Automatic merge from submit-queue (batch tested with PRs 40196, 40143, 40277)
Emit warning event when CronJob cannot determine starting time
**What this PR does / why we need it**:
In #39608, we've modified the error message for when a CronJob has too many unmet starting times to enumerate to figure out the next starting time. This makes it more "actionable", and the user can now set a deadline to avoid running into this. However, the error message is still only controller level AFAIK and thus not exposed to the user. From his perspective, there is no way to tell why the CronJob is not scheduling the next instance.
The PR adds a warning event in addition to the error in the controller manager's log.
**Which issue this PR fixes**: This is an addition to PR #39608 regarding #36311.
**Special notes for your reviewer**: cc @soltysh
**Release note**:
```release-note
```
Automatic merge from submit-queue (batch tested with PRs 40232, 40235, 40237, 40240)
Fixup pet terminology in log and user-facing events
**What this PR does / why we need it**:
Removes some user-facing strings for pet terminology.
Automatic merge from submit-queue
make client-go more authoritative
Builds on https://github.com/kubernetes/kubernetes/pull/40103
This moves a few more support package to client-go for origination.
1. restclient/watch - nodep
1. util/flowcontrol - used interface
1. util/integer, util/clock - used in controllers and in support of util/flowcontrol
Automatic merge from submit-queue
controller: decouple cleanup policy from deployment strategies
Deployments get cleaned up only when they are paused, they get scaled up/down,
or when the strategy that drives rollouts completes. This means that stuck
deployments that fall into none of the above categories will not get cleaned
up. Since cleanup is already safe by itself (we only delete old replica sets
that are synced by the replica set controller and have no replicas) we can
execute it for every deployment when there is no intention to rollback.
Fixes https://github.com/kubernetes/kubernetes/issues/40068
Deployments get cleaned up only when they are paused, they get scaled up/down,
or when the strategy that drives rollouts completes. This means that stuck
deployments that fall into none of the above categories will not get cleaned
up. Since cleanup is already safe by itself (we only delete old replica sets
that are synced by the replica set controller and have no replicas) we can
execute it for every deployment when there is no intention to rollback.
Automatic merge from submit-queue (batch tested with PRs 34763, 38706, 39939, 40020)
Use Statefulset instead in e2e and controller
Quick fix ref: #35534
We should finish the issue to meet v1.6 milestone.
Automatic merge from submit-queue
genericapiserver: cut off pkg/serviceaccount dependency
**Blocked** by pkg/api/validation/genericvalidation to be split up and moved into apimachinery.
Automatic merge from submit-queue
Do not list CronJob unmet starting times beyond deadline
**What this PR does / why we need it**:
See #36311. `getRecentUnmetScheduleTimes` gives up after 100 unmet times to avoid wasting too much CPU or memory generating all the times, as it generates them sequentially.
When concurrency is forbidden, this is conceptually un-necessary: we only need the last unmet start time. This suggests that when concurrency is forbidden, we could generate times by going backward in time from now. This is not very practical as CronJob currently relies on a package that only provides `Next` and no `Prev`. Hand-cooking a `Prev` does not seem like a good idea. I could submit a PR to the cron library to add a `Prev` method, and use that when concurrency is forbidden through something like `getLastUnmetScheduleTime`. This would be `O(1)` and there would be no limit involved.
(edit: actually, even for the other concurrency settings, we only start the last unmet start times -- there is a `TODO` in the controller to actually start all of them, but that is not implemented at the moment. This means the solution would apply, at least temporarily, to all concurrency settings).
cc @soltysh what do you think?
In the meantime, I would suggest to do something simple. Currently, the user has no way to configure anything to ensure that his CronJob will not get stuck if one job takes more that 100 unmet times.
`getRecentUnmetScheduleTimes` starts with an initial time corresponding to the last start (or to the creation of the CronJob, if nothing has started yet). However, when `StartingDeadlineSeconds` is set, the controller will not start anything that is older than the deadline, so if the last start is way beyond the deadline, we are generating potentially lots of unmet start times that will not be considered by the scheduler for scheduling anyway.
Consider a job running every minute, where the last instance has taken 120 minutes. This means there are more than 100 unmet times when we start counting from the last start time.
**The PR makes `getRecentUnmetScheduleTimes` only consider times that do not fall beyond the deadline.** Here, the CronJob can be configured with a `StartingDeadlineSeconds` of, say, 10 minutes. After the 120min job has run, `getRecentUnmetScheduleTimes` will only consider the times in the last 10 minutes from now, and will not get stuck.
As a side note on the max. number of unmet times to use as limits in terms of CPU used by the controller: I have run a quick benchmark on my i7 mac. Schedules corresponding to "once a week" tend to be more expensive to generate unmet times for. Just FYI.
```
+--------------+---------------+--------------+
| SCHEDULE | MISSED STARTS | TIMING |
+--------------+---------------+--------------+
| */1 * * * ? | 100 | 383.645µs |
| */30 * * * ? | 100 | 354.765µs |
| 30 1 * * ? | 100 | 1.065124ms |
| 30 1 * * 0 | 100 | 1.80034ms |
| */1 * * * ? | 500 | 1.341365ms |
| */30 * * * ? | 500 | 1.814441ms |
| 30 1 * * ? | 500 | 8.475012ms |
| 30 1 * * 0 | 500 | 10.020613ms |
| */1 * * * ? | 1000 | 2.551697ms |
| */30 * * * ? | 1000 | 4.075813ms |
| 30 1 * * ? | 1000 | 17.674945ms |
| 30 1 * * 0 | 1000 | 19.149324ms |
| */1 * * * ? | 10000 | 25.725531ms |
| */30 * * * ? | 10000 | 87.520022ms |
| 30 1 * * ? | 10000 | 174.29216ms |
| 30 1 * * 0 | 10000 | 196.565748ms |
+--------------+---------------+--------------+
```
using
```.go
package main
import (
"fmt"
"time"
"os"
"strconv"
"github.com/robfig/cron"
"github.com/olekukonko/tablewriter"
)
func timeSchedule(schedule string, iterations int) (time.Duration) {
sched, err := cron.ParseStandard(schedule)
if err != nil {
panic(fmt.Sprintf("Unparseable schedule: %s", err))
}
start := time.Now()
t := time.Now()
for i := 1; i <= iterations; i++ {
t = sched.Next(t)
}
return time.Since(start)
}
func main() {
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Schedule", "Missed starts", "Timing"})
schedules := []string{"*/1 * * * ?", "*/30 * * * ?", "30 1 * * ?", "30 1 * * 0"}
iteration_nums := []int{100, 500, 1000, 10000}
for _, iterations := range iteration_nums {
for _, schedule := range schedules {
table.Append([]string{schedule,
strconv.Itoa(iterations),
timeSchedule(schedule, iterations).String()})
}
}
table.Render()
}
```
**Which issue this PR fixes**: fixes#36311
**Special notes for your reviewer**:
**Release note**:
```release-note
```
Automatic merge from submit-queue (batch tested with PRs 38592, 39949, 39946, 39882)
move api/errors to apimachinery
`pkg/api/errors` is a set of helpers around `meta/v1.Status` that help to create and interpret various apiserver errors. Things like `.NewNotFound` and `IsNotFound` pairings. This pull moves it into apimachinery for use by the clients and servers.
@smarterclayton @lavalamp First commit is the move plus minor fitting. Second commit is straight replace and generation.
Automatic merge from submit-queue
Updated unit tests
@janetkuo updated the flaky unit test to have the same structure with regard to uncasting as the rest of the tests. ptal
Automatic merge from submit-queue (batch tested with PRs 39807, 37505, 39844, 39525, 39109)
Update deployment equality helper
@mfojtik @janetkuo this is split out of https://github.com/kubernetes/kubernetes/pull/38714 to reduce the size of that PR, ptal
Automatic merge from submit-queue (batch tested with PRs 39807, 37505, 39844, 39525, 39109)
Made cache.Controller to be interface.
**What this PR does / why we need it**:
#37504
Automatic merge from submit-queue
replace global registry in apimachinery with global registry in k8s.io/kubernetes
We'd like to remove all globals, but our immediate problem is that a shared registry between k8s.io/kubernetes and k8s.io/client-go doesn't work. Since client-go makes a copy, we can actually keep a global registry with other globals in pkg/api for now.
@kubernetes/sig-api-machinery-misc @lavalamp @smarterclayton @sttts
