From 7cb7662c2eb7a03f91d0d573401baa24cfd1ab33 Mon Sep 17 00:00:00 2001 From: chadquarles315 Date: Wed, 2 Jul 2025 20:46:51 +0000 Subject: [PATCH] Add For A Fixed Completion Count Job --- For-A-Fixed-Completion-Count-Job.md | 62 +++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 For-A-Fixed-Completion-Count-Job.md diff --git a/For-A-Fixed-Completion-Count-Job.md b/For-A-Fixed-Completion-Count-Job.md new file mode 100644 index 0000000..970f107 --- /dev/null +++ b/For-A-Fixed-Completion-Count-Job.md @@ -0,0 +1,62 @@ +[reference.com](https://www.reference.com/business-finance/good-things-say-during-job-interview-8587d3d3458871fc?ad=dirN&qo=serpIndex&o=740005&origq=jobs)
Name: pi Namespace: default Selector: batch.kubernetes.io/ controller-uid=c9948307-e56d-4b5d-8302-ae2d7b7da67c Labels: batch.kubernetes.io/ controller-uid=c9948307-e56d-4b5d-8302-ae2d7b7da67c batch.kubernetes.io/ job-name=pi ... Annotations: batch.kubernetes.io/ job-tracking: "" Parallelism: 1 Completions: 1 Start Time: Mon, 02 Dec 2019 15:20:11 +0200 Completed At: Mon, 02 Dec 2019 15:21:16 +0200 Duration: 65s Pods Statuses: 0 Running/ 1 Succeeded/ 0 Failed Pod Template: Labels: batch.kubernetes.io/ controller-uid=c9948307-e56d-4b5d-8302-ae2d7b7da67c batch.kubernetes.io/ job-name=pi Containers: pi: Image: perl:5.34.0 Port: Host Port: Command: perl -Mbignum=bpi -wle print bpi( 2000) Environment: Mounts: Volumes: Events: Type Reason Age From Message-- ---------- ------- Normal SuccessfulCreate 21s job-controller Created pod: pi-xf9p4 Normal Completed 18s job-controller Job finished
[reference.com](https://www.reference.com/business-finance/jobs-people-brazil-81556ca9d3d555d9?ad=dirN&qo=paaIndex&o=740005&origq=jobs) +
apiVersion: batch/v1 kind: Job metadata: annotations: batch.kubernetes.io/ job-tracking: "" ... creationTimestamp: "2022-11-10T17:53:53 Z" generation: 1 labels: batch.kubernetes.io/ controller-uid: 863452e6-270d-420e-9b94-53a54146c223 batch.kubernetes.io/ job-name: pi name: pi namespace: default resourceVersion: "4751" uid: 204fb678-040b-497f-9266-35ffa8716d14 specification: backoffLimit: 4 completionMode: NonIndexed conclusions: 1 parallelism: 1 selector: matchLabels: batch.kubernetes.io/ controller-uid: 863452e6-270d-420e-9b94-53a54146c223 suspend: incorrect template: metadata: creationTimestamp: null labels: batch.kubernetes.io/ controller-uid: 863452e6-270d-420e-9b94-53a54146c223 batch.kubernetes.io/ job-name: pi spec: containers: - command: - perl - -Mbignum=bpi - -wle - print bpi( 2000) image: perl:5.34.0 imagePullPolicy: IfNotPresent name: pi resources: terminationMessagePath:/ dev/termination-log terminationMessagePolicy: File dnsPolicy: ClusterFirst restartPolicy: Never schedulerName: default-scheduler securityContext: terminationGracePeriodSeconds: 30 status: active: 1 ready: 0 startTime: "2022-11-10T17:53:57 Z" uncountedTerminatedPods:
+
To view completed Pods of a Task, use kubectl get pods.
+
To list all the Pods that come from a Job in a maker legible kind, you can use a command like this:
+
Here, the selector is the very same as the selector for the Job. The-- output=jsonpath option defines an expression with the name from each Pod in the returned list.
+
View the basic output of among the pods:
+
Another method to view the logs of a Job:
+
The output is comparable to this:
+
Writing a Job spec
+
Just like all other Kubernetes config, a Job requires apiVersion, kind, and metadata fields.
+
When the control aircraft creates brand-new Pods for a Task, the.metadata.name of the Job belongs to the basis for naming those Pods. The name of a Job need to be a valid DNS subdomain value, however this can produce unexpected outcomes for the Pod hostnames. For best compatibility, the name must follow the more limiting rules for a DNS label. Even when the name is a DNS subdomain, the name needs to be no longer than 63 characters.
+
A Job also needs a.spec area.
+
Job Labels
+
Job labels will have batch.kubernetes.io/ prefix for job-name and controller-uid.
+
Pod Template
+
The.spec.template is the only required field of the.spec.
+
The.spec.template is a pod template. It has exactly the exact same schema as a Pod, except it is embedded and does not have an apiVersion or kind.
+
In addition to needed fields for a Pod, a pod template in a Task need to specify appropriate labels (see pod selector) and a suitable restart policy.
+
Only a RestartPolicy equal to Never or OnFailure is permitted.
+
Pod selector
+
The.spec.selector field is optional. In nearly all cases you ought to not specify it. See area specifying your own pod selector.
+
Parallel execution for [Jobs](https://sharingopportunities.com/)
+
There are 3 main types of job suitable to run as a Job:
+
1. Non-parallel Jobs- typically, only one Pod is started, unless the Pod stops working. +
- the Job is total as soon as its Pod terminates successfully. +

+

2. Parallel Jobs with a repaired completion count:- define a non-zero positive worth for.spec.completions. +
- the Job represents the total task, and is complete when there are.spec.completions successful Pods. +
- when using.spec.completionMode="Indexed", each Pod gets a different index in the range 0 to.spec.completions-1. +

+

3. Parallel [Jobs](https://sharingopportunities.com/) with a work queue:- do not specify.spec.completions, default to.spec.parallelism. +
- the Pods should coordinate among themselves or an external service to determine what each should deal with. For instance, a Pod might fetch a batch of as much as N products from the work line. +
- each Pod is separately capable of determining whether all its peers are done, and hence that the entire Job is done. +
- when any Pod from the Job terminates with success, no new Pods are created. +
- as soon as at least one Pod has terminated with success and all Pods are terminated, then the Job is completed with success. +
- as soon as any Pod has actually exited with success, no other Pod needs to still be doing any work for this job or composing any output. They ought to all be in the procedure of leaving. +

+

+For a non-parallel Job, you can leave both.spec.completions and.spec.parallelism unset. When both are unset, both are defaulted to 1.
+
For a fixed conclusion count Job, you must set.spec.completions to the number of completions needed. You can set.spec.parallelism, or leave it unset and it will default to 1.
+
For a work line Job, you must leave.spec.completions unset, and set.spec.parallelism to a non-negative integer.
+
To find out more about how to utilize the various types of job, see the job patterns area.
+
Controlling parallelism
+
The asked for parallelism (. spec.parallelism) can be set to any non-negative value. If it is unspecified, it defaults to 1. If it is defined as 0, then the Job is successfully paused up until it is increased.
+
Actual parallelism (variety of pods running at any immediate) may be basically than requested parallelism, for a variety of reasons:
+
- For fixed conclusion count Jobs, the real number of pods running in parallel will not exceed the variety of remaining conclusions. Higher worths of.spec.parallelism are effectively disregarded. +
- For work line [Jobs](https://sharingopportunities.com/), no new Pods are begun after any Pod has succeeded-- remaining Pods are enabled to finish, nevertheless. +
- If the Job Controller has actually not had time to respond. +
- If the Job controller failed to create Pods for any reason (lack of ResourceQuota, absence of permission, and so on), then there might be less pods than requested. +
- The Job controller may throttle new Pod creation due to extreme previous pod failures in the same Job. +
- When a Pod is gracefully closed down, it takes some time to stop. +
+Completion mode
+
Jobs with fixed conclusion count - that is, jobs that have non null.spec.completions - can have a conclusion mode that is specified in.spec.completionMode:
+
NonIndexed (default): the Job is considered total when there have actually been.spec.completions successfully finished Pods. To put it simply, each Pod completion is homologous to each other. Note that Jobs that have null.spec.completions are .
+

Indexed: the Pods of a Task get an associated completion index from 0 to.spec.completions-1. The index is available through four systems:
+
- The Pod annotation batch.kubernetes.io/ job-completion-index. +
- The Pod label batch.kubernetes.io/ job-completion-index (for v1.28 and later). Note the function gate PodIndexLabel must be made it possible for to utilize this label, and it is allowed by default. +
- As part of the Pod hostname, following the pattern $(job-name)-$(index). When you use an Indexed Job in combination with a Service, Pods within the Job can use the deterministic hostnames to address each other by means of DNS. To find out more about how to configure this, see Job with Pod-to-Pod Communication. +
- From the containerized job, in the environment variable JOB_COMPLETION_INDEX. +
+The Job is considered total when there is one effectively completed Pod for each index. To find out more about how to use this mode, see Indexed Job for Parallel Processing with Static Work Assignment.
\ No newline at end of file