datastax

I am trying to return a Vertex (in tinkerpop format) that it was just created with Gremlin: DseCluster dseCluster = DseCluster.builder() .addContactPoint(DbC.dseHost) .build(); DseSession dseSession = dseCluster.connect(); GraphTraversal traversal = graph.addV(VertexLabels.User) .property("username", "testuser") GraphStatement graphStatement = DseGraph.statementFromTraversal( traversal ); GraphResultSet grs = dseSession.executeGraph(graphStatement.setGraphName(DbC.graphName)); Vertex v = grs.one().as(Vertex.class); and I am getting this exception... java.lang.ClassCastException: com.datastax

I have installed datastax Cassandra in 2 independent machines(one with 16gb RAM and other with 32GB RAM) and going with most of the default configuration. I have created a table with some 700 columns, when I try to insert records using java its able to insert 1000 records per 30 seconds, which seems be very less for me as per datastax benchmark it should be around 18000+. For my surprise performance is same in both 32GB & 16GB RAM machines. I am new to Cassandra, can any one help me in this regard. I feel I doing something wrong with Cassandra.yaml configurations. I did a Benchmarking and

I want to write Structure Streaming Data into Cassandra using Pyspark API. My data flow is like below: Nifi -> Kafka -> Spark Structure Streaming -> Cassandra I have tried below way: query = df.writeStream\ .format("org.apache.spark.sql.cassandra")\ .option("keyspace", "demo")\ .option("table", "test")\ .start() But getting below error message: "org.apache.spark.sql.cassandra" does not support streaming write. Also another approach I have tried: [ Source - DSE 6.0 Administrator Guide] query = df.writeStream\ .cassandraFormat("test", "demo")\ .start() But got exception: AttributeError:

I'm using Datastax's lovely java driver for cassandra. I was trying to encapsulate all of my query strings into the built in accessors for mapping, but I require the ability to set the paging state for a query. I see that this is possible with a normal Statement (SimpleStatement), but I haven't found the corresponding functionality for an Accessor. Does it exist, or do I have skip using Accessors for this functionality? I agree that this would be really nice to have. One way to work with this for now would be to have your accessor return a Statement, i.e.: @Query("SELECT * FROM ks.tbl WHERE id

I believe I have found a bug with the logic of how a prepared statement is cached in the StatementFactory in the Cassandra csharp driver (version 2.7.3). Here is the use case. Guid key = Guid.NewGuid(); // your key ISession session_foo = new Session("foo"); //This is pseudo code ISession session_bar = new Session("bar"); var foo_mapper = new Mapper(session_foo); //table foo_bar var bar_mapper = new Mapper(session_bar); //table foo_bar await Task.WhenAll( foo_mapper.DeleteAsync<Foo>("WHERE id = ?", key), bar_mapper.DeleteAsync<Bar>("WHERE id = ?", key)); We have found that after running this

I am trying to move all my data from one column-family (table) to the other. Since both the tables have different descriptions, I would have to pull all data from table-1 and create a new object for table-2 and then do a bulk aync insert. My table-1 has millions of records so I cannot get all the data directly in my data structure and work that out. I am looking out for solutions to do that easily using Spring Data Cassandra with Java. I initially planned for moving all the data to a temp table first followed by creating some composite key relations and then querying back my master table.

I got an amazingly siplme java application which I almost copied from this one example: http://markmail.org/download.xqy?id=zua6upabiylzeetp&number=2 All I wanted to do is to read the table data and display in the Eclipse console. My pom.xml: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>chat_connaction_test</groupId> <artifactId>ChatSparkConnectionTest</artifactId> <version>0.0.1-SNAPSHOT<