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https://issues.apache.org/jira/browse/CASSANDRA-11980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Shuler updated CASSANDRA-11980:
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Fix Version/s: (was: 3.9)
3.8
> 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
> Fix For: 3.0.9, 3.8
>
>
> {{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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