Hi,

We are currently using spark to join data in Cassandra and then write the results back into Cassandra. While reads happen with out any error during the writes we see many exceptions like below. Our environment details are:

- Spark v 1.1.0
- spark-cassandra-connector-java_2.10 v 1.1.0

We are using below settings for the writer

spark.cassandra.output.batch.size.rows=1

spark.cassandra.output.concurrent.writes=1

com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: [] - use getErrors() for details)

at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:108)

at com.datastax.driver.core.RequestHandler$1.run(RequestHandler.java:179)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)

Thanks

Ankur