[jira] [Created] (HBASE-22567) HBCK2 addMissingRegionsToMeta

["Wellington Chevreuil (JIRA)" <ji...@apache.org>]

Wellington Chevreuil created HBASE-22567:
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             Summary: HBCK2 addMissingRegionsToMeta
                 Key: HBASE-22567
                 URL: https://issues.apache.org/jira/browse/HBASE-22567
             Project: HBase
          Issue Type: New Feature
            Reporter: Wellington Chevreuil
            Assignee: Wellington Chevreuil


Following latest discussion on HBASE-21745, this proposes an hbck2 command that allows for inserting back regions missing in META that still have *regioninfo* available in HDFS. Although this is still an interactive and simpler version than the old _OfflineMetaRepair_, it still relies on hdfs state as the source of truth, and performs META updates mostly independently from Master (apart from requiring Meta table been online).

For a more detailed explanation on this command behaviour, pasting _command usage_ text:
{noformat}
To be used for scenarios where some regions may be missing in META,
but there's still a valid 'regioninfo' metadata file on HDFS.
This is a lighter version of 'OfflineMetaRepair' tool commonly used for
similar issues on 1.x release line.
This command needs META to be online. For each table name passed as
parameter, it performs a diff between regions available in META,
against existing regions dirs on HDFS. Then, for region dirs with
no matches in META, it reads regioninfo metadata file and
re-creates given region in META. Regions are re-created in 'CLOSED'
state at META table only, but not in Masters' cache, and are not
assigned either. A rolling Masters restart, followed by a
hbck2 'assigns' command with all re-inserted regions is required.
This hbck2 'assigns' command is printed for user convenience.
WARNING: To avoid potential region overlapping problems due to ongoing
splits, this command disables given tables while re-inserting regions.
An example adding missing regions for tables 'table_1' and 'table_2':
$ HBCK2 addMissingRegionsInMeta table_1 table_2
Returns hbck2 'assigns' command with all re-inserted regions.{noformat}



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