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Teach xlogreader to follow timeline switches

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Uses page-based mechanism to ensure we’re using the correct timeline.

Tests are included to exercise the functionality using a cold disk-level copy
of the master that's started up as a replica with slots intact, but the
intended use of the functionality is with later features.

Craig Ringer, reviewed by Simon Riggs and Andres Freund
This commit is contained in:
Simon Riggs
2017-03-22 07:05:12 +00:00
parent 9ca2dd578d
commit 1148e22a82
7 changed files with 364 additions and 19 deletions
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src/include/access/xlogutils.h
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@@ -52,4 +52,7 @@ extern int read_local_xlog_page(XLogReaderState *state,
XLogRecPtr targetRecPtr, char *cur_page,
TimeLineID *pageTLI);
extern void XLogReadDetermineTimeline(XLogReaderState *state,
XLogRecPtr wantPage, uint32 wantLength);
#endif