This bug was fixed in the package cups - 2.2.11-0ubuntu1
---------------
cups (2.2.11-0ubuntu1) eoan; urgency=medium
* New upstream release
* Removed 10 patches taken from upstream.
* Refreshed 13 patches with quilt.
* Removed patch to set "LogDebugHistory 99999" as it causes high
system load when there are very many jobs (LP: #1831021).
* Set "DirtyCleanInterval 0" in CUPS configuration to avoid losses of
jobs when cupsd gets killed (LP: #1830022).
-- Till Kamppeter <[email protected]> Mon, 05 Aug 2019 11:40:10
+0200
** Changed in: cups (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1830022
Title:
DirtyCleanInterval should be 0 by default
Status in cups package in Ubuntu:
Fix Released
Bug description:
Please consider changing DirtyCleanInterval value to 0 as default.
Otherwise if cupsd crashes due to (e.g. OOM killer) under a heavy
workload even hundreds of jobs may be lost. This concern is backed up
by a real-life scenario and leaves the client sending thousands of
jobs unaware that many of them are lost during a crash.
After cupsd gets restarted it rewinds it's job counter to the last
cached and continues unaware about the jobs accepted and lost.
Having DirtyCleanInterval set to 0 will cause some performance impact,
but not significant under lighter workloads and a completely justified
price for reliability under heavy workloads.
Test scenario:
1. sudo apt install printer-driver-cups-pdf
2. while [ 1 ]; do lp -d PDF somepdf.pdf; done;
3. # on other terminal
kill -9 $(pidof cupsd)
4. Note last job number and wait for cupsd to be restarted by systemd.
5. Once accepting jobs is resumend the job counter is rewound.
Expected behavior:
Accepted jobs are queued for processing.
Actual behavior:
Some accepted jobs are lost.
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