Horton

Re: Patch: Write Amplification Reduction Method (WARM)

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Pavan Deolasee <pavan.deolasee@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>, Bruce Momjian <bruce@momjian.us>, Jaime Casanova <jaime.casanova@2ndquadrant.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-03-16T12:53:36Z
Lists: pgsql-hackers 
On Wed, Mar 15, 2017 at 3:44 PM, Pavan Deolasee
<pavan.deolasee@gmail.com> wrote:
> I couldn't find a better way without a lot of complex infrastructure. Even
> though we now have ability to mark index pointers and we know that a given
> pointer either points to the pre-WARM chain or post-WARM chain, this does
> not solve the case when an index does not receive a new entry. In that case,
> both pre-WARM and post-WARM tuples are reachable via the same old index
> pointer. The only way we could deal with this is to mark index pointers as
> "common", "pre-warm" and "post-warm". But that would require us to update
> the old pointer's state from "common" to "pre-warm" for the index whose keys
> are being updated. May be it's doable, but might be more complex than the
> current approach.

/me scratches head.

Aren't pre-warm and post-warm just (better) names for blue and red?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. Implement SortSupport for macaddr data type

  2. Simplify check of modified attributes in heap_update

  3. Remove direct uses of ItemPointer.{ip_blkid,ip_posid}

  4. Fix CatalogTupleInsert/Update abstraction for case of shared indstate.

  5. Provide CatalogTupleDelete() as a wrapper around simple_heap_delete().

  6. Band-aid fix for incorrect use of view options as StdRdOptions.

  7. Update visibility map in the second phase of vacuum.

  8. Avoid having two copies of the HOT-chain search logic.

  9. Postgres95 1.01 Distribution - Virgin Sources