[jira] [Updated] (CASSANDRA-2506) Push read repair setting down to the DC-level

["Jonathan Ellis (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-2506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-2506:
--------------------------------------

    Affects Version/s:     (was: 1.0.1)
        Fix Version/s:     (was: 1.0.7)
                       1.1

{quote}
Basically there has been 2 proposition of enhancements for RR on this ticket:

# Being able to completely exlude a given DC of any RR
# Have a different chance of repair for intra-DC and inter-DC RR
{quote}

You're right.  I think what we really want is (2) ... on a per-DC basis.  That is, DC A might want intra-DC RR chance at X and cross-DC chance at Y, but DC B might want them at V and W.

Looking back, I think the main problem with the initial patch was the poorly defined interation between global read_repair_chance and per-DC settings.  In which case, dropping the global r_r_c seems like a reasonable simplification, especially as part of 1.1 (which is where we should be doing new features anyway).

If we think per-DC settings are too complicated in any form, then I'd be okay with the different-cross-DC chance approach as an 80% solution.
                
> Push read repair setting down to the DC-level
> ---------------------------------------------
>
>                 Key: CASSANDRA-2506
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2506
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Brandon Williams
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.1
>
>         Attachments: 0001-dc-localized-read-repair-v2.patch, 0001-dc-localized-read-repair.patch, 0001-documentation-for-read_repair-v4.patch, 0001-thrift-and-avro-changes-v3.patch, 0002-dc-localized-read-repair-v3.patch, 0002-thrift-and-avro-v2.patch, 0002-thrift-and-avro-v4.patch, 0002-thrift-and-avro.patch, 0003-dc-localized-read-repair-v4.patch, 0003-documentation-for-read_repair-v3.patch, 0003-documentation-for-read_repair_options-v2.patch, 0003-documentation-for-read_repair_options.patch
>
>
> Currently, read repair is a global setting.  However, when you have two DCs and use one for analytics, it would be nice to turn it off only for that DC so the live DC serving the application can still benefit from it.

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