RE: errlogXXX functions and behavior

["Jeff Hill" <johill@lanl.gov>]

Hell Andrei,

Thanks for your bug report. I created Mantis Entry 209 to tack this issue.

> hebt-diag-ioc-blm1>log client: lost contact with log server at
> "172.31.72.101:6500" because "S_errno_EPIPE"
> log client: connected to error message log server at "172.31.72.101:6500"
> - I don't see anything in errorLog file!

The log client checks its circuit with the log server only when there is a
message to send. So, in this case, I presume that the log server was
restarted and that the client, trying to communicate over a defunct circuit,
discovered a disconnect. When there is a disconnect all pending messages are
discarded.

> One more time but without "n"
> hebt-diag-ioc-blm1>errlogMessage("Third")
> Thirdvalue = 0 = 0x0
> I see response from errorLog file
> hebt-diag-ioc-blm1.ics.sns.gov: Wed Jul 13 11:38:32 2005 Thirdd+N

This will need to be investigated.

> 3. If I don't use errlogMessage with "\n" all time I see very strange.
> At first, I don't see error message from item 1. At second, I see
> response from errorLog file each time when buffer is full (~1280).

The log server works this way by design - it does not flush its internal
buffer to the file until it sees a '\n'. This behavior is tended to prevent
output from multiple clients (IOCs) from getting mixed together.

Jeff

> -----Original Message-----
> From: Liyu, Andrei [mailto:liyua@ornl.gov]
> Sent: Wednesday, July 13, 2005 9:54 AM
> To: tech-talk@aps.anl.gov
> Subject: errlogXXX functions and behavior
> 
> 
> Hi,
> 
> 1. When I use errlogMessage first time then
> 
> - I see on terminal
> 
> hebt-diag-ioc-blm1>errlogMessage("First+N\n")
> First+N
> value = 0 = 0x0
> hebt-diag-ioc-blm1>log client: lost contact with log server at
> "172.31.72.101:6500" because "S_errno_EPIPE"
> log client: connected to error message log server at
> "172.31.72.101:6500"
> 
> - I don't see anything in errorLog file!
> 
> 2. Then I type again
> hebt-diag-ioc-blm1>errlogMessage("Second+N\n")
> Second+N
> value = 0 = 0x0
> I see response from errorLog file
> hebt-diag-ioc-blm1.ics.sns.gov: Wed Jul 13 11:38:02 2005 Second+N
> 
> One more time but without "\n"
> hebt-diag-ioc-blm1>errlogMessage("Third")
> Thirdvalue = 0 = 0x0
> I see response from errorLog file
> hebt-diag-ioc-blm1.ics.sns.gov: Wed Jul 13 11:38:32 2005 Thirdd+N
> 
> I suppose this is not ioc that errlog server! If I reboot IOC I see the
> same tail from buffer.
> 
> 3. If I don't use errlogMessage with "\n" all time I see very strange.
> At first, I don't see error message from item 1. At second, I see
> response from errorLog file each time when buffer is full (~1280).
> 
> 4. Of course, I don't refuse to see a little smart client for text file.
> Where I can choice message by ioc name, system/subsystem/module name and
> so on. And maybe it will work from buffer ... :-)
> 
> Have a good day, Andrei Liyu