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https://issues.apache.org/jira/browse/HBASE-19740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320156#comment-16320156
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Chia-Ping Tsai commented on HBASE-19740:
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The way to resolve this issue is that we should NOT revise the passed error
message. No one can remember the NamespaceExistException will add the extra
description to the passed message..
> Repeated error message for NamespaceExistException
> --------------------------------------------------
>
> Key: HBASE-19740
> URL: https://issues.apache.org/jira/browse/HBASE-19740
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Minor
> Attachments: 19740.v1.txt
>
>
> The following can be observed in TestAsyncNamespaceAdminApi test output:
> {code}
> 2018-01-09 07:55:08,685 INFO [Default-IPC-NioEventLoopGroup-5-2]
> client.RawAsyncHBaseAdmin$NamespaceProcedureBiConsumer(2374): Operation:
> CREATE_NAMESPACE, Namespace: TestNamespacens1 failed with Namespace Namespace
> TestNamespacens1 already exists already exists
> {code}
> This was due to ForeignExceptionUtil.toIOException() recreating
> NamespaceExistException, resulting in "already exists" appended one more time.
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