blueprint <multi-process-api-service>

Add multiprocess support for API serivces (EC2/OSAPI_Compute/OSAPI_Volume/Metadata).

2012-06-1 v7:
    * Add unittest to cover worker recovery, service termination functionality
    in wsgi.py, fix python 2.6 compatibility issue.
    * Modify generate_uid() to introduce per-process seeds in utils.py to avoid
    collisions.
    * Add worker session to nova.conf.sample.
2012-05-21 v6:
    * Fix 'test_wsgi' unittest error.
2012-04-28 v5:
    * Add SIGINT handler and fix child-parent race condition when Ctrl+C is
    pressed.
2012-03-31 v4:
    * Fixed typo, removed debug code.
2012-03-30 v3:
    * Fixed localization/pep8 error in unittest, add metadata test.
    * nova/wsgi.py:Server: use the greenthread pool created for each process.
    * nova/service.py: remove debug code
2012-03-27 v2:
    * Fixed unittest error.
    * nova/wsgi.py:Server: Use self._logger to do logging in multiprocess mode.
    * nova/wsgi.py:Server: Move self._pool creation into proper place.
    * code style fix.
2012-03-25 v1:
    * Modification to nova/service.py and nova/wsgi.py in order to support
    multiprocess (a.k.a. workers) for various API services.  If multiprocess
    mode is enabled, (i.e. flags 'APINAME_workers' set to positive numbers),
    corresponding API service will run in target number of process(es). There
    is also a master_worker process spawned for managing all workers (handling
    signal/termination).
    * Add unittest for multiprocess API service, also alter testing/runner.py
    to adopt new unittest.

Change-Id: Ia045e595543ddfd192894b2a05801cc4b7ca90cb

Authors

@@ -213,6 +213,7 @@ Yun Mao <yunmao@gmail.com>
 Yun Shen <Yun.Shen@hp.com>
 Yuriy Taraday <yorik.sar@gmail.com>
 Zed Shaw <zedshaw@zedshaw.com>
+Zhiteng Huang <zhiteng.huang@intel.com>
 Zhixue Wu <Zhixue.Wu@citrix.com>
 Zhongyue Luo <lzyeval@gmail.com>
 Ziad Sawalha <github@highbridgellc.com>

bin/nova-api

@@ -24,7 +24,7 @@ Starts both the EC2 and OpenStack APIs in separate greenthreads.
 """
 
 import eventlet
-eventlet.monkey_patch()
+eventlet.monkey_patch(os=False)
 
 import os
 import sys

bin/nova-api-ec2

@@ -20,7 +20,7 @@
 """Starter script for Nova EC2 API."""
 
 import eventlet
-eventlet.monkey_patch()
+eventlet.monkey_patch(os=False)
 
 import os
 import sys

bin/nova-api-metadata

@@ -20,7 +20,7 @@
 """Starter script for Nova Metadata API."""
 
 import eventlet
-eventlet.monkey_patch()
+eventlet.monkey_patch(os=False)
 
 import os
 import sys

bin/nova-api-os-compute

@@ -20,7 +20,7 @@
 """Starter script for Nova OS API."""
 
 import eventlet
-eventlet.monkey_patch()
+eventlet.monkey_patch(os=False)
 
 import os
 import sys

bin/nova-api-os-volume

@@ -20,7 +20,7 @@
 """Starter script for Nova OS API."""
 
 import eventlet
-eventlet.monkey_patch()
+eventlet.monkey_patch(os=False)
 
 import os
 import sys

nova/testing/runner.py

@@ -366,5 +366,5 @@ def run():
 
 
 if __name__ == '__main__':
-    eventlet.monkey_patch()
+    eventlet.monkey_patch(os=False)
     run()