Warnings in Standby Logs

Hi,

I'm on 9.1.2 and occasionally get what are probably harmless warning
messages in my logs, but because I have the responbility of ensuring we
haven't lost a bit of data between our master and standby, I feel I should
know exactly what they mean. I occasionally see "invalid record length" and
"record with zero length" in my logs, and they almost only occur during
reboots (the "consistent recovery state reached" message gives me the
warm-fuzzy, but then when they're followed by either of those two, it leaves
me wondering). For example, I had to reboot my hot standby twice yesterday:

2012-03-16 10:23:28 CDT LOG: received smart shutdown request
2012-03-16 10:23:28 CDT FATAL: terminating walreceiver process due to
administrator command
2012-03-16 10:27:33 CDT LOG: database system was interrupted while in
recovery at log time 2012-03-16 10:14:15 CDT
2012-03-16 10:27:33 CDT HINT: If this has occurred more than once some data
might be corrupted and you might need to choose an earlier recovery target.
2012-03-16 10:27:33 CDT LOG: entering standby mode
2012-03-16 10:27:34 CDT LOG: redo starts at 9/B98D6968
2012-03-16 10:27:34 CDT LOG: consistent recovery state reached at
9/B9F171B0
2012-03-16 10:27:34 CDT LOG: database system is ready to accept read only
connections
2012-03-16 10:27:34 CDT LOG: invalid record length at 9/B9F85E78
2012-03-16 10:27:34 CDT LOG: streaming replication successfully connected
to primary
2012-03-16 10:28:07 CDT LOG: received smart shutdown request
2012-03-16 10:28:07 CDT FATAL: terminating walreceiver process due to
administrator command
2012-03-16 10:28:07 CDT LOG: shutting down
2012-03-16 10:47:00 CDT LOG: database system was interrupted while in
recovery at log time 2012-03-16 10:14:15 CDT
2012-03-16 10:47:00 CDT HINT: If this has occurred more than once some data
might be corrupted and you might need to choose an earlier recovery target.
2012-03-16 10:47:00 CDT LOG: entering standby mode
2012-03-16 10:47:01 CDT LOG: redo starts at 9/B98D6968
2012-03-16 10:47:02 CDT LOG: consistent recovery state reached at
9/BA2D3490
2012-03-16 10:47:02 CDT LOG: database system is ready to accept read only
connections
2012-03-16 10:47:02 CDT LOG: invalid record length at 9/BA2D3490
2012-03-16 10:47:02 CDT LOG: streaming replication successfully connected
to primary

Is this something I should be concerned about (and even if not, where can I
read about what these mean in detail)?

Also, is there maybe a more elegant shutdown I can use in my Linux shutdown
scripts?

P.S. I have searched the forums and the docs several times, so I apologize
if I missed the answer/tutorial on this somewhere.

Thanks,

Eric Simon

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