I noticed that `watchNodeUpdates()` almost immediately after
`registerAndHeartbeat()` calls `retryRegisterNode()`, well after 5
seconds.
This call is unnecessary and made debugging a bit harder. So here, we
ensure that we only re-register node for new node events, not for
initial registration.
Here we retain 0.8.7 behavior of waiting for driver fingerprints before
registering a node, with some timeout. This is needed for system jobs,
as system job scheduling for node occur at node registration, and the
race might mean that a system job may not get placed on the node because
of missing drivers.
The timeout isn't strictly necessary, but raising it to 1 minute as it's
closer to indefinitely blocked than 1 second. We need to keep the value
high enough to capture as much drivers/devices, but low enough that
doesn't risk blocking too long due to misbehaving plugin.
Fixes https://github.com/hashicorp/nomad/issues/5579
Revert "fingerprint Constraints and Affinities have Equals, as set"
This reverts commit 596f16fb5f.
Revert "client tests assert the independent handling of interface and speed"
This reverts commit 7857ac5993.
Revert "structs missed applying a style change from the review"
This reverts commit 658916e327.
Revert "client, structs comments"
This reverts commit be2838d6ba.
Revert "client fingerprint updateNetworks preserves the network configuration"
This reverts commit fc309cb430.
Revert "client_test cleanup comments from review"
This reverts commit bc0bf4efb9.
Revert "client Networks Equals is set equality"
This reverts commit f8d432345b.
Revert "struct cleanup indentation in RequestedDevice Equals"
This reverts commit f4746411ca.
Revert "struct Equals checks for identity before value checking"
This reverts commit 0767a4665e.
Revert "fix client-test, avoid hardwired platform dependecy on lo0"
This reverts commit e89dbb2ab1.
Revert "refactor error in client fingerprint to include the offending data"
This reverts commit a7fed726c6.
Revert "add client updateNodeResources to merge but preserve manual config"
This reverts commit 84bd433c7e.
Revert "refactor struts.RequestedDevice to have its own Equals"
This reverts commit 6897825240.
Revert "refactor structs.Resource.Networks to have its own Equals"
This reverts commit 49e2e6c77b.
Revert "refactor structs.Resource.Devices to have its own Equals"
This reverts commit 4ede9226bb.
Revert "add COMPAT(0.10): Remove in 0.10 notes to impl for structs.Resources"
This reverts commit 49fbaace52.
Revert "add structs.Resources Equals"
This reverts commit 8528a2a2a6.
Revert "test that fingerprint resources are updated, net not clobbered"
This reverts commit 8ee02ddd23.
This adds a `nomad alloc restart` command and api that allows a job operator
with the alloc-lifecycle acl to perform an in-place restart of a Nomad
allocation, or a given subtask.
The driver manager is modeled after the device manager and is started by the client.
It's responsible for handling driver lifecycle and reattachment state, as well as
processing the incomming fingerprint and task events from each driver. The mananger
exposes a method for registering event handlers for task events that is used by the
task runner to update the server when a task has been updated with an event.
Since driver fingerprinting has been implemented by the driver manager, it is no
longer needed in the fingerprint mananger and has been removed.
Currently, there is a race condition between creating a taskrunner, and
updating node attributes via fingerprinting.
This is because the taskenv builder will try to iterate over the
clientconfig.Node.Attributes map, which can be concurrently updated by
the fingerprinting process, thus causing a panic.
This fixes that by providing a copy of the clientconfg to the
allocrunner inside the Read lock during config creation.
The allocLock is used to synchronize access to the alloc runner map, not
to ensure internal consistency of the alloc runners themselves. This
updates the updateAlloc process to avoid hanging on to an exclusive lock
of the map while applying changes to allocrunners themselves, as they
should be internally consistent.
This fixes a bug where any client allocation api will block during the
shutdown or updating of an allocrunner and its child taskrunners.
Fixes a bug where a driver health and attributes are never updated from
their initial status. If a driver started unhealthy, it may never go
into a healthy status.
When starting an allocation that is preempting other allocs, we create a
new group allocation watcher, and then wait for the allocations to
terminate in the allocation PreRun hooks.
If there's no preempted allocations, then we simply provide a
NoopAllocWatcher.
IOPS have been modelled as a resource since Nomad 0.1 but has never
actually been detected and there is no plan in the short term to add
detection. This is because IOPS is a bit simplistic of a unit to define
the performance requirements from the underlying storage system. In its
current state it adds unnecessary confusion and can be removed without
impacting any users. This PR leaves IOPS defined at the jobspec parsing
level and in the api/ resources since these are the two public uses of
the field. These should be considered deprecated and only exist to allow
users to stop using them during the Nomad 0.9.x release. In the future,
there should be no expectation that the field will exist.
This removes a cyclical dependency when importing client/structs from
dependencies of the plugin_loader, specifically, drivers. Due to
client/config also depending on the plugin_loader.
It also better reflects the ownership of fingerprint structs, as they
are fairly internal to the fingerprint manager.
This PR introduces a device hook that retrieves the device mount
information for an allocation. It also updates the computed node class
computation to take into account devices.
TODO Fix the task runner unit test. The environment variable is being
lost even though it is being properly set in the prestart hook.
The group utility struct does not support asynchronously launched
goroutines (goroutines-inside-of-goroutines), so switch those uses to a
normal go call.
This means watchNodeUpdates and watchNodeEvents may not be shutdown when
Shutdown() exits. During nomad agent shutdown this does not matter.
During tests this means a test may leak those goroutines or be unable to
know when those goroutines have exited.
Since there's no runtime impact and these goroutines do not affect alloc
state syncing it seems ok to risk leaking them.
This change makes few compromises:
* Looks up the devices associated with tasks at look up time. Given
that `nomad alloc status` is called rarely generally (compared to stats
telemetry and general job reporting), it seems fine. However, the
lookup overhead grows bounded by number of `tasks x total-host-devices`,
which can be significant.
* `client.Client` performs the task devices->statistics lookup. It
passes self to alloc/task runners so they can look up the device statistics
allocated to them.
* Currently alloc/task runners are responsible for constructing the
entire RPC response for stats
* The alternatives for making task runners device statistics aware
don't seem appealing (e.g. having task runners contain reference to hostStats)
* On the alloc aggregation resource usage, I did a naive merging of task device statistics.
* Personally, I question the value of such aggregation, compared to
costs of struct duplication and bloating the response - but opted to be
consistent in the API.
* With naive concatination, device instances from a single device group used by separate tasks in the alloc, would be aggregated in two separate device group statistics.
Introduce a device manager that manages the lifecycle of device plugins
on the client. It fingerprints, collects stats, and forwards Reserve
requests to the correct plugin. The manager, also handles device plugins
failing and validates their output.
