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ZMailer scheduler files/dirs (picture)
Hello,
Here is a picture about HOW ZMailer's Scheduler
uses files. (Pipe this letter to uudecode, and
you will have a ready to use small PS picture.)
The PROBLEM (well, this one) on Scheduler is that
it has always used filespec derived from THE FIRST
channel/hostinfo/fileinode tuple.
Now assume multiple recipients on the letter:
- Processing of the first finishes, and
scheduler unlinks the file from "scheduler"
subdirs.
- It is time to process the second (simultaneous
channel runner, or some such), but look,
"scheduler/chan/host/12345" is now deleted!
- Scheduler gets non-conforming format message
about the fact, and logs it.
- Message is still to be delivered, and likely
will be, but only after considerable delay.
I am now rewriting the child usage from style of:
"Launch them, feed all processable works,
and close command channel; Wait for termination"
into:
"Start the channel program(s), feed them jobs
one at the time, and accept all processing
status reports for the job before feeding another."
If the system does not have full-duplex pipes (SysV STREAMS
pipe, or socketpair()), it needs two normal pipes..
The channel launch load should decrease, and processing speed
increase..
/Matti Aarnio <mea@nic.funet.fi>
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