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[PATCH 3/8] Add support for a generic wal reading facility dubbed XLogReader

Andres Freund <andres@2ndquadrant.com>

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From: Andres Freund <andres@2ndquadrant.com>
To: Andres Freund <andres@2ndquadrant.com>, pgsql-hackers@postgresql.org, Robert Haas <robertmhaas@gmail.com>, Kevin Grittner <Kevin.Grittner@wicourts.gov>, Alvaro Herrera <alvherre@2ndquadrant.com>, Simon Riggs <simon@2ndquadrant.com>
Date: 2012-09-15T00:39:30Z
Lists: pgsql-hackers

Attachments

Features:
- streaming reading/writing
- filtering
- reassembly of records

Reusing the ReadRecord infrastructure in situations where the code that wants
to do so is not tightly integrated into xlog.c is rather hard and would require
changes to rather integral parts of the recovery code which doesn't seem to be
a good idea.

Missing:
- "compressing" the stream when removing uninteresting records
- writing out correct CRCs
- separating reader/writer
---
 src/backend/access/transam/Makefile     |    2 +-
 src/backend/access/transam/xlogreader.c | 1032 +++++++++++++++++++++++++++++++
 src/include/access/xlogreader.h         |  264 ++++++++
 3 files changed, 1297 insertions(+), 1 deletion(-)
 create mode 100644 src/backend/access/transam/xlogreader.c
 create mode 100644 src/include/access/xlogreader.h

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Move "hot" members of PGPROC into a separate PGXACT array.