Hi, On Tue, Jan 18, 2022 at 02:21:14PM +0800, 陈佳昕(步真) wrote: > > We know that PostgreSQL doesn't support a single relation size over 32TB, > limited by the MaxBlockNumber. But if we just 'insert into' one relation over > 32TB, it will get an error message 'unexpected data beyond EOF in block 0 of > relation' in ReadBuffer_common. The '0 block' is from mdnblocks function > where the segment number is over 256 and make segno * RELSEG_SIZE over > uint32's max value. So is it necessary to make the error message more > readable like 'The relation size is over max value ...' and elog in > mdnblocks?
I didn't try it but this is supposed to be caught by mdextend(): /* * If a relation manages to grow to 2^32-1 blocks, refuse to extend it any * more --- we mustn't create a block whose number actually is * InvalidBlockNumber. (Note that this failure should be unreachable * because of upstream checks in bufmgr.c.) */ if (blocknum == InvalidBlockNumber) ereport(ERROR, (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED), errmsg("cannot extend file \"%s\" beyond %u blocks", relpath(reln->smgr_rnode, forknum), InvalidBlockNumber))); Didn't you hit this?