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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14407) Transient Replication: Add support for correct reads when transient replication is in use
Date Mon, 30 Jul 2018 16:43:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16562117#comment-16562117
] 

Ariel Weisberg commented on CASSANDRA-14407:
--------------------------------------------

Note here, that speculative retry for writes doesn't have a separate config option, it uses
the same config as read. We should evaluate if that is a good idea.

> Transient Replication: Add support for correct reads when transient replication is in
use
> -----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14407
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14407
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Coordination
>            Reporter: Ariel Weisberg
>            Assignee: Blake Eggleston
>            Priority: Major
>             Fix For: 4.0
>
>
> Digest reads should never be sent to transient replicas.
> Mismatches with results from transient replicas shouldn't trigger read repair.
> Read repair should never attempt to repair a transient replica.
> Reads should always include at least one full replica. They should also prefer transient
replicas where possible.
> Range scans must ensure the entire scanned range performs replica selection that satisfies
the requirement that every range scanned includes one full replica.



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