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https://issues.apache.org/jira/browse/HBASE-17295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908244#comment-16908244
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Esteban Gutierrez commented on HBASE-17295:
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We run into something very similar recently with one of our users.
[~baibaichen], even it has been a long time, can you confirm if the issue was
caused by hbck? Thanks.
> The namespace table has two regions
> -----------------------------------
>
> Key: HBASE-17295
> URL: https://issues.apache.org/jira/browse/HBASE-17295
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Chang chen
> Priority: Major
> Attachments: bug.PNG
>
>
> From the codes, hbase namespace meta table should not allowed to be split.
> {code:title=HRegion#checkSplit}
> public byte[] checkSplit() {
> // Can't split META
> if (this.getRegionInfo().isMetaTable() ||
>
> TableName.NAMESPACE_TABLE_NAME.equals(this.getRegionInfo().getTable())) {
> if (shouldForceSplit()) {
> LOG.warn("Cannot split meta region in HBase 0.20 and above");
> }
> return null;
> }
> //.....
> }
> {code}
> But recently, I see two namespace regions in our production deployment. It
> may be cased by restarting when cluster is in certain state.
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