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[Mark Sapiro]

Mark Sapiro wrote:

>Elizabeth Schwartz wrote:
>>
>>Having cleaned that out, it sounds like  I then proceeded to trash
>>an afternoon's worth of messages by trying to flush the queue incorrectly.
>
>
>I'm afraid so.


In case anyone is interested in the details, what actually happened
when you ran bin/unshunt against qfiles/out is unshunt processed each
queue entry as follows:

It looked for the "original queue". This is placed in the message
metadata by the shunting process to tell unshunt to which queue to
restore the entry. Since the message was never shunted, there was no
"original queue" so unshunt put it in the default 'in' queue. There it
was picked up by IncomingRunner. Now the issue is that the message
metadata in the queue entry has a 'pipeline' attribute which happens
to be the empty list because when it was previously passed to the
ToOutgoing handler, that was the last entry that was popped off the
list leaving the list empty. Then, IncomingRunner proceeded to pass
the message through the empty pipeline and was immediately finished
without doing anything.

Thus, the messages were all moved from the 'out' queue to the 'in'
queue where IncomingRunner effectively recognized that it had already
completely processed the message so this time it discarded the queue
entry without doing anything.

The moral is "don't unshunt anything which wasn't shunted to begin
with".

-- 
Mark Sapiro <msapiro at value.net>       The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan