checksum error

I have a master & slave server, in US and India. They are both 1.6.12, but
the slave was 1.5.7 until a few days ago.

The master is at rev 5050, but the slave will only sync up to rev 5045.
Every time it tries to sync 5046, I get a checksum error in the apache
error_log. It says some file fails md5.

In order to figure out where the corruption is, I tried using a svn client,
to simply checkout that file from the master, rev 5044, 5045, 5046. Had no
problem. Correct me if I'm wrong, but, if the corruption were on the
server, I should have gotten the error during that operation, right? Does
the svn sync slave do md5 checksums that the svn client doesn't do?

If I restore the slave from backup, and re-try the sync, it consistently
fails at 5045 trying 5046, and always the same file, and always the same
mismatched checksum.

Since we're drawing the conclusion that the corruption is in the slave, it
must mean that a past rev of something was corrupted and undetected. In
fact, when I upgraded from 1.5.7 to 1.6.12, I did a dump & load. So it
seems, if I had silently corrupted on-disk, I should have discovered the
problem at that time, right? Unless perhaps ... 1.5 didn't do checksums so
the 1.6 dump & load has nothing from the past to verify...

Does 1.6 do some new md5 checksumming that 1.5 didn't do?

Anyway, I'm transferring a new fresh copy of the repo to the slave. I
figure this should fix it. But I'm extremely curious how this all happened.
Received on 2010-10-18 15:31:14 CEST