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https://issues.apache.org/jira/browse/HBASE-10196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851993#comment-13851993
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Sergey Shelukhin commented on HBASE-10196:
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As far as I understand null means there's no merge.
+1
should Hbck clean up if Janitor didn't as JM says?
> Enhance HBCK to understand the case after online region merge
> -------------------------------------------------------------
>
> Key: HBASE-10196
> URL: https://issues.apache.org/jira/browse/HBASE-10196
> Project: HBase
> Issue Type: Bug
> Reporter: chunhui shen
> Assignee: chunhui shen
> Fix For: 0.96.2, 0.98.1, 0.99.0
>
> Attachments: hbase-10196-trunk.patch
>
>
> HBCK will report an error now after the online merge,
> because the files of merging regions still remain on HDFS which will be
> cleaned by CatalogJanitor later.
> ERROR: Region { meta => null, hdfs =>
> hdfs://hbasetest1:9000/hbase/data/default/dns/c6569a72cc3c2750d14976ab85f02315,
> deployed => } on HDFS, but not listed in hbase:meta or deployed on any
> region server
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