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6672d79139
When a PostgreSQL instance performing archive recovery but not using standby mode is promoted, and the last WAL segment that it attempted to read ended in a partial record, the previous code would create invalid WAL on the new timeline. The WAL from the previously timeline would be copied to the new timeline up until the end of the last valid record, but instead of beginning to write WAL at immediately afterwards, the promoted server would write an overwrite contrecord at the beginning of the next segment. The end of the previous segment would be left as all-zeroes, resulting in failures if anything tried to read WAL from that file. The root of the issue is that ReadRecord() decides whether to set abortedRecPtr and missingContrecPtr based on the value of StandbyMode, but ReadRecord() switches to a new timeline based on the value of ArchiveRecoveryRequested. We shouldn't try to write an overwrite contrecord if we're switching to a new timeline, so change the test in ReadRecod() to check ArchiveRecoveryRequested instead. Code fix by Dilip Kumar. Comments by me incorporating suggested language from Álvaro Herrera. Further review from Kyotaro Horiguchi and Sami Imseih. Discussion: http://postgr.es/m/CAFiTN-t7umki=PK8dT1tcPV=mOUe2vNhHML6b3T7W7qqvvajjg@mail.gmail.com Discussion: http://postgr.es/m/FB0DEA0B-E14E-43A0-811F-C1AE93D00FF3%40amazon.com |
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