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From "Thom Valley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-12104) Handle coalesce efforts for inter-dc traffic discretely from intra-dc traffic
Date Tue, 28 Jun 2016 18:42:56 GMT
Thom Valley created CASSANDRA-12104:
---------------------------------------

             Summary: Handle coalesce efforts for inter-dc traffic discretely from intra-dc
traffic
                 Key: CASSANDRA-12104
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12104
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Thom Valley
            Priority: Minor


In relationship to CASSANDRA-8692, we have discovered that pushing coalescing windows to the
point where they have a positive impact on inter-dc traffic overhead appears to have causes
delays in intra-dc traffic (namely, quorum requests between nodes).  Having the same coalescing
strategy apply to all messages (especially intra-dc request/response messages) seems like
a bad idea.

This was in a 5 DC environment with from 30 to 130 ms of latency between the DCs.  Local network
was entirely unrestricted 10G ethernet.

Being able to apply different coalescing rules to those two classifications of traffic would
allow much more effective tuning of the coalescing strategies, save inter-dc bandwidth while
not having any impact on intra-dc message handling.



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