Build manager cleanup and more logging

buildman/manager/ephemeral.py

@@ -25,6 +25,7 @@ logger = logging.getLogger(__name__)
 
 ETCD_MAX_WATCH_TIMEOUT = 30
 RETRY_IMMEDIATELY_TIMEOUT = 0
+NO_WORKER_AVAILABLE_TIMEOUT = 10
 DEFAULT_EPHEMERAL_API_TIMEOUT = 20
 
 EXECUTORS = {
@@ -317,12 +318,12 @@ class EphemeralBuilderManager(BaseManager):
       logger.exception('Exception when reading job count from etcd for job: %s', build_uuid)
       raise Return(False, RETRY_IMMEDIATELY_TIMEOUT)
 
-    logger.debug('Total jobs: %s', workers_alive)
+    logger.debug('Total jobs (scheduling job %s): %s', build_uuid, workers_alive)
 
     if workers_alive >= allowed_worker_count:
       logger.info('Too many workers alive, unable to start new worker for build job: %s. %s >= %s',
                   build_uuid, workers_alive, allowed_worker_count)
-      raise Return(False, RETRY_IMMEDIATELY_TIMEOUT)
+      raise Return(False, NO_WORKER_AVAILABLE_TIMEOUT)
 
     job_key = self._etcd_job_key(build_job)
 
@@ -358,8 +359,9 @@ class EphemeralBuilderManager(BaseManager):
       raise Return(False, RETRY_IMMEDIATELY_TIMEOUT)
 
     started_with_executor = None
-    logger.debug("executors are: %s", self._executors)
+    builder_id = None
 
+    logger.debug("Registered executors are: %s", [ex.__class__.__name__ for ex in self._executors])
     for executor in self._executors:
       executor_type = executor.__class__.__name__
 
@@ -372,27 +374,37 @@ class EphemeralBuilderManager(BaseManager):
 
       # Check if we can use this executor based on the retries remaining.
       if executor.minimum_retry_threshold > build_job.retries_remaining:
-        logger.debug('Job %s cannot use executor %s due to not meeting retry threshold', build_uuid,
+        logger.debug('Job %s cannot use executor %s as it is below retry threshold (retry #: %s)',
-                     executor_type)
+                     build_uuid, executor_type, build_job.retries_remaining)
         continue
 
-      logger.debug('Starting builder for job: %s with executor: %s', build_uuid, executor_type)
+      logger.debug('Starting builder for job %s with selected executor: %s', build_uuid,
+                    executor_type)
 
       try:
         builder_id = yield From(executor.start_builder(realm, token, build_uuid))
-        metric_queue.put_deprecated('EphemeralBuilderStarted', 1, unit='Count')
-        metric_queue.ephemeral_build_workers.Inc(labelvalues=[builder_id, build_uuid])
-        started_with_executor = executor
-        break
       except:
         logger.exception('Exception when starting builder for job: %s', build_uuid)
         continue
 
+      try:
+        metric_queue.put_deprecated('EphemeralBuilderStarted', 1, unit='Count')
+        metric_queue.ephemeral_build_workers.Inc(labelvalues=[builder_id, build_uuid])
+      except:
+        logger.exception('Exception when writing start metrics for builder %s for job %s',
+                         builder_id, build_uuid)
+
+      started_with_executor = executor
+
+      # Break out of the loop now that we've started a builder successfully.
+      break
+
     if started_with_executor is None:
       logger.error('Could not start ephemeral worker for build %s', build_uuid)
       raise Return(False, self._ephemeral_api_timeout)
 
-    logger.debug('Started builder for job: %s with executor: %s', build_uuid, executor_type)
+    logger.debug('Started builder with ID %s for job: %s with executor: %s', builder_id, build_uuid,
+                 started_with_executor.__class__.__name__)
 
     # Store the builder in etcd associated with the job id
     try:
@@ -423,6 +435,9 @@ class EphemeralBuilderManager(BaseManager):
       raise Return(False, setup_time)
 
     self._job_to_executor[builder_id] = started_with_executor
+
+    logger.debug('Builder spawn complete for job %s using executor %s with ID %s ', build_uuid,
+                 started_with_executor.__class__.__name__, builder_id)
     raise Return(True, None)
 
   @coroutine

buildman/manager/executor.py

@@ -136,7 +136,7 @@ class EC2Executor(BuilderExecutor):
       coreos_ami = yield From(self._loop.run_in_executor(None, get_ami_callable))
 
     user_data = self.generate_cloud_config(realm, token, channel, self.manager_hostname)
-    logger.debug('Generated cloud config: %s', user_data)
+    logger.debug('Generated cloud config for build %s: %s', build_uuid, user_data)
 
     ec2_conn = self._get_conn()
 
@@ -180,6 +180,10 @@ class EC2Executor(BuilderExecutor):
 
     launched = AsyncWrapper(reservation.instances[0])
 
+    # Sleep a few seconds to wait for AWS to spawn the instance.
+    yield From(trollius.sleep(_TAG_RETRY_SLEEP))
+
+    # Tag the instance with its metadata.
     for i in range(0, _TAG_RETRY_COUNT):
       try:
         yield From(launched.add_tags({
@@ -191,7 +195,8 @@ class EC2Executor(BuilderExecutor):
       except boto.exception.EC2ResponseError as ec2e:
         if ec2e.error_code == 'InvalidInstanceID.NotFound':
           if i < _TAG_RETRY_COUNT - 1:
-            logger.warning('Failed to write EC2 tags (attempt #%s)', i)
+            logger.warning('Failed to write EC2 tags for instance %s for build %s (attempt #%s)',
+                           launched.id, build_uuid, i)
             yield From(trollius.sleep(_TAG_RETRY_SLEEP))
             continue
 
@@ -199,6 +204,7 @@ class EC2Executor(BuilderExecutor):
 
         logger.exception('Failed to write EC2 tags (attempt #%s)', i)
 
+    logger.debug('Machine with ID %s started for build %s', launched.id, build_uuid)
     raise Return(launched.id)
 
   @coroutine

test/test_buildman.py

@@ -8,7 +8,7 @@ from trollius import coroutine, get_event_loop, From, Future, Return
 from mock import Mock
 from threading import Event
 
-from buildman.manager.executor import BuilderExecutor
+from buildman.manager.executor import BuilderExecutor, ExecutorException
 from buildman.manager.ephemeral import EphemeralBuilderManager, EXECUTORS
 
 
@@ -34,6 +34,13 @@ class TestExecutor(BuilderExecutor):
     raise Return(str(uuid.uuid4))
 
 
+
+class BadExecutor(BuilderExecutor):
+  @coroutine
+  def start_builder(self, realm, token, build_uuid):
+    raise ExecutorException('raised on purpose!')
+
+
 class TestEphemeral(unittest.TestCase):
   def __init__(self, *args, **kwargs):
     self.etcd_client_mock = None
@@ -264,6 +271,46 @@ class TestEphemeral(unittest.TestCase):
     self.manager.registered_executors[0].job_started = None
     self.manager.registered_executors[1].job_started = None
 
+
+  @async_test
+  def test_schedule_job_single_executor(self):
+    EXECUTORS['test'] = TestExecutor
+
+    self.manager.initialize({
+      'EXECUTOR': 'test',
+      'EXECUTOR_CONFIG': {},
+    })
+
+    build_job = self._create_build_job(namespace='something', retries=3)
+    result = yield From(self.manager.schedule(build_job))
+    self.assertTrue(result[0])
+
+    self.assertIsNotNone(self.manager.registered_executors[0].job_started)
+    self.manager.registered_executors[0].job_started = None
+
+
+    build_job = self._create_build_job(namespace='something', retries=0)
+    result = yield From(self.manager.schedule(build_job))
+    self.assertTrue(result[0])
+
+    self.assertIsNotNone(self.manager.registered_executors[0].job_started)
+    self.manager.registered_executors[0].job_started = None
+
+
+  @async_test
+  def test_executor_exception(self):
+    EXECUTORS['bad'] = BadExecutor
+
+    self.manager.initialize({
+      'EXECUTOR': 'bad',
+      'EXECUTOR_CONFIG': {},
+    })
+
+    build_job = self._create_build_job(namespace='something', retries=3)
+    result = yield From(self.manager.schedule(build_job))
+    self.assertFalse(result[0])
+
+
 if __name__ == '__main__':
   unittest.main()