[jira] [Created] (BEAM-11399) Cassandra sessions should be (cached) reused per keyspace per host

["Manoj Kumar Singh (Jira)" <ji...@apache.org>]

Manoj Kumar Singh created BEAM-11399:
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             Summary: Cassandra sessions should be (cached) reused per keyspace per host
                 Key: BEAM-11399
                 URL: https://issues.apache.org/jira/browse/BEAM-11399
             Project: Beam
          Issue Type: Improvement
          Components: io-java-cassandra
            Reporter: Manoj Kumar Singh


According to the Datastax document for session "{color:#4c9aff}*As a given session can only be "logged" into one keyspace at a time (where the "logged" keyspace is the one used by queries that don't explicitly use a fully qualified table name), it can make sense to create one session per keyspace used. This is however not necessary when querying multiple keyspaces since it is always possible to use a single session with fully qualified table names in queries.*{color}"(source: [https://docs.datastax.com/en/drivers/java/3.0/com/datastax/driver/core/Session.html).] 

The session fields in Mutator<T> class should be cached and reused for a keyspace and host. 

[https://github.com/apache/beam/blob/master/sdks/java/io/cassandra/src/main/java/org/apache/beam/sdk/io/cassandra/CassandraIO.java#L1225] 



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