On 6 Aug 2002, Steve Przepiora wrote:

> Hello,
> I need to write a script to parse the postfix logs, and was wondering
> how unique the hash is in the logs:
>

The queue id is unique for 1 second! It is hex(tv_usec, inode) If an inode
is reused in more than 1 microsecond (practically certain at current disk
and IPC latencies) and less than 1 second the microsecond portion of the
queue id keeps the id distinct from previous uses during the same second.

Every million reuses of the same inode will on average generate a queue id
condition (if the microsecond clock generates a uniform distribution of 1
million values).

I have seen queue id reuse within a single day a server handling 200000
messages a day. This is rare.

The log line:

        postfix/smtpd[pid]: queue_id: client=...
OR
        postfix/pickup[pid]: queue_id: uid=..., from=<...>

corresponds to the first use of a queue id. Any prior use of the queue id
is from a previous message. The queue id corresponds to the same message
until another log line as above indicates a new message with that queue
id.

-- 
	Viktor.
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