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https://issues.apache.org/jira/browse/HBASE-22567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878827#comment-16878827
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Daisuke Kobayashi commented on HBASE-22567:
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Well, even there's no entry in ZK, it looks master can correct hbase:meta,
regarding tables, upon starting. Here's my observation (the last commit of my
build was 302a9ce0564a796ef59c74fe475984cb3693801a). Suppose hbase:meta is
missing a given table's row, 'dice' in this example, with some reason whereas
HDFS has the data.
If the table's znode is not present in ZK, master actually does put the entry
based on the HDFS info.
{code:java}
2019-07-05 02:13:14,815 WARN [master/192.168.3.5:16000:becomeActiveMaster]
master.TableStateManager: dice has no table state in hbase:meta, assuming
ENABLED
2019-07-05 02:13:15,004 INFO [master/192.168.3.5:16000:becomeActiveMaster]
hbase.MetaTableAccessor: Updated tableName=dice, state=ENABLED in hbase:meta
{code}
On the other hand, if the table's znode exists in ZK, master puts the entry
based on the ZK info.
{code:java}
2019-07-05 02:19:02,182 INFO [master/192.168.3.5:16000:becomeActiveMaster]
master.TableStateManager: Migrating table state from zookeeper to hbase:meta;
tableName=dice, state=ENABLED
{code}
Correct me if I'm wrong.
> 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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