Hi I installed the latest version of Cassandra 4 weeks ago: version 2 -A
From: Huang, Roger [mailto:[email protected]] Sent: February-03-14 5:14 PM To: [email protected] Subject: RE: trident simplest aggregator into cassandra Adrian What version of Cassandra are you using? From: Adrian Mocanu [mailto:[email protected]] Sent: Monday, February 03, 2014 4:09 PM To: [email protected]<mailto:[email protected]> Subject: trident simplest aggregator into cassandra Hi I'm using Trident to perform some aggregations and store the results into cassandra. I've looked at IBackingMap and specifically at some tutorials on trident site and I've tried using CassandraState which I found online in some repository. After creating what I thought were column family and keys corresponding to the code I still cannot figure out how to run the sample topology and not crash due to some Cassandra schema error (InvalidRequestException(why:Invalid cell for CQL3 table state. The CQL3 column component (over) does not correspond to a defined CQL3 column). Here is the sample code I use: val cassandraStateFactory:StateFactory = chat.CassandraState.transactional("10.10.6.80") val spout = new FixedBatchSpout(new Fields("sentence"), 3, new Values("the cow jumped over the moon"), new Values("the man went to the store and bought some candy"), new Values("four score and seven years ago"), new Values("how many apples can you eat")) spout.setCycle(true) val wordCounts :TridentState= tridentBuilder.newStream("spout1", spout) .each(new Fields("sentence"), new Split(), new Fields("word")) .groupBy(new Fields("word")) .persistentAggregate(cassandraStateFactory, new Count(), new Fields("count")) .parallelismHint(6) val cluster = new LocalCluster(); val config = new Config(); config.setMaxSpoutPending(100); config.setMaxSpoutPending(25); cluster.submitTopology("test", config, tridentBuilder.build()); What is the schema needed to run this example (it also uses CassandraState)? thanks A
