We are running 4.0.20 on two servers (AMD Opteron and Xeon).
Our slave has died twice in the last month with the following error:
"Could not parse relay log event entry. The possible reasons are: the
master's binary log is corrupted (you can check this by running
'mysqlbinlog' on the binary log), the slave's relay log is corrupted
(you can check this by running 'mysqlbinlog' on the relay log), a
network problem, or a bug in the master's or slave's MySQL code. If you
want to check the master's binary log or slave's relay log, you will be
able to know their names by issuing 'SHOW SLAVE STATUS' on this slave."
I've tried "resetting" replication by setting the master log file and
position to the values that are given by "show slave status" in case it
was a network hiccup, but the same error.
After I did this, the slave's binary log file shows,
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
# at 4
#691231 16:00:00 server id 1 log_pos 0 Rotate to
colossus-bin.030 pos: 12435199
# at 47
#691231 16:00:00 server id 1 log_pos 0 Rotate to
colossus-bin.030 pos: 12435199
So I went to the master, and turned the binary log into a text file
using mysqlbinlog and scanned by hand the approximate time it died; I
didn't see anything particularily interesting.
I then use mysqlbinlog with the -j option (to start parsing at a
particular spot; in this case, 12435199). The error I got was,
ERROR: Error in Log_event::read_log_event(): 'Event too big', data_len:
1701209458, event_type: 44
Could not read entry at offset 12435199:Error in log format or read error
Googling on some of the phrases in that error message didn't turn up
much, other than it could be potentially be a hardware or
disk-controller issue (we are using 3ware, self-built drivers)....
Anyone have any thoughts? This has been fairly recent (we had some
max-allowed-packet issues till I bumped that up and reduced the size of
the binary logs). The hardware and software has been in place nearly a
year (except the kernel, which we bumped up to try to get around
corruption in the Innodb data files on the Opteron master).
David
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