Piotr Kołaczkowski created CASSANDRA-9603:
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Summary: Expose private listen_address in system.local
Key: CASSANDRA-9603
URL: https://issues.apache.org/jira/browse/CASSANDRA-9603
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Piotr Kołaczkowski
We had some hopes CASSANDRA-9436 would add it, yet it added rpc_address instead
of both rpc_address *and* listen_address. We really need listen_address here,
because we need to get information on the private IP C* binds to. Knowing this
we could better match Spark nodes to C* nodes and process data locally in
environments where rpc_address != listen_address like EC2.
See, Spark does not know rpc addresses nor it has a concept of broadcast
address. It only knows the hostname / IP its workers bind to. In case of cloud
environments, these are private IPs. Now if we give Spark a set of C* nodes
identified by rpc_addresses, Spark doesn't recognize them as belonging to the
same cluster. It treats them as "remote" nodes and has no idea where to send
tasks optimally.
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