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From "Stefan Miklosovic (Jira)" <>
Subject [jira] [Commented] (CASSANDRA-12774) Expose dc in Unavailable exception errors
Date Tue, 03 Aug 2021 07:42:00 GMT


Stefan Miklosovic commented on CASSANDRA-12774:

[~andrew.tolbert] what version of Cassandra have you seen this problem in?

> Expose dc in Unavailable exception errors
> -----------------------------------------
>                 Key: CASSANDRA-12774
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Legacy/CQL, Legacy/Observability
>            Reporter: Andy Tolbert
>            Priority: Low
> For protocol v5 or later, it could be useful if Unavailable optionally included the DC
that could not meet the CL.  
> For example. if a user has a keyspace with RF of { dc1: 3, dc2: 3 } and they make a query
at {{EACH_QUORUM}} and not enough replicas are available in dc2, an {{UnavailableException}}
will be sent to the client with X available and 2 required, but we don't know which DC failed.
 It looks like {{UnavailableException}} already has a constructor that takes in the DC (see
so this could be feasible.

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