DataStax Enterprise is big data platform consisting of open source tools such as Apache Cassandra, Solr and Hadoop (and several others).

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cqlsh 'Select' statement does not return the data that exists

I have the following Cassandra table:CREATE TABLE myflights.flights_by_airport2 (origin text,dep_time timestamp,fl_date timestamp,airline_id int,carrier text,fl_num int,PRIMARY KEY ((origin), ...
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26 views

How to use Node.js promises for a function (CassandraDB driver when executing query)

I am using client.stream() from Cassandra DB's driver to fetch large result sets using pages, then for each row result returned I am pushing it into an array defined at the top of my scope. After ...
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9 views

Any ramifications with calling DseCluster.init()/close() every minute?

I have a 2-node DC and I’m trying to use the DseCluster object for health checking each node by calling DseCluster.init() and close() after. If init() fails, then I know that node is down. The methods ...
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14 views

Unable to start bin/dse spark-sql. File not exception /tmp/hive

I'am trying to run following command on DSE cassandra :-dse$ bin/dse spark-sqlIt gives following error :-2018-05-24 16:59:41 [main] ERROR o.a.s.d.DseSparkSubmitBootstrapper - Failed to start or ...
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24 views

How do I enable spark-sql on DataStax Version 5.1.7?

I want to use spark-sql in DataStax but it did not start with dse by default.So How do I configure spark-sql in dse 5.1.7?Thanks In Advance.
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20 views

com.datastax.driver.core.Metadata:getHosts() returning incorrect state

Any reason why com.datastax.driver.core.Metadata:getHosts() would return state UP for a host that has shutdown? However, nodetool status returns DN for that host. No matter how many times I check ...
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14 views

How do you display a graph's replication factor in the gremlin-console?

I know for DSE graph, in gremlin-console you can create a graph with replication as followssystem.graph('graph_name').replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3}")But how do you ...
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22 views

Can we split Cassandra Data files?

I am using DataStax version 5.1.7. And I want to create separate data files or directory for each week(7 Days).Means for each week , it should create a separate data file.Is it possible ?Thanks ...
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21 views

Can we create and save dataframe in DSE Spark without enabling hive?

I am using DataStax version 5.1.7. I have disabled Hadoop in DSE. And when I convert an existing rdd into dataframe, then I am getting following error -"com.datastax.bdp.fs.model....
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35 views

Spark SQL Query on DSE Cassandra in Scala

I want to test the Spark-SQL query on DSE Cassandra table in Scala IDE. The query runs flawlessly when the jar file is executed in dse spark-submit.But it gives an error when it runs in Scala IDE....
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31 views

Datastax studio cannot read schema for graph

I have a DSE 6 Cluster in production, everything works great.Lately I wanted to plug the version 6 of datastax studio on it.I configured the connection properly with ssl and authentication and the ...
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38 views

java.lang.RuntimeException: com.datastax.bdp.fs.model.NoSuchFileException: File not found: /tmp/hive/

I have following code :def main(args: Array[String]) {val conf=new SparkConf().setAppName("Fleet").set("spark.executor.memory", "1g").set("spark.driver.memory", "2g").set("spark....
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25 views

DSE SearchAnalytics with Scala error

By refering to this link , I tried to query cassandra table in spark Dataframeval spark=SparkSession.builder().appName("CassandraSpark").config("spark.cassandra....
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32 views

How is Cassandra designed to avoid the need for load balancers?

I read this from the official DSE doc but it did not go in depth in to how. Can someone explain or provide any links to how?
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16 views

Why OpsCenter not showing correct per second no of write for a cassandra table?

I am using OpsCenter version 6.1.6. And I am inserting around 2k rows per second into cassandra table.But When I see on OpsCenter's dashboard then it is showing only 300 writes/per second for a ...

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