Hello, gurus,
I faced incorrect checksum on "global/pg_filenode.map" at the right timing
"VACUUM FULL" is executed and session was aborted.
Aug 16 20:51:19 postgres[22329]: [2-1] FATAL: relation mapping file
"global/pg_filenode.map" contains incorrect checksum
Aug 16 20:51:19 postgres[22329]: [2-2] STATEMENT: SELECT
id,readbm,writebm,survbm,timeout FROM Users WHERE username='packetlogicd' AND
password=md5('xxxxx')
I'm reading the comment in src/backend/utils/cache/relmapper.c .
===
Therefore mapped catalogs can only be relocated by operations such as VACUUM
FULL and CLUSTER, which make no transactionally-significant changes: it must be
safe for the new file to replace the old, even if the transaction itself aborts.
===
Does this comment mean it's expected to get this kind of checksum error if the
timing is really bad?
Regards,
Tatsuki
