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| author | Thomas Munro | 2018-06-26 06:23:17 +0000 |
|---|---|---|
| committer | Thomas Munro | 2018-06-26 06:23:17 +0000 |
| commit | 12f7d91994d15d362384be46eec92498bdc001c6 (patch) | |
| tree | a1fee728ee3c2d66e2dc063285a78b691d493693 /doc/src | |
| parent | f53ed82b7feeb1eee7388a24aa792e1d1b33e650 (diff) | |
Move RecoveryLockList into a hash table.
Standbys frequently need to release all locks held by a given xid.
Instead of searching one big list linearly, let's create one list
per xid and put them in a hash table, so we can find what we need
in O(1) time.
Earlier analysis and a prototype were done by David Rowley, though
this isn't his patch.
Back-patch all the way.
Author: Thomas Munro
Diagnosed-by: David Rowley, Andres Freund
Reviewed-by: Andres Freund, Tom Lane, Robert Haas
Discussion: https://postgr.es/m/CAEepm%3D1mL0KiQ2KJ4yuPpLGX94a4Ns_W6TL4EGRouxWibu56pA%40mail.gmail.com
Discussion: https://postgr.es/m/CAKJS1f9vJ841HY%3DwonnLVbfkTWGYWdPN72VMxnArcGCjF3SywA%40mail.gmail.com
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