Reset lastOverflowedXid on standby when needed Currently, lastOverflowedXid is never reset. It's just adjusted on new transactions known to be overflowed. But if there are no overflowed transactions for a long time, snapshots could be mistakenly marked as suboverflowed due to wraparound.
This commit fixes this issue by resetting lastOverflowedXid when needed altogether with KnownAssignedXids. Backpatch to all supported versions. Reported-by: Stan Hu Discussion: https://postgr.es/m/CAMBWrQ%3DFp5UAsU_nATY7EMY7NHczG4-DTDU%3DmCvBQZAQ6wa2xQ%40mail.gmail.com Author: Kyotaro Horiguchi, Alexander Korotkov Reviewed-by: Stan Hu, Simon Riggs, Nikolay Samokhvalov, Andrey Borodin, Dmitry Dolgov Branch ------ REL9_6_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/7381b79ade479de5038ad924fbff1c584a0d6fee Modified Files -------------- src/backend/storage/ipc/procarray.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-)
