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Peter Somogyi commented on HBASE-21154: --------------------------------------- Using an existing hbase-root directory fails when migrating the data and calling disable on hbase:namespace table. There is a check in disableTable and similarly in deleteTable to verify master is initialized at this point. [1] [1] https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java#L2588-L2591 > Remove hbase:namespace table; fold it into hbase:meta > ----------------------------------------------------- > > Key: HBASE-21154 > URL: https://issues.apache.org/jira/browse/HBASE-21154 > Project: HBase > Issue Type: Improvement > Components: meta > Reporter: stack > Assignee: Duo Zhang > Priority: Major > Fix For: 3.0.0 > > Attachments: HBASE-21154-v1.patch, HBASE-21154-v2.patch, > HBASE-21154-v4.patch, HBASE-21154-v5.patch, HBASE-21154.patch > > > Namespace table is a small system table. Usually it has two rows. It must be > assigned before user tables but after hbase:meta goes out. Its presence > complicates our startup and is a constant source of grief when for whatever > reason, it is not up and available. In fact, master startup is predicated on > hbase:namespace being assigned and will not make progress unless it is up. > Lets just add a new 'ns' column family to hbase:meta for namespace. > Here is a default ns table content: > {code} > hbase(main):023:0* scan 'hbase:namespace' > ROW > COLUMN+CELL > default > column=info:d, timestamp=1526694059106, > value=\x0A\x07default > hbase > column=info:d, timestamp=1526694059461, > value=\x0A\x05hbase > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)