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Perform a lot more sanity checks when freezing tuples.

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The previous commit has shown that the sanity checks around freezing
aren't strong enough. Strengthening them seems especially important
because the existance of the bug has caused corruption that we don't
want to make even worse during future vacuum cycles.

The errors are emitted with ereport rather than elog, despite being
"should never happen" messages, so a proper error code is emitted. To
avoid superflous translations, mark messages as internal.

Author: Andres Freund and Alvaro Herrera
Reviewed-By: Alvaro Herrera, Michael Paquier
Discussion: https://postgr.es/m/20171102112019.33wb7g5wp4zpjelu@alap3.anarazel.de
Backpatch: 9.3-
This commit is contained in:
Andres Freund
2017-11-13 18:45:47 -08:00
parent 9c2f0a6c3c
commit 699bf7d05c
5 changed files with 114 additions and 25 deletions
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2
src/include/access/heapam_xlog.h
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@ -384,6 +384,8 @@ extern XLogRecPtr log_heap_freeze(Relation reln, Buffer buffer,
TransactionId cutoff_xid, xl_heap_freeze_tuple *tuples,
int ntuples);
extern bool heap_prepare_freeze_tuple(HeapTupleHeader tuple,
TransactionId relfrozenxid,
TransactionId relminmxid,
TransactionId cutoff_xid,
TransactionId cutoff_multi,
xl_heap_freeze_tuple *frz,