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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-2970) Create separate read repair settings for intra- versus inter- datacenter
Date Sat, 30 Jul 2011 01:34:09 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-2970.
---------------------------------------

    Resolution: Duplicate

duplicate of CASSANDRA-2506

> Create separate read repair settings for intra- versus inter- datacenter
> ------------------------------------------------------------------------
>
>                 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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