Horton

Re: [HACKERS] Parallel tuplesort (for parallel B-Tree index creation)

Peter Geoghegan <pg@bowt.ie>

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From: Peter Geoghegan <pg@bowt.ie>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Thomas Munro <thomas.munro@enterprisedb.com>, Robert Haas <robertmhaas@gmail.com>, Rushabh Lathia <rushabh.lathia@gmail.com>, Heikki Linnakangas <hlinnaka@iki.fi>, Pg Hackers <pgsql-hackers@postgresql.org>, Corey Huinker <corey.huinker@gmail.com>
Date: 2018-02-02T16:16:50Z
Lists: pgsql-hackers

Attachments

On Mon, Jan 29, 2018 at 4:06 PM, Peter Geoghegan <pg@bowt.ie> wrote:
> On Sat, Jan 27, 2018 at 12:20 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>> I have posted the patch for the above API and posted it on a new
>> thread [1].  Do let me know either here or on that thread if the patch
>> suffices your need?
>
> I've responded to you over on that thread. Thanks again for helping me.
>
> I already have a revision of my patch lined up that is coded to target
> your new WaitForParallelWorkersToAttach() interface, plus some other
> changes.

Attached patch has these changes.

-- 
Peter Geoghegan

Commits

  1. Support parallel btree index builds.

  2. Report an ERROR if a parallel worker fails to start properly.

  3. Transfer state pertaining to pending REINDEX operations to workers.

  4. Add a barrier primitive for synchronizing backends.

  5. Allow DML commands that create tables to use parallel query.

  6. Refactor GetOldestXmin() to use flags

  7. Fix regression in parallel planning against inheritance tables.

  8. Don't create "holes" in BufFiles, in the new logtape code.

  9. Simplify the code for logical tape read buffers.

  10. Fix excessive memory consumption in the new sort pre-reading code.

  11. Implement binary heap replace-top operation in a smarter way.

  12. Cosmetic code cleanup in commands/extension.c.

  13. Speed up planner's scanning for parallel-query hazards.

  14. Read from the same worker repeatedly until it returns no tuple.

  15. Improve tuplesort.c to support variable merge order. The original coding