[CalendarServer-dev] 4.2 server stuck after DB outage

Axel Rau Axel.Rau at Chaos1.DE
Mon Apr 22 03:39:30 PDT 2013

PostgreSQL backend did a fast shutdown due to software update.
After reconnection, caldavd throws
Followed by
twisted/internet/defer.py", line 551, in _runCallbacks
	current.result = callback(current.result, *args, **kw)
twext/web2/server.py", line 643, in _processingReallyFailed
twext/web2/http.py", line 505, in writeResponse
    d = stream.StreamProducer(response.stream).beginProducing(self.chanRequest)
twext/web2/stream.py", line 750, in beginProducing
    self.consumer.registerProducer(self, True)
twext/web2/channel/http.py", line 707, in registerProducer
    raise ValueError, "registering producer %s before previous one
    	(%s) was unregistered" % (producer, self.producer)
	exceptions.ValueError: registering producer <twext.web2.stream.StreamProducer
		object at 0x808dd4d90> before previous one
			(<twext.web2.stream.StreamProducer object at 0x808564510>) was unregistered
Followed by
twext/enterprise/adbapi2.py", line 230, in _reallyExecSQL
txdav/base/datastore/dbapiclient.py", line 76, in execute
    self.realCursor.execute(sql, args)
pgdb.py", line 323, in execute
    return self.executemany(operation, [params])
pgdb.py", line 338, in executemany
pg.ProgrammingError: FATAL:  terminating connection due to administrator command
SSL connection has been closed unexpectedly
Repeated several times.
There was no indication about malfunction to clients.
While shutting down caldavd, I saw 10 disconnects in the PostgreSQL log.

PS: detailed log available on request
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