>>pg_dump: lost synchronization with server: got message type "5", length
>>The error does not occur always and not always with the same table.
> Oh, that's even more interesting. Is the failure message itself
> consistent --- that is, is it always complaining about "message type 5"
> and the same bizarre length value? The "length" looks like it's really
> ASCII text ("2408" to be specific), so somehow libpq is misinterpreting
> a piece of the COPY datastream as the start of a new message.
The failure looks similarly but the number do not exactly the same:
pg_dump: lost synchronization with server: got message type "4", length
pg_dump: SQL command to dump the contents of table "aggr_max_hour"
failed: PQendcopy() failed.
pg_dump: Error message from server: lost synchronization with server:
got message type "4", length 858863113
pg_dump: The command was: COPY messungen.aggr_max_hour (id, von, wert,
counts) TO stdout;
>>However, the error occurs only on that kind of aggregation tables. There
>>is a cron-job keeping the tables up to date, starting all 10 minutes.
>>The job does delete and inserts on the table. Could this somehow block
>>the dump process? Normally it should not?
> It's hard to see how another backend would have anything to do with
> this, unless perhaps the error is dependent on a particular data value
> that is sometimes present in the table and sometimes not. It looks to
> me like either libpq or the backend is miscounting the number of data
> bytes in the COPY datastream. Would it be possible for you to use a
> packet sniffer to capture the communication between pg_dump and the
> backend? If we could look at exactly what's going over the wire, it
> would help to pin down the blame.
Well, I never used a packet sniffer but if anyone tells me what to
capture, I'd be glad to.
PostgreSQL is really a great piece of software, keep on making it even
Dr. Stefan Holzheu
BITOeK Wiss. Sekretariat
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