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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2970) Create separate read repair settings for intra- versus inter- datacenter
Date Sat, 30 Jul 2011 01:04:13 GMT
Create separate read repair settings for intra- versus inter- datacenter
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                 Key: CASSANDRA-2970
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2970
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jeremy Hanna
            Priority: Minor


When doing read repair, it doesn't take into account the datacenter where the replicas are.
 It simply does a repair based on the read repair chance.  Since multi-DC configurations would
benefit from a lower chance between DC, it seems reasonable to have a separate setting for
read repair between DCs than for within the DC.

Perhaps there could be a single property still, which would default both inter and intra for
the sake of simple scenarios and backwards compatibility.  Then if a more specific setting
is specified (read_repair_chance_global or read_repair_chance_local), that would be used.

I'm not sure if this would complicate matters too much, but it builds on CASSANDRA-982 and
CASSANDRA-1530 to help with efficiency between datacenters, especially in the case of an analytics
cluster versus a realtime cluster - making them tunably more independent.

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