f5a03f1afe
Fix memory usage for verifiers. Events to verify were being loaded from the db into an in-memory fifo queue to spool to worker processes. This was not being limited, resulting in a large amount of memory being used if events were read from the DB faster than they were being processed. This change pauses the loading of events if the in-memory queue grows larger than specified batchsize. Also, verifier child processes were not handling signals (like SIGTERM) properly, resulting in them not shutting down properly. Added proper signal handling. Change-Id: Ife25ca07398acf111f4388071b5f2e4eafeecb05
StackTach
StackTach is a debugging / monitoring utility for OpenStack ([Open]StackTach[ometer]). StackTach can work with multiple datacenters including multi-cell deployments.
Watch the video here: http://www.youtube.com/watch?v=pZgwDHZ3wm0
Overview
OpenStack has the ability to publish notifications to a RabbitMQ exchange as they occur. So, rather than pouring through reams of logs across multiple servers, you can now watch requests travel through the system from a single location.
A detailed description of the notifications published by OpenStack is available here