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Re: [hylafax-users] Blocked by concurrent call problem since upgrade to 4.2.2



Jordan Kojouharov wrote:


Lee, thank you for the quick and detailed response.


As a follow up to this, some more testing suggests that this only happens for me when the following conditions are true:

1. there are two or more jobs to the same destination already in the outgoing queue, with one of them sending, and the others 'blocked by concurrent'.

2. then, a few more jobs for that destination get submitted, and HylaFAX attemps to batch them, however, resulting in two or more of them going into 'blocked by concurrent', and never unblocking, even after the current sends to that destination get completed.


I cannot reproduce this on my machine with current CVS HEAD. This is what I do:

 echo test | sendfax -n -d 400
 (wait a second as faxq pulls that in)
 echo test | sendfax -n -d 400
 echo test | sendfax -n -d 400
 (these last two are blocked, as expected)
 (wait about 30 seconds)
 echo test | sendfax -n -d 400 -d 400 -d 400
 (these three are blocked, as expected)
 (the first job finishes)
 (faxq then queues-up all of the other jobs in one batch)

All of this is as expected. Again, some of this changed between 4.2.2 and now in CVS, and I suspect that whatever error there was it is now fixed. So you could help by testing current CVS HEAD. Does my procedure produce the problem for you? (400 is a local number on my PBX.)

'man hylafax-config' does seem to indicate that the default value for MaxBatchJobs is 1. Not sure if the man page is wrong, or I'm reading it wrong:

MaxBatchJobs integer 1 max jobs in a batch

The maximum number of jobs to batch together. Fax Batching is an advanced feature that has some rough edges. It is not currently considered fully supported, but in limited situations works well. Enabling this on a server where you don't have total faith in your users could have serious undesired affects.


Oh my. Well, it looks like some of that person's bias against batching still slipped in to the 4.2.2 release documentation, now didn't it?

For the whole story see:

http://bugs.hylafax.org/bugzilla/show_bug.cgi?id=667

I'll get that documentation fixed for the next release.

Lee.


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