Mesos源码分析(11): Mesos-Master接收到launchTasks消息

根据Mesos源码分析(6): Mesos Master的初始化中的代码分析，当Mesos-Master接收到launchTask消息的时候，会调用Master::launchTasks函数。

 

1. void Master::launchTasks(
2.     const UPID& from,
3.     const FrameworkID& frameworkId,
4.     const vector<TaskInfo>& tasks,
5.     const Filters& filters,
6.     const vector<OfferID>& offerIds)
7. {
8.   Framework* framework = getFramework(frameworkId);
9.  
10.   if (framework == NULL) {
11.     LOG(WARNING)
12.       << "Ignoring launch tasks message for offers " << stringify(offerIds)
13.       << " of framework " << frameworkId
14.       << " because the framework cannot be found";
15.  
16.     return;
17.   }
18.  
19.   if (framework->pid != from) {
20.     LOG(WARNING)
21.       << "Ignoring launch tasks message for offers " << stringify(offerIds)
22.       << " from '" << from << "' because it is not from the"
23.       << " registered framework " << *framework;
24.  
25.     return;
26.   }
27.  
28.   // Currently when no tasks are specified in the launchTasks message
29.   // it is implicitly considered a decline of the offers.
30.   if (!tasks.empty()) {
31.     scheduler::Call::Accept message;
32.     message.mutable_filters()->CopyFrom(filters);
33.  
34.     Offer::Operation* operation = message.add_operations();
35.     operation->set_type(Offer::Operation::LAUNCH);
36.  
37.     foreach (const TaskInfo& task, tasks) {
38.       operation->mutable_launch()->add_task_infos()->CopyFrom(task);
39.     }
40.  
41.     foreach (const OfferID& offerId, offerIds) {
42.       message.add_offer_ids()->CopyFrom(offerId);
43.     }
44.  
45.     accept(framework, message);
46.   } else {
47.     scheduler::Call::Decline message;
48.     message.mutable_filters()->CopyFrom(filters);
49.  
50.     foreach (const OfferID& offerId, offerIds) {
51.       message.add_offer_ids()->CopyFrom(offerId);
52.     }
53.  
54.     decline(framework, message);
55.   }
56. }

 

它会进一步调用accept函数

1. void Master::accept(
2.     Framework* framework,
3.     const scheduler::Call::Accept& accept)
4. {
5.   CHECK_NOTNULL(framework);
6.  
7.   foreach (const Offer::Operation& operation, accept.operations()) {
8.     if (operation.type() == Offer::Operation::LAUNCH) {
9.       if (operation.launch().task_infos().size() > 0) {
10.         ++metrics->messages_launch_tasks;
11.       } else {
12.         ++metrics->messages_decline_offers;
13.       }
14.     }
15.  
16.     // TODO(jieyu): Add metrics for non launch operations.
17.   }
18.  
19.   // TODO(bmahler): We currently only support using multiple offers
20.   // for a single slave.
21.   Resources offeredResources;
22.   Option<SlaveID> slaveId = None();
23.   Option<Error> error = None();
24.  
25.   if (accept.offer_ids().size() == 0) {
26.     error = Error("No offers specified");
27.   } else {
28.     // Validate the offers.
29.     error = validation::offer::validate(accept.offer_ids(), this, framework);
30.  
31.     // Compute offered resources and remove the offers. If the
32.     // validation failed, return resources to the allocator.
33.     foreach (const OfferID& offerId, accept.offer_ids()) {
34.       Offer* offer = getOffer(offerId);
35.  
36.       // Since we re-use `OfferID`s, it is possible to arrive here with either
37.       // a resource offer, or an inverse offer. We first try as a resource offer
38.       // and if that fails, then we assume it is an inverse offer. This is
39.       // correct as those are currently the only 2 ways to get an `OfferID`.
40.       if (offer != NULL) {
41.         slaveId = offer->slave_id();
42.         offeredResources += offer->resources();
43.  
44.         if (error.isSome()) {
45.           allocator->recoverResources(
46.               offer->framework_id(),
47.               offer->slave_id(),
48.               offer->resources(),
49.               None());
50.         }
51.         removeOffer(offer);
52.         continue;
53.       }
54.  
55.       // Try it as an inverse offer. If this fails then the offer is no longer
56.       // valid.
57.       InverseOffer* inverseOffer = getInverseOffer(offerId);
58.       if (inverseOffer != NULL) {
59.         mesos::master::InverseOfferStatus status;
60.         status.set_status(mesos::master::InverseOfferStatus::ACCEPT);
61.         status.mutable_framework_id()->CopyFrom(inverseOffer->framework_id());
62.         status.mutable_timestamp()->CopyFrom(protobuf::getCurrentTime());
63.  
64.         allocator->updateInverseOffer(
65.             inverseOffer->slave_id(),
66.             inverseOffer->framework_id(),
67.             UnavailableResources{
68.                 inverseOffer->resources(),
69.                 inverseOffer->unavailability()},
70.             status,
71.             accept.filters());
72.  
73.         removeInverseOffer(inverseOffer);
74.         continue;
75.       }
76.  
77.       // If the offer was neither in our offer or inverse offer sets, then this
78.       // offer is no longer valid.
79.       LOG(WARNING) << "Ignoring accept of offer " << offerId
80.                    << " since it is no longer valid";
81.     }
82.   }
83.  
84.   // If invalid, send TASK_LOST for the launch attempts.
85.   // TODO(jieyu): Consider adding a 'drop' overload for ACCEPT call to
86.   // consistently handle message dropping. It would be ideal if the
87.   // 'drop' overload can handle both resource recovery and lost task
88.   // notifications.
89.   if (error.isSome()) {
90.     LOG(WARNING) << "ACCEPT call used invalid offers '" << accept.offer_ids()
91.                  << "': " << error.get().message;
92.  
93.     foreach (const Offer::Operation& operation, accept.operations()) {
94.       if (operation.type() != Offer::Operation::LAUNCH) {
95.         continue;
96.       }
97.  
98.       foreach (const TaskInfo& task, operation.launch().task_infos()) {
99.         const StatusUpdate& update = protobuf::createStatusUpdate(
100.             framework->id(),
101.             task.slave_id(),
102.             task.task_id(),
103.             TASK_LOST,
104.             TaskStatus::SOURCE_MASTER,
105.             None(),
106.             "Task launched with invalid offers: " + error.get().message,
107.             TaskStatus::REASON_INVALID_OFFERS);
108.  
109.         metrics->tasks_lost++;
110.  
111.         metrics->incrementTasksStates(
112.             TASK_LOST,
113.             TaskStatus::SOURCE_MASTER,
114.             TaskStatus::REASON_INVALID_OFFERS);
115.  
116.         forward(update, UPID(), framework);
117.       }
118.     }
119.  
120.     return;
121.   }
122.  
123.   CHECK_SOME(slaveId);
124.   Slave* slave = slaves.registered.get(slaveId.get());
125.   CHECK_NOTNULL(slave);
126.  
127.   LOG(INFO) << "Processing ACCEPT call for offers: " << accept.offer_ids()
128.             << " on slave " << *slave << " for framework " << *framework;
129.  
130.   list<Future<bool>> futures;
131.   foreach (const Offer::Operation& operation, accept.operations()) {
132.     switch (operation.type()) {
133.       case Offer::Operation::LAUNCH: {
134.         // Authorize the tasks. A task is in 'framework->pendingTasks'
135.         // before it is authorized.
136.         foreach (const TaskInfo& task, operation.launch().task_infos()) {
137.           futures.push_back(authorizeTask(task, framework));
138.  
139.           // Add to pending tasks.
140.           //
141.           // NOTE: The task ID here hasn't been validated yet, but it
142.           // doesn't matter. If the task ID is not valid, the task won't
143.           // be launched anyway. If two tasks have the same ID, the second
144.           // one will not be put into 'framework->pendingTasks', therefore
145.           // will not be launched.
146.           if (!framework->pendingTasks.contains(task.task_id())) {
147.             framework->pendingTasks[task.task_id()] = task;
148.           }
149.         }
150.         break;
151.       }
152.  
153.       // NOTE: When handling RESERVE and UNRESERVE operations, authorization
154.       // will proceed even if no principal is specified, although currently
155.       // resources cannot be reserved or unreserved unless a principal is
156.       // provided. Any RESERVE/UNRESERVE operation with no associated principal
157.       // will be found invalid when `validate()` is called in `_accept()` below.
158.  
159.       // The RESERVE operation allows a principal to reserve resources.
160.       case Offer::Operation::RESERVE: {
161.         Option<string> principal = framework->info.has_principal()
162.           ? framework->info.principal()
163.           : Option<string>::none();
164.  
165.         futures.push_back(
166.             authorizeReserveResources(
167.                 operation.reserve(), principal));
168.  
169.         break;
170.       }
171.  
172.       // The UNRESERVE operation allows a principal to unreserve resources.
173.       case Offer::Operation::UNRESERVE: {
174.         Option<string> principal = framework->info.has_principal()
175.           ? framework->info.principal()
176.           : Option<string>::none();
177.  
178.         futures.push_back(
179.             authorizeUnreserveResources(
180.                 operation.unreserve(), principal));
181.  
182.         break;
183.       }
184.  
185.       // The CREATE operation allows the creation of a persistent volume.
186.       case Offer::Operation::CREATE: {
187.         Option<string> principal = framework->info.has_principal()
188.           ? framework->info.principal()
189.           : Option<string>::none();
190.  
191.         futures.push_back(
192.             authorizeCreateVolume(
193.                 operation.create(), principal));
194.  
195.         break;
196.       }
197.  
198.       // The DESTROY operation allows the destruction of a persistent volume.
199.       case Offer::Operation::DESTROY: {
200.         Option<string> principal = framework->info.has_principal()
201.           ? framework->info.principal()
202.           : Option<string>::none();
203.  
204.         futures.push_back(
205.             authorizeDestroyVolume(
206.                 operation.destroy(), principal));
207.  
208.         break;
209.       }
210.     }
211.   }
212.  
213.   // Wait for all the tasks to be authorized.
214.   await(futures)
215.     .onAny(defer(self(),
216.                  &Master::_accept,
217.                  framework->id(),
218.                  slaveId.get(),
219.                  offeredResources,
220.                  accept,
221.                  lambda::_1));
222. }

 

如果鉴权通过，则调用Master::_accept

1. void Master::_accept(
2.     const FrameworkID& frameworkId,
3.     const SlaveID& slaveId,
4.     const Resources& offeredResources,
5.     const scheduler::Call::Accept& accept,
6.     const Future<list<Future<bool>>>& _authorizations)
7. {
8.   Framework* framework = getFramework(frameworkId);
9. ……
10.  
11.   Slave* slave = slaves.registered.get(slaveId);
12.  
13.   if (slave == NULL || !slave->connected) {
14.     foreach (const Offer::Operation& operation, accept.operations()) {
15.       if (operation.type() != Offer::Operation::LAUNCH) {
16.         continue;
17.       }
18.  
19.       foreach (const TaskInfo& task, operation.launch().task_infos()) {
20.         const TaskStatus::Reason reason =
21.             slave == NULL ? TaskStatus::REASON_SLAVE_REMOVED
22.                           : TaskStatus::REASON_SLAVE_DISCONNECTED;
23.         const StatusUpdate& update = protobuf::createStatusUpdate(
24.             framework->id(),
25.             task.slave_id(),
26.             task.task_id(),
27.             TASK_LOST,
28.             TaskStatus::SOURCE_MASTER,
29.             None(),
30.             slave == NULL ? "Slave removed" : "Slave disconnected",
31.             reason);
32.  
33.         metrics->tasks_lost++;
34.  
35.         metrics->incrementTasksStates(
36.             TASK_LOST,
37.             TaskStatus::SOURCE_MASTER,
38.             reason);
39.  
40.         forward(update, UPID(), framework);
41.       }
42.     }
43.  
44.     // Tell the allocator about the recovered resources.
45.     allocator->recoverResources(
46.         frameworkId,
47.         slaveId,
48.         offeredResources,
49.         None());
50.  
51.     return;
52.   }
53.  
54.   // Some offer operations update the offered resources. We keep
55.   // updated offered resources here. When a task is successfully
56.   // launched, we remove its resource from offered resources.
57.   Resources _offeredResources = offeredResources;
58.  
59.   // The order of `authorizations` must match the order of the operations in
60.   // `accept.operations()`, as they are iterated through simultaneously.
61.   CHECK_READY(_authorizations);
62.   list<Future<bool>> authorizations = _authorizations.get();
63.  
64.   foreach (const Offer::Operation& operation, accept.operations()) {
65.     switch (operation.type()) {
66.       // The RESERVE operation allows a principal to reserve resources.
67.       case Offer::Operation::RESERVE: {
68.         Future<bool> authorization = authorizations.front();
69.         authorizations.pop_front();
70.  
71.         CHECK(!authorization.isDiscarded());
72.  
73.         if (authorization.isFailed()) {
74.           // TODO(greggomann): We may want to retry this failed authorization
75.           // request rather than dropping it immediately.
76.           drop(framework,
77.                operation,
78.                "Authorization of principal '" + framework->info.principal() +
79.                "' to reserve resources failed: " +
80.                authorization.failure());
81.  
82.           continue;
83.         } else
    if (!authorization.get()) {
84.           drop(framework,
85.                operation,
86.                "Not authorized to reserve resources as '" +
87.                  framework->info.principal() + "'");
88.  
89.           continue;
90.         }
91.  
92.         Option<string> principal = framework->info.has_principal()
93.           ? framework->info.principal()
94.           : Option<string>::none();
95.  
96.         // Make sure this reserve operation is valid.
97.         Option<Error> error = validation::operation::validate(
98.             operation.reserve(), principal);
99.  
100.         if (error.isSome()) {
101.           drop(framework, operation, error.get().message);
102.           continue;
103.         }
104.  
105.         // Test the given operation on the included resources.
106.         Try<Resources> resources = _offeredResources.apply(operation);
107.         if (resources.isError()) {
108.           drop(framework, operation, resources.error());
109.           continue;
110.         }
111.  
112.         _offeredResources = resources.get();
113.  
114.         LOG(INFO) << "Applying RESERVE operation for resources "
115.                   << operation.reserve().resources() << " from framework "
116.                   << *framework << " to slave " << *slave;
117.  
118.         apply(framework, slave, operation);
119.         break;
120.       }
121.  
122.       // The UNRESERVE operation allows a principal to unreserve resources.
123.       case Offer::Operation::UNRESERVE: {
124.         Future<bool> authorization = authorizations.front();
125.         authorizations.pop_front();
126.  
127.         CHECK(!authorization.isDiscarded());
128.  
129.         if (authorization.isFailed()) {
130.           // TODO(greggomann): We may want to retry this failed authorization
131.           // request rather than dropping it immediately.
132.           drop(framework,
133.                operation,
134.                "Authorization of principal '" + framework->info.principal() +
135.                "' to unreserve resources failed: " +
136.                authorization.failure());
137.  
138.           continue;
139.         } else
     if (!authorization.get()) {
140.           drop(framework,
141.                operation,
142.                "Not authorized to unreserve resources as '" +
143.                  framework->info.principal() + "'");
144.  
145.           continue;
146.         }
147.  
148.         // Make sure this unreserve operation is valid.
149.         Option<Error> error = validation::operation::validate(
150.             operation.unreserve());
151.  
152.         if (error.isSome()) {
153.           drop(framework, operation, error.get().message);
154.           continue;
155.         }
156.  
157.         // Test the given operation on the included resources.
158.         Try<Resources> resources = _offeredResources.apply(operation);
159.         if (resources.isError()) {
160.           drop(framework, operation, resources.error());
161.           continue;
162.         }
163.  
164.         _offeredResources = resources.get();
165.  
166.         LOG(INFO) << "Applying UNRESERVE operation for resources "
167.                   << operation.unreserve().resources() << " from framework "
168.                   << *framework << " to slave " << *slave;
169.  
170.         apply(framework, slave, operation);
171.         break;
172.       }
173.  
174.       case Offer::Operation::CREATE: {
175.         Future<bool> authorization = authorizations.front();
176.         authorizations.pop_front();
177.  
178.         CHECK(!authorization.isDiscarded());
179.  
180.         if (authorization.isFailed()) {
181.           // TODO(greggomann): We may want to retry this failed authorization
182.           // request rather than dropping it immediately.
183.           drop(framework,
184.                operation,
185.                "Authorization of principal '" + framework->info.principal() +
186.                "' to create persistent volumes failed: " +
187.                authorization.failure());
188.  
189.           continue;
190.         } else
     if (!authorization.get()) {
191.           drop(framework,
192.                operation,
193.                "Not authorized to create persistent volumes as '" +
194.                  framework->info.principal() + "'");
195.  
196.           continue;
197.         }
198.  
199.         // Make sure this create operation is valid.
200.         Option<Error> error = validation::operation::validate(
201.             operation.create(), slave->checkpointedResources);
202.  
203.         if (error.isSome()) {
204.           drop(framework, operation, error.get().message);
205.           continue;
206.         }
207.  
208.         Try<Resources> resources = _offeredResources.apply(operation);
209.         if (resources.isError()) {
210.           drop(framework, operation, resources.error());
211.           continue;
212.         }
213.  
214.         _offeredResources = resources.get();
215.  
216.         LOG(INFO) << "Applying CREATE operation for volumes "
217.                   << operation.create().volumes() << " from framework "
218.                   << *framework << " to slave " << *slave;
219.  
220.         apply(framework, slave, operation);
221.         break;
222.       }
223.  
224.       case Offer::Operation::DESTROY: {
225.         Future<bool> authorization = authorizations.front();
226.         authorizations.pop_front();
227.  
228.         CHECK(!authorization.isDiscarded());
229.  
230.         if (authorization.isFailed()) {
231.           // TODO(greggomann): We may want to retry this failed authorization
232.           // request rather than dropping it immediately.
233.           drop(framework,
234.                operation,
235.                "Authorization of principal '" + framework->info.principal() +
236.                "' to destroy persistent volumes failed: " +
237.                authorization.failure());
238.  
239.           continue;
240.         } else
     if (!authorization.get()) {
241.           drop(framework,
242.                operation,
243.                "Not authorized to destroy persistent volumes as '" +
244.                  framework->info.principal() + "'");
245.  
246.           continue;
247.         }
248.  
249.         // Make sure this destroy operation is valid.
250.         Option<Error> error = validation::operation::validate(
251.             operation.destroy(), slave->checkpointedResources);
252.  
253.         if (error.isSome()) {
254.           drop(framework, operation, error.get().message);
255.           continue;
256.         }
257.  
258.         Try<Resources> resources = _offeredResources.apply(operation);
259.         if (resources.isError()) {
260.           drop(framework, operation, resources.error());
261.           continue;
262.         }
263.  
264.         _offeredResources = resources.get();
265.  
266.         LOG(INFO) << "Applying DESTROY operation for volumes "
267.                   << operation.create().volumes() << " from framework "
268.                   << *framework << " to slave " << *slave;
269.  
270.         apply(framework, slave, operation);
271.         break;
272.       }
273.  
274.       case Offer::Operation::LAUNCH: {
275.         foreach (const TaskInfo& task, operation.launch().task_infos()) {
276.           Future<bool> authorization = authorizations.front();
277.           authorizations.pop_front();
278.  
279.           // NOTE: The task will not be in 'pendingTasks' if
280.           // 'killTask()' for the task was called before we are here.
281.           // No need to launch the task if it's no longer pending.
282.           // However, we still need to check the authorization result
283.           // and do the validation so that we can send status update
284.           // in case the task has duplicated ID.
285.           bool pending = framework->pendingTasks.contains(task.task_id());
286.  
287.           // Remove from pending tasks.
288.           framework->pendingTasks.erase(task.task_id());
289.  
290.           CHECK(!authorization.isDiscarded());
291.  
292.           if (authorization.isFailed() || !authorization.get()) {
293.             string user = framework->info.user(); // Default user.
294.             if (task.has_command() && task.command().has_user()) {
295.               user = task.command().user();
296.             } else
     if (task.has_executor() &&
297.                        task.executor().command().has_user()) {
298.               user = task.executor().command().user();
299.             }
300.  
301.             const StatusUpdate& update = protobuf::createStatusUpdate(
302.                 framework->id(),
303.                 task.slave_id(),
304.                 task.task_id(),
305.                 TASK_ERROR,
306.                 TaskStatus::SOURCE_MASTER,
307.                 None(),
308.                 authorization.isFailed() ?
309.                     "Authorization failure: " + authorization.failure() :
310.                     "Not authorized to launch as user '" + user + "'",
311.                 TaskStatus::REASON_TASK_UNAUTHORIZED);
312.  
313.             metrics->tasks_error++;
314.  
315.             metrics->incrementTasksStates(
316.                 TASK_ERROR,
317.                 TaskStatus::SOURCE_MASTER,
318.                 TaskStatus::REASON_TASK_UNAUTHORIZED);
319.  
320.             forward(update, UPID(), framework);
321.  
322.             continue;
323.           }
324.  
325.           // Validate the task.
326.  
327.           // Make a copy of the original task so that we can
328.           // fill the missing `framework_id` in ExecutorInfo
329.           // if needed. This field was added to the API later
330.           // and thus was made optional.
331.           TaskInfo task_(task);
332.           if (task.has_executor() && !task.executor().has_framework_id()) {
333.             task_.mutable_executor()
334.                 ->mutable_framework_id()->CopyFrom(framework->id());
335.           }
336.  
337.           const Option<Error>& validationError = validation::task::validate(
338.               task_,
339.               framework,
340.               slave,
341.               _offeredResources);
342.  
343.           if (validationError.isSome()) {
344.             const StatusUpdate& update = protobuf::createStatusUpdate(
345.                 framework->id(),
346.                 task_.slave_id(),
347.                 task_.task_id(),
348.                 TASK_ERROR,
349.                 TaskStatus::SOURCE_MASTER,
350.                 None(),
351.                 validationError.get().message,
352.                 TaskStatus::REASON_TASK_INVALID);
353.  
354.             metrics->tasks_error++;
355.  
356.             metrics->incrementTasksStates(
357.                 TASK_ERROR,
358.                 TaskStatus::SOURCE_MASTER,
359.                 TaskStatus::REASON_TASK_INVALID);
360.  
361.             forward(update, UPID(), framework);
362.  
363.             continue;
364.           }
365.  
366.           // Add task.
367.           if (pending) {
368.             _offeredResources -= addTask(task_, framework, slave);
369.  
370.             // TODO(bmahler): Consider updating this log message to
371.             // indicate when the executor is also being launched.
372.             LOG(INFO) << "Launching task " << task_.task_id()
373.                       << " of framework " << *framework
374.                       << " with resources " << task_.resources()
375.                       << " on slave " << *slave;
376.  
377.             RunTaskMessage message;
378.             message.mutable_framework()->MergeFrom(framework->info);
379.  
380.             // TODO(anand): We set 'pid' to UPID() for http frameworks
381.             // as 'pid' was made optional in 0.24.0. In 0.25.0, we
382.             // no longer have to set pid here for http frameworks.
383.             message.set_pid(framework->pid.getOrElse(UPID()));
384.             message.mutable_task()->MergeFrom(task_);
385.  
386.             if (HookManager::hooksAvailable()) {
387.               // Set labels retrieved from label-decorator hooks.
388.               message.mutable_task()->mutable_labels()->CopyFrom(
389.                   HookManager::masterLaunchTaskLabelDecorator(
390.                       task_,
391.                       framework->info,
392.                       slave->info));
393.             }
394.  
395.             send(slave->pid, message);
396.           }
397.         }
398.         break;
399.       }
400.  
401.       default:
402.         LOG(ERROR) << "Unsupported offer operation " << operation.type();
403.         break;
404.     }
405.   }
406.  
407.   if (!_offeredResources.empty()) {
408.     // Tell the allocator about the unused (e.g., refused) resources.
409.     allocator->recoverResources(
410.         frameworkId,
411.         slaveId,
412.         _offeredResources,
413.         accept.filters());
414.   }
415. }

 

Mesos-Master将RunTaskMessage消息发送给Mesos-Slave