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https://issues.apache.org/jira/browse/HBASE-9573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555241#comment-17555241
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Geoffrey Jacoby commented on HBASE-9573:
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As of HBase 2.3 it's possible to use the listNamespaces method on Admin to
achieve this without an exception (though it's O(N) where N is the number of
namespaces)
> provide namespaceExists api
> ---------------------------
>
> Key: HBASE-9573
> URL: https://issues.apache.org/jira/browse/HBASE-9573
> Project: HBase
> Issue Type: Improvement
> Reporter: Francis Christopher Liu
> Priority: Major
>
> Presently in order to test existence of a namespace one has to use the get
> api and catch the NamespaceNotFound exception. This is undersirable.
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