This change modifies the Nomad job register and deregister RPCs to
accept an updated option set which includes eval priority. This
param is optional and override the use of the job priority to set
the eval priority.
In order to ensure all evaluations as a result of the request use
the same eval priority, the priority is shared to the
allocReconciler and deploymentWatcher. This creates a new
distinction between eval priority and job priority.
The Nomad agent HTTP API has been modified to allow setting the
eval priority on job update and delete. To keep consistency with
the current v1 API, job update accepts this as a payload param;
job delete accepts this as a query param.
Any user supplied value is validated within the agent HTTP handler
removing the need to pass invalid requests to the server.
The register and deregister opts functions now all for setting
the eval priority on requests.
The change includes a small change to the DeregisterOpts function
which handles nil opts. This brings the function inline with the
RegisterOpts.
The reconciler has some complicated behavior when there are already running
allocations from a previous version of the job that we want to keep, as
happens during a rollback. Document this behavior with a test.
node drain: use msgtype on txn so that events are emitted
wip: encoding extension to add Node.Drain field back to API responses
new approach for hiding Node.SecretID in the API, using `json` tag
documented this approach in the contributing guide
refactored the JSON handlers with extensions
modified event stream encoding to use the go-msgpack encoders with the extensions
When an alloc is due to be rescheduleLater, it goes through the
reconciler twice: once to be ignored with a follow up evals, and once
again when processing the follow up eval where they appear as
rescheduleNow.
Here, we ignore them in the first run and mark them as stopped in second
iteration; rather than stop them twice.
Currently, when an alloc fails and is rescheduled, the alloc desired
state remains as "run" and the nomad client may not free the resources.
Here, we ensure that an alloc is marked as stopped when it's
rescheduled.
Notice the Desired Status and Description before and after this change:
Before:
```
mars-2:nomad notnoop$ nomad alloc status 02aba49e
ID = 02aba49e
Eval ID = bb9ed1d2
Name = example-reschedule.nodes[0]
Node ID = 5853d547
Node Name = mars-2.local
Job ID = example-reschedule
Job Version = 0
Client Status = failed
Client Description = Failed tasks
Desired Status = run
Desired Description = <none>
Created = 10s ago
Modified = 5s ago
Replacement Alloc ID = d6bf872b
Task "payload" is "dead"
Task Resources
CPU Memory Disk Addresses
0/100 MHz 24 MiB/300 MiB 300 MiB
Task Events:
Started At = 2019-06-06T21:12:45Z
Finished At = 2019-06-06T21:12:50Z
Total Restarts = 0
Last Restart = N/A
Recent Events:
Time Type Description
2019-06-06T17:12:50-04:00 Not Restarting Policy allows no restarts
2019-06-06T17:12:50-04:00 Terminated Exit Code: 1
2019-06-06T17:12:45-04:00 Started Task started by client
2019-06-06T17:12:45-04:00 Task Setup Building Task Directory
2019-06-06T17:12:45-04:00 Received Task received by client
```
After:
```
ID = 5001ccd1
Eval ID = 53507a02
Name = example-reschedule.nodes[0]
Node ID = a3b04364
Node Name = mars-2.local
Job ID = example-reschedule
Job Version = 0
Client Status = failed
Client Description = Failed tasks
Desired Status = stop
Desired Description = alloc was rescheduled because it failed
Created = 13s ago
Modified = 3s ago
Replacement Alloc ID = 7ba7ac20
Task "payload" is "dead"
Task Resources
CPU Memory Disk Addresses
21/100 MHz 24 MiB/300 MiB 300 MiB
Task Events:
Started At = 2019-06-06T21:22:50Z
Finished At = 2019-06-06T21:22:55Z
Total Restarts = 0
Last Restart = N/A
Recent Events:
Time Type Description
2019-06-06T17:22:55-04:00 Not Restarting Policy allows no restarts
2019-06-06T17:22:55-04:00 Terminated Exit Code: 1
2019-06-06T17:22:50-04:00 Started Task started by client
2019-06-06T17:22:50-04:00 Task Setup Building Task Directory
2019-06-06T17:22:50-04:00 Received Task received by client
```
This PR changes behavior of the scheduler such that a task group with a
deployment that is failed or paused will not cause the scheduler to skip
migrations.
The reason for this change is that it causes a bad UX when draining
nodes with allocations that are part of a failed/paused deployment.
These operations should not be coupled in any way and this remedies
that.
Prior behavior was still correct, but required either jobs to
transistion to a healthy state or for the node to hit its drain
deadline.
