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

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

    [ https://issues.apache.org/jira/browse/HBASE-22567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861244#comment-16861244 ] 

Wellington Chevreuil commented on HBASE-22567:
----------------------------------------------

Linking a first PR.

> 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
>            Priority: Major
>
> 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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