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https://issues.apache.org/jira/browse/CASSANDRA-12774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17392065#comment-17392065
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Stefan Miklosovic commented on CASSANDRA-12774:
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[~andrew.tolbert] what version of Cassandra have you seen this problem in?
> Expose dc in Unavailable exception errors
> -----------------------------------------
>
> Key: CASSANDRA-12774
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12774
> 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
> [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/exceptions/UnavailableException.java#L33])
> so this could be feasible.
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