c154f0501c
(Cherry-pick from Release-0.5) The problem was caused by the fact that the eventlet switching occurs not immediately when the event.send() is executed, but in some time afterwards (when some blocking operation is run). This time may be sufficient for the lock to be re-aquired by the same thread. For example, imagine there are two green threads A and B attempting to simultaneously run a method M of the same object. Consider the following scenario: 1) A is executed first and acquires the lock, then executes M 2) B detects that the lock is taken and awaits on the event.wait() 3) A is finished with M, releases the lock and calls event.send() to allow B to proceed 4) Switching does not happen immediately and A proceeds till some blocking operation 5) Switching occurs, B is activated and acquires the lock on M The problem happens because on the step (5) B assumes that the lock was indeed released by A on step (3). However, as some actions may take place during (4), they may include requiring the lock again. B does not recheck this, which causes the twin ownership of the lock. To resolve this B needs to always recheck the lock after re-activating from wait, and, if the lock is still taken, wait again. Closes-Bug: #1316551 Debugging and fixing of this issue required to add some logging, which may be useful for other debugging scenarios: the output contain the information about green-thread id, the method and the object it is run for. So, this partially targets blueprint improve-engine-logging Change-Id: I06ed15a2b3642da2f85a254526638ac05be060ce
Murano
Murano Project introduces an application catalog, which allows application developers and cloud administrators to publish various cloud-ready applications in a browsable categorised catalog, which may be used by the cloud users (including the inexperienced ones) to pick-up the needed applications and services and composes the reliable environments out of them in a "push-the-button" manner.
Project Resources
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License
Apache License Version 2.0 http://www.apache.org/licenses/LICENSE-2.0