[HBASE-18106] Redo ProcedureInfo and LockInfo

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0-alpha-3, 2.0.0
• Component/s: proc-v2
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Admin.listProcedures and Admin.listLocks were renamed to getProcedures and getLocks (listProcedures was added to hbase 1.2). This change was done in an incompatible way -- we just yanked listProcedures (Because Admin Interface is not compatible with hbase1).

    Main changes:
    - ProcedureInfo and LockInfo were removed, we use JSON instead of them
    - Procedure and LockedResource are their server side equivalent
    - Procedure protobuf state_data became obsolate, it is only kept for
      reading previously written WAL
    - Procedure protobuf contains a state_message field, which stores the internal
      state messages (Any type instead of bytes)
    - Procedure.serializeStateData and deserializeStateData were changed slightly
    - Procedures internal states are available on client side
    - Procedures are displayed on web UI and in shell in the following jruby format:
      { ID => '1', PARENT_ID = '-1', PARAMETERS => [ ..extra state information.. ] }

• Assignee: Balazs Meszaros
• Reporter: Michael Stack
• Created: 24/May/17 23:57
• Updated: 17/Jun/22 18:11
• Resolved: 08/Sep/17 20:18

Description

ProcedureInfo was introduced as a lowest-common-denominator POJO that could be used as a facade on PB Procedures. It was good for showing state of Procedure framework in shell and UI.

Its a bit weird though. Its up in hbase-common rather than in Procedure and it can only ever show a subset of the Procedure info.

I was thinking we could use the pb3.1 pb->JSON utility instead and emit a JSON String wherever we need to export a view on procedure internals.

This issue is about exploring this possibility. Would depend on our having an upgraded guava (so probably depends on the 'pre-build' project).

From ProcedureInfo and LockInfo need fixing in https://docs.google.com/document/d/1eVKa7FHdeoJ1-9o8yZcOTAQbv0u0bblBlCCzVSIn69g/edit#heading=h.kid1jzo114xw

Issue Links

• relates to: HBASE-18367 Reduce ProcedureInfo usage
• relates to: HBASE-16102 Procedure v2 - Print Procedure Graphs
• links to: Review Board (master)