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https://issues.apache.org/jira/browse/CASSANDRA-9639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839888#comment-15839888
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Chris Lohfink commented on CASSANDRA-9639:
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The primary ranges will differ based on the keyspace and replication 
strategy/factor. Particularly true of vnode/multi DC environments where the 
TokenMetadata.getPredecessor of each local token is not necessarily the bounds 
of the primary ranges.

> size_estimates is inacurate in multi-dc clusters
> ------------------------------------------------
>
>                 Key: CASSANDRA-9639
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9639
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sebastian Estevez
>            Priority: Minor
>             Fix For: 3.0.x
>
>
> CASSANDRA-7688 introduced size_estimates to replace the thrift 
> describe_splits_ex command.
> Users have reported seeing estimates that are widely off in multi-dc clusters.
> system.size_estimates show the wrong range_start / range_end



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