Sachin Goyal created CASSANDRA-13350:
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Summary: Having utility methods in session object
Key: CASSANDRA-13350
URL: https://issues.apache.org/jira/browse/CASSANDRA-13350
Project: Cassandra
Issue Type: Improvement
Reporter: Sachin Goyal
Data modeling in Cassandra is the key to querying.
Best way to query is to have tables where you always query by primary-key or by
partition-key.
And yet there is no method in the datastax's session object that simplifies
this process.
It would be great to have methods like:
# session.getByPrimaryKey (String tableName, Object []primaryKeys)
# session.getByPartitionKey (String tableName, Object []partitionKeys)
# session.getByPartitionKeys (String tableName, Object [][]partitionKeys) //
Like an in-query
# session.getByPrimaryKeys (String tableName, Object [][]primaryKeys)
The last is an unsupported feature yet in Cassandra but it would be really
awesome to have the same. It would be like a read equivalent of the
batch-statements in read.
Advantages:
# Ease-of-use: User does not have to create a string query or a prepared query.
# User does not have to worry about [using prepared statements with select *
queries|https://docs.datastax.com/en/developer/java-driver/3.1/manual/statements/prepared/#avoid-preparing-select-queries].
I am not yet sure how the driver would handle it but if it can, wow!
# If murmur-3 hashing in the client is same as the cluster, clients can query
just the right node (Better token-aware?)
Tools like Hibernate provide such a feature. Examples:
#
[session.get()|https://www.mkyong.com/hibernate/different-between-session-get-and-session-load/]
and
# [JPA.find|http://www.java2s.com/Code/Java/JPA/GetEntitybyID.htm].
(Please note that these links are just an example, not meant to provide
implementation details or the behavior).
As a feature, *session.getByPrimaryKeys (String tableName, Object
[][]primaryKeys)* should help get a performance boost to the users because it
allows running queries for different partitions in parallel and also allows
getting results from the same partition in one query. We can put this in a
separate JIRA task if it is seen as a useful feature by all.
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