datastax

I created a simple tabe: CREATE TABLE test ( "type" varchar, "value" varchar, PRIMARY KEY(type,value) ); I inserted 5 rows into it: INSERT INTO test(type,value) VALUES('test','tag1') INSERT INTO test(type,value) VALUES('test','tag2') INSERT INTO test(type,value) VALUES('test','tag3') INSERT INTO test(type,value) VALUES('test','tag4') INSERT INTO test(type,value) VALUES('test','tag5') I ran SELECT * from test LIMIT 3 and it works as expected. type | value ------+------ test | tag1 test | tag2 test | tag3 When I ran SELECT COUNT(*) from test LIMIT 3 , it produces: count ------- 5 Shouldn't it

I am trying to configure spring data with cassandra. But I am getting bellow error , when my app is deploying in tomcat. When I check the connection, it is available to the given port. (127.0.0.1:9042). I have include stack trace and spring configuration bellow. Does anyone having idea on this error? Full stack trace : 2015-12-06 17:46:25 ERROR web.context.ContextLoader:331 - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cassandraSession': Invocation of init method failed; nested exception is com.datastax.driver.core

I have a cassandra node at a machine. When I access cqlsh from the same machne it works properly. But when I tried to connect to it's cqlsh using "192.x.x.x" from another machine, I'm getting an error saying Connection error: ('Unable to connect to any servers', {'192.x.x.x': error(111, "Tried connecting to [('192.x.x.x', 9042)]. Last error: Connection refused")}) What is the reason for this? How can I fix it? Nicola Ferraro Probably the remote Cassandra node is not bound to the external network interface but to the loopback one (this is the default configuration). You can ensure this by using

Here is what I am trying to do. I have created two nodes of DataStax enterprise cluster,on top of which I have created a java program to get the count of one table (Cassandra database table). This program was built in eclipse which is actually from a windows box. At the time of running this program from windows it's failing with the following error at runtime: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient memory The same code has been compiled & run successfully on those clusters without any issue. What could be the

I'm writing Spark Jobs that talk to Cassandra in Datastax. Sometimes when working through a sequence of steps in a Spark job, it is easier to just get a new RDD rather than join to the old one. You can do this by calling the SparkContext [getOrCreate][1] method. Now sometimes there are concerns inside a Spark Job that referring to the SparkContext can take a large object (the Spark Context) which is not serializable and try and distribute it over the network. In this case - you're registering a singleton for that JVM, and so it gets around the problem of serialization. One day my tech lead

I would like to know if there is way to limit the number of queries executed simultaneously by the cassandra java driver ? Currently, I execute a lot of queries as follows : ... PreparedStatement stmt = session.prepare("SELECT * FROM users WHERE id = ?"); BoundStatement boundStatement = new BoundStatement(stmt); List<ResultSetFuture> futures = Lists.newArrayListWithExpectedSize(list.length); for(String id : list ) { futures.add(session.executeAsync(boundStatement.bind(id))); } for (ListenableFuture<ResultSet> future : futures) { ResultSet rs = future.get(); ... // do some stuff } Unfortunately