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From "Alex Clemmer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MESOS-6803) Agent authentication does not have an initial `delay`
Date Thu, 15 Dec 2016 19:13:58 GMT
Alex Clemmer created MESOS-6803:
-----------------------------------

             Summary: Agent authentication does not have an initial `delay`
                 Key: MESOS-6803
                 URL: https://issues.apache.org/jira/browse/MESOS-6803
             Project: Mesos
          Issue Type: Bug
          Components: agent
            Reporter: Alex Clemmer
            Assignee: Alex Clemmer


When an agent registers, there is currently a somewhat subtle difference in behavior between
the cases when it does and does not authenticate:

* In the case that it DOES NOT authenticate, we will choose a random time between 0 and the
agent `registration_backoff_factor` to initiate registration. The reason for this is to avoid
every agent hitting the master at once during master failover. (We also employ backoff to
help this.) See: [1]
* In the case that it DOES authenticate, we always attempt to authenticate and register the
Agent immediately. So currently in authenticated clusters, after failover, all agents will
immediately try to register with a master upon failover; though, this is helped somewhat by
the fact that the authenticated codepath still uses backoff. See: [2]

It is important to resolve this disparity, not only to make the system more resilient, but
also because it directly blocks us from passing many tests on platforms where authentication
is not supported at all (Windows in particular).

For some time, we have meant to make both the authenticated and unauthenticated codepaths
use a random `delay` to begin. See Adam's TODO in [3]. Historically, people seem to have had
a few problems with this:

1. Deep in the bowels of git history, Vinod notes[4] that the Agent might end up trying to
authenticate twice, if a new master is detected before the auth is processed. It seems to
me that this should not be an issue (or at least, not any more).
2. Many of our tests depend on authenticated registration happening even if `Clock::pause()`
has been called; that is, because our first attempt at authentication and Agent registration
are dispatched for immediate execution, even when we pause the clock, these events should
still happen. If we use a `delay`, then they are scheduled to happen in the future, and any
tests employing `Clock::pause` during this time will fail.

The resolution of this bug, at minimum, involves fixing the semantics of the above tests to
pass when `HAS_AUTHENTICATION` is set to false. Following this, it is realistic to expect
that we add `delay` to the authentication codepath as well.

In terms of resolution, it is useful to know the specific tests that will fail if `HAS_AUTHENTICATION`
is set to false:

```
[  FAILED  ] ExamplesTest.V1JavaFramework
[  FAILED  ] ExamplesTest.PythonFramework
[  FAILED  ] FaultToleranceTest.FrameworkReregister
[  FAILED  ] MasterAllocatorTest/0.RebalancedForUpdatedWeights, where TypeParam = mesos::internal::master::allocator::MesosAllocator<mesos::internal::master::allocator::HierarchicalAllocatorProcess<mesos::internal::master::allocator::DRFSorter,
mesos::internal::master::allocator::DRFSorter, mesos::internal::master::allocator::DRFSorter>
>
[  FAILED  ] MasterAllocatorTest/1.RebalancedForUpdatedWeights, where TypeParam = mesos::internal::tests::Module<mesos::allocator::Allocator,
(mesos::internal::tests::ModuleID)6>
[  FAILED  ] MasterTest.EndpointsForHalfRemovedSlave
[  FAILED  ] MasterTest.UnreachableTaskAfterFailover
[  FAILED  ] MasterTest.CancelRecoveredSlaveRemoval
[  FAILED  ] MasterTest.RecoveredFramework
[  FAILED  ] OversubscriptionTest.RescindRevocableOfferWithIncreasedRevocable
[  FAILED  ] OversubscriptionTest.RescindRevocableOfferWithDecreasedRevocable
[  FAILED  ] OversubscriptionTest.Reregistration
[  FAILED  ] PartitionTest.ReregisterSlavePartitionAware
[  FAILED  ] PartitionTest.ReregisterSlaveNotPartitionAware
[  FAILED  ] PartitionTest.PartitionedSlaveReregistrationMasterFailover
[  FAILED  ] PartitionTest.PartitionedSlaveOrphanedTask
[  FAILED  ] PartitionTest.SpuriousSlaveReregistration
[  FAILED  ] PartitionTest.PartitionedSlaveStatusUpdates
[  FAILED  ] PartitionTest.RegistryGcByCount
[  FAILED  ] PartitionTest.RegistryGcByAge
[  FAILED  ] PartitionTest.RegistryGcRace
[  FAILED  ] OneWayPartitionTest.MasterToSlave
[  FAILED  ] ReconciliationTest.ReconcileStatusUpdateTaskState
[  FAILED  ] ReservationTest.ACLMultipleOperations
[  FAILED  ] ReservationTest.WithoutAuthenticationWithoutPrincipal
[  FAILED  ] ReservationTest.WithoutAuthenticationWithPrincipal
[  FAILED  ] SlaveTest.DuplicateTerminalUpdateBeforeAck
[  FAILED  ] SlaveTest.StateEndpoint
[  FAILED  ] SlaveTest.PingTimeoutNoPings
[  FAILED  ] SlaveTest.PingTimeoutSomePings
[  FAILED  ] SlaveTest.ReregisterWithStatusUpdateTaskState
[  FAILED  ] SlaveTest.MaxCompletedExecutorsPerFrameworkFlag
[  FAILED  ] ContentType/AgentAPITest.NestedContainerLaunchFalse/0, where GetParam() = application/x-protobuf
[  FAILED  ] ContentType/AgentAPITest.NestedContainerLaunchFalse/1, where GetParam() = application/json
[  FAILED  ] ContentType/AgentAPITest.NestedContainerLaunch/0, where GetParam() = application/x-protobuf
[  FAILED  ] ContentType/AgentAPITest.NestedContainerLaunch/1, where GetParam() = application/json
[  FAILED  ] ContentType/AgentAPITest.LaunchNestedContainerSessionAttachFailure/0, where GetParam()
= application/x-protobuf
[  FAILED  ] ContentType/AgentAPITest.LaunchNestedContainerSessionAttachFailure/1, where GetParam()
= application/json
[  FAILED  ] DiskResource/PersistentVolumeTest.MasterFailover/0, where GetParam() = 0
[  FAILED  ] DiskResource/PersistentVolumeTest.AccessPersistentVolume/0, where GetParam()
= 0
[  FAILED  ] DiskResource/PersistentVolumeTest.AccessPersistentVolume/1, where GetParam()
= 1
[  FAILED  ] DiskResource/PersistentVolumeTest.SharedPersistentVolumeRescindOnDestroy/0, where
GetParam() = 0
[  FAILED  ] DiskResource/PersistentVolumeTest.SharedPersistentVolumeRescindOnDestroy/1, where
GetParam() = 1
[  FAILED  ] MountDiskResource/PersistentVolumeTest.AccessPersistentVolume/0, where GetParam()
= 2
[  FAILED  ] MountDiskResource/PersistentVolumeTest.SharedPersistentVolumeRescindOnDestroy/0,
where GetParam() = 2
```

[1] https://github.com/apache/mesos/blob/c5c5c13deab834e6db7e1f9d687b8cc0f6a0641f/src/slave/slave.cpp#L948
[2] https://github.com/apache/mesos/blob/c5c5c13deab834e6db7e1f9d687b8cc0f6a0641f/src/slave/slave.cpp#L942
[3] https://github.com/apache/mesos/blob/c5c5c13deab834e6db7e1f9d687b8cc0f6a0641f/src/slave/slave.cpp#L938
[4] https://github.com/apache/mesos/commit/09b1dc3e95955aa187458fcb61e1d66b04ec3af2#diff-01648193f4029dc9fc1e024949f6ea28R562



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