Reviewed: https://review.openstack.org/276842 Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=1cafff087194711399ad2a85a9f394f7204d7bdd Submitter: Jenkins Branch: master
commit 1cafff087194711399ad2a85a9f394f7204d7bdd Author: dukhlov <dukh...@mirantis.com> Date: Fri Feb 5 19:25:42 2016 +0200 Remove threading before process forking Forking a process when multiple threads are running is an unsafe operation and could cause a lot of problems because only current thread will continue working in child thread. Any locked by other thread resource will remain locked forever. We faced with this problem during oslo.messaging development and added workaround to hide this problem: https://review.openstack.org/#/c/274255/ I tried to fix this problem in oslo.service: https://review.openstack.org/#/c/270832/ but oslo folks said that this fix is ugly and it is wrong way to add workarounds to common libraries because projects use them incorrectly. I think that is fair. So this patch fixes incorrect usage of oslo libraries. In this patch I extended functionality of NeutronWorker and add there `worker_process_count` parameter which determines how many processes should be spawned for this worker. If `worker_process_count` = 0 - don't create process and spawn thread in scope of current process for worker Then I moved all background tasks to workers and return them by `get_workers` method. start_plugin_workers collects plugin's workers using `get_workers` method and starts in ProcessLauncher first workers with `worker_process_count` > 0 and only after this starts threaded workers by simple Launcher Closes-bug: #1569404 Change-Id: I0544f1d47ae53d572adda872847a56fa0b202d2e ** Changed in: neutron Status: In Progress => Fix Released -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1569404 Title: Remove threading before process forking Status in neutron: Fix Released Bug description: Forking processes when a few threads are already running is potentially unsafe operation and could cause a lot of problems because only current thread will continue working in child thread. Any locked by other thread resource will remain locked forever. We faced with this problem during oslo.messaging development and added workaround to hide this problem: https://review.openstack.org/#/c/274255/ I tried to fix this problem in oslo.service: https://review.openstack.org/#/c/270832/ but oslo folks said that this fix is ugly and it is wrong way to add workarounds to common libraries because projects use them incorrectly. I think that is fare. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1569404/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp