[jira] [Assigned] (CASSANDRA-11980) Reads at EACH_QUORUM not respecting the level with read repair or speculative retry active

["Carl Yeksigian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-11980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl Yeksigian reassigned CASSANDRA-11980:
------------------------------------------

    Assignee: Carl Yeksigian

> Reads at EACH_QUORUM not respecting the level with read repair or speculative retry active
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-11980
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11980
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Coordination
>            Reporter: Aleksey Yeschenko
>            Assignee: Carl Yeksigian
>
> {{ReadCallback::waitingFor()}} is not sophisticated enough to correctly count replies from replicas towards {{blockFor}}, and can return to the client before getting an actual quorum in each of the DCs.
> Assume DC1: n1, n2, n3; DC2: n4, n5, n6; blockFor in this case would be 4. {{ReadCallback}} does not count replies from different DCs separately, however, so if the replies return in order of n1, n2, n3, n4, the request will still succeed, having achieved 4, despite not getting a quorum from DC2.
> The bug potentially manifests itself if RR.GLOBAL, RR.LOCAL, or any speculative retry triggers.
> The easiest fix would be to temporarily disable RR and speculative retry on each quorum reads.



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