This may belong in a bug report, but I'll post it here first...
There appears to be a **SERIOUS** problem with using pg_compresslog and
pg_uncompresslog with Postgresql 8.4.2.
Here's my configuration snippet:
full_page_writes = on # recover from partial page writes
wal_buffers = 256kB # min 32kB
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
# - Checkpoints -
checkpoint_segments = 64 # in logfile segments, min 1,
16MB each
#checkpoint_timeout = 5min # range 30s-1h
checkpoint_completion_target = 0.9 # checkpoint target duration,
0.0 - 1.0
#checkpoint_warning = 30s # 0 disables
archive_command = 'test ! -f /dbms/pg_archive/%f.bz2 && pg_compresslog
%p | bzip2 - >/dbms/pg_archive/%f.bz2' #command to use to
archive a logfile segment
All appears to be fine with the writes, and they are being saved off on
the nightly backups without incident.
I take a full dump using the instructions in the documentation and make
sure I copy the proper "must have" file for consistency to be reached.
The problem comes when I try to restore.
recovery_conf contains:
restore_command = '/usr/local/pgsql/recovery.sh %f %p'
And that file contains:
#! /bin/sh
infile=$1
outfile=$2
if test -f /dbms/pg_archive/$infile.bz2
then
bunzip2 -c /dbms/pg_archive/$infile.bz2 |
/usr/local/pgsql/bin/pg_decompresslog - $outfile
exit 0
else
exit 1
fi
==============
The problem is that it appears that some of the segments being saved are
no good! On occasion I get this when trying to restore...
Feb 7 12:43:51 dbms2 postgres[2001]: [210-1] LOG: restored log file
"00000001000001710000009A" from archive
Feb 7 12:43:52 dbms2 postgres[2001]: [211-1] LOG: restored log file
"00000001000001710000009B" from archive
Feb 7 12:43:52 dbms2 postgres[2001]: [212-1] LOG: restored log file
"00000001000001710000009C" from archive
Feb 7 12:43:52 dbms2 postgres[2001]: [213-1] LOG: restored log file
"00000001000001710000009D" from archive
Feb 7 12:43:53 dbms2 postgres[2001]: [214-1] LOG: restored log file
"00000001000001710000009E" from archive
Feb 7 12:43:53 dbms2 postgres[2001]: [215-1] LOG: restored log file
"00000001000001710000009F" from archive
Feb 7 12:43:54 dbms2 postgres[2001]: [216-1] LOG: restored log file
"0000000100000171000000A0" from archive
Feb 7 12:43:54 dbms2 postgres[2001]: [217-1] LOG: restored log file
"0000000100000171000000A1" from archive
Feb 7 12:43:55 dbms2 postgres[2001]: [218-1] LOG: restored log file
"0000000100000171000000A2" from archive
Feb 7 12:43:55 dbms2 postgres[2001]: [219-1] LOG: restored log file
"0000000100000171000000A3" from archive
Feb 7 12:43:56 dbms2 postgres[2001]: [220-1] LOG: restored log file
"0000000100000171000000A4" from archive
Feb 7 12:43:56 dbms2 postgres[2001]: [221-1] LOG: restored log file
"0000000100000171000000A5" from archive
Feb 7 12:43:57 dbms2 postgres[2001]: [222-1] LOG: restored log file
"0000000100000171000000A6" from archive
Feb 7 12:43:57 dbms2 postgres[2001]: [223-1] PANIC: corrupted page
pointers: lower = 772, upper = 616, special = 0
Feb 7 12:43:57 dbms2 postgres[2001]: [223-2] CONTEXT: xlog redo
hot_update: rel 1663/616245/1193269; tid 53/93; new 53/4
Feb 7 12:43:57 dbms2 postgres[2000]: [1-1] LOG: startup process (PID
2001) was terminated by signal 6: Abort trap
Feb 7 12:43:57 dbms2 postgres[2000]: [2-1] LOG: terminating any other
active server processes
Eek.
I assume this means that either A6 or A7 is corrupt. But I have the
file both in the restore AND ON THE MACHINE WHERE IT ORIGINATED:
On the SOURCE machine (which is running just fine):
tickerforum# cksum *171*A[67]*
172998591 830621 0000000100000171000000A6.bz2
1283345296 1541006 0000000100000171000000A7.bz2
And off the BACKUP archive, which is what I'm trying to restore:
# cksum *171*A[67]*
172998591 830621 0000000100000171000000A6.bz2
1283345296 1541006 0000000100000171000000A7.bz2
Identical, says the checksums.
This is VERY BAD - if pg_compresslog is damaging the files in some
instances then ANY BACKUP TAKEN USING THEM IS SUSPECT AND MAY NOT
RESTORE!!!!!!
Needless to say this is a MAJOR problem.
-- Karl Denninger
begin:vcard
fn:Karl Denninger
n:Denninger;Karl
email;internet:karl@xxxxxxxxxxxxx
x-mozilla-html:TRUE
version:2.1
end:vcard
--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
