[PATCH 02/14] Add support for a generic wal reading facility dubbed XLogReader

Andres Freund <andres@2ndquadrant.com>

From: Andres Freund <andres@2ndquadrant.com>

To: pgsql-hackers@postgresql.org

Date: 2012-11-15T01:17:02Z

Lists: pgsql-hackers

Attachments

0002-Add-support-for-a-generic-wal-reading-facility-dubbe.patch (text/x-patch) patch 0002

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 →

Background worker processes
- da07a1e85651 9.3.0 cited
Rearrange storage of data in xl_running_xacts.
- 5c11725867ac 9.3.0 cited
Basic binary heap implementation.
- 7a2fe9bd0371 9.3.0 cited
Embedded list interface
- a66ee69add6e 9.3.0 cited
Refactor xlog.c to create src/backend/postmaster/startup.c
- 9aceb6ab3c20 9.2.0 cited