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  1. HBase
  2. HBASE-1730

Near-instantaneous online schema and table state updates

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.92.0
    • Component/s: None
    • Labels:
      None

      Description

      We should not need to take a table offline to update HCD or HTD.

      One option for that is putting HTDs and HCDs up into ZK, with mirror on disk catalog tables to be used only for cold init scenarios, as discussed on IRC. In this scheme, regionservers hosting regions of a table would watch permanent nodes in ZK associated with that table for schema updates and take appropriate actions out of the watcher. In effect, schema updates become another item in the ToDo list.

      /hbase/tables/<table-name>/schema

      Must be associated with a write locking scheme also handled with ZK primitives to avoid situations where one concurrent update clobbers another.

        Attachments

        1. HBASE-1730-2.patch
          35 kB
          Nicolas Spiegelberg
        2. HBASE-1730.patch
          37 kB
          nileema shingte
        3. 1730-v3.patch
          191 kB
          stack
        4. 1730-v2.patch
          42 kB
          stack
        5. 1730.patch
          30 kB
          stack

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              • Assignee:
                nspiegelberg Nicolas Spiegelberg
                Reporter:
                apurtell Andrew Purtell
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                • Created:
                  Updated:
                  Resolved: