift.transport.TFramedTransport.flush(TFramedTransport.java:158) > * > * at > org.apache.cassandra.thrift.Cassandra$Client.send_set_keyspace(Cassandra.java:436) > * > * at > org.apache.cassandra.thrift.Cassandra$Client.set_keyspace(Cassandra.java:425) > * > * at com.yahoo.ycsb.db.CassandraClient10.scan(CassandraClient10.java:314)* > * at com.yahoo.ycsb.DBWrapper.scan(DBWrapper.java:106)* > * at > com.yahoo.ycsb.workloads.CoreWorkload.doTransactionScan(CoreWorkload.java:530) > * > * at > com.yahoo.ycsb.workloads.CoreWorkload.doTransaction(CoreWorkload.java:431) > * > * at com.yahoo.ycsb.ClientThread.run(ClientThread.java:105)* > Att. > > *Rodrigo Felix de Almeida* > LSBD - Universidade Federal do Ceará > Project Manager > MBA, CSM, CSPO, SCJP >
