Improve job describe and get output

For get, condense completions and success into a single column, and
print the job duration. Use a new variant of ShortHumanDuration that
shows more significant digits, since duration matters more for jobs.

```
NAME                                   COMPLETIONS   DURATION   AGE
image-mirror-origin-v3.10-1529985600   1/1           47s        42m
image-mirror-origin-v3.11-1529985600   1/1           74s        42m
image-pruner-1529971200                1/1           60m        4h
```

The completions column can be:

```
COMPLETIONS
0/1        # completions nil or 1, succeeded 0
1/1        # completions nil or 1, succeeded 1
0/3        # completions 3, succeeded 1
1/3        # completions 3, succeeded 1
0/1 of 30  # parallelism of 30, completions is nil
```

Update describe to show the completion time and the duration.

pkg/printers/internalversion/describe.go

@@ -44,6 +44,7 @@ import (
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/duration"
 	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/client-go/dynamic"
@@ -1855,6 +1856,12 @@ func describeJob(job *batch.Job, events *api.EventList) (string, error) {
 		if job.Status.StartTime != nil {
 			w.Write(LEVEL_0, "Start Time:\t%s\n", job.Status.StartTime.Time.Format(time.RFC1123Z))
 		}
+		if job.Status.CompletionTime != nil {
+			w.Write(LEVEL_0, "Completed At:\t%s\n", job.Status.CompletionTime.Time.Format(time.RFC1123Z))
+		}
+		if job.Status.StartTime != nil && job.Status.CompletionTime != nil {
+			w.Write(LEVEL_0, "Duration:\t%s\n", duration.HumanDuration(job.Status.CompletionTime.Sub(job.Status.StartTime.Time)))
+		}
 		if job.Spec.ActiveDeadlineSeconds != nil {
 			w.Write(LEVEL_0, "Active Deadline Seconds:\t%ds\n", *job.Spec.ActiveDeadlineSeconds)
 		}

pkg/printers/internalversion/printers.go

@@ -149,8 +149,8 @@ func AddHandlers(h printers.PrintHandler) {
 
 	jobColumnDefinitions := []metav1beta1.TableColumnDefinition{
 		{Name: "Name", Type: "string", Format: "name", Description: metav1.ObjectMeta{}.SwaggerDoc()["name"]},
-		{Name: "Desired", Type: "integer", Description: batchv1.JobSpec{}.SwaggerDoc()["completions"]},
-		{Name: "Successful", Type: "integer", Description: batchv1.JobStatus{}.SwaggerDoc()["succeeded"]},
+		{Name: "Completions", Type: "string", Description: batchv1.JobStatus{}.SwaggerDoc()["succeeded"]},
+		{Name: "Duration", Type: "string", Description: "Time required to complete the job."},
 		{Name: "Age", Type: "string", Description: metav1.ObjectMeta{}.SwaggerDoc()["creationTimestamp"]},
 		{Name: "Containers", Type: "string", Priority: 1, Description: "Names of each container in the template."},
 		{Name: "Images", Type: "string", Priority: 1, Description: "Images referenced by each container in the template."},
@@ -750,12 +750,28 @@ func printJob(obj *batch.Job, options printers.PrintOptions) ([]metav1beta1.Tabl
 
 	var completions string
 	if obj.Spec.Completions != nil {
-		completions = strconv.Itoa(int(*obj.Spec.Completions))
+		completions = fmt.Sprintf("%d/%d", obj.Status.Succeeded, *obj.Spec.Completions)
 	} else {
-		completions = "<none>"
+		parallelism := int32(0)
+		if obj.Spec.Parallelism != nil {
+			parallelism = *obj.Spec.Parallelism
+		}
+		if parallelism > 1 {
+			completions = fmt.Sprintf("%d/1 of %d", obj.Status.Succeeded, parallelism)
+		} else {
+			completions = fmt.Sprintf("%d/1", obj.Status.Succeeded)
+		}
+	}
+	var jobDuration string
+	switch {
+	case obj.Status.StartTime == nil:
+	case obj.Status.CompletionTime == nil:
+		jobDuration = duration.HumanDuration(time.Now().Sub(obj.Status.StartTime.Time))
+	default:
+		jobDuration = duration.HumanDuration(obj.Status.CompletionTime.Sub(obj.Status.StartTime.Time))
 	}
 
-	row.Cells = append(row.Cells, obj.Name, completions, int64(obj.Status.Succeeded), translateTimestamp(obj.CreationTimestamp))
+	row.Cells = append(row.Cells, obj.Name, completions, jobDuration, translateTimestamp(obj.CreationTimestamp))
 	if options.Wide {
 		names, images := layoutContainerCells(obj.Spec.Template.Spec.Containers)
 		row.Cells = append(row.Cells, names, images, metav1.FormatLabelSelector(obj.Spec.Selector))

pkg/printers/internalversion/printers_test.go

@@ -2054,6 +2054,7 @@ func TestPrintDaemonSet(t *testing.T) {
 }
 
 func TestPrintJob(t *testing.T) {
+	now := time.Now()
 	completions := int32(2)
 	tests := []struct {
 		job    batch.Job
@@ -2072,7 +2073,7 @@ func TestPrintJob(t *testing.T) {
 					Succeeded: 1,
 				},
 			},
-			"job1\t2\t1\t0s\n",
+			"job1\t1/2\t\t0s\n",
 		},
 		{
 			batch.Job{
@@ -2087,7 +2088,40 @@ func TestPrintJob(t *testing.T) {
 					Succeeded: 0,
 				},
 			},
-			"job2\t<none>\t0\t10y\n",
+			"job2\t0/1\t\t10y\n",
+		},
+		{
+			batch.Job{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "job3",
+					CreationTimestamp: metav1.Time{Time: time.Now().AddDate(-10, 0, 0)},
+				},
+				Spec: batch.JobSpec{
+					Completions: nil,
+				},
+				Status: batch.JobStatus{
+					Succeeded:      0,
+					StartTime:      &metav1.Time{Time: now.Add(time.Minute)},
+					CompletionTime: &metav1.Time{Time: now.Add(31 * time.Minute)},
+				},
+			},
+			"job3\t0/1\t30m\t10y\n",
+		},
+		{
+			batch.Job{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "job4",
+					CreationTimestamp: metav1.Time{Time: time.Now().AddDate(-10, 0, 0)},
+				},
+				Spec: batch.JobSpec{
+					Completions: nil,
+				},
+				Status: batch.JobStatus{
+					Succeeded: 0,
+					StartTime: &metav1.Time{Time: time.Now().Add(-20 * time.Minute)},
+				},
+			},
+			"job4\t0/1\t20m\t10y\n",
 		},
 	}
 

staging/src/k8s.io/apimachinery/pkg/util/duration/BUILD

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -21,3 +21,9 @@ filegroup(
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["duration_test.go"],
+    embed = [":go_default_library"],
+)

staging/src/k8s.io/apimachinery/pkg/util/duration/duration.go

@@ -41,3 +41,37 @@ func ShortHumanDuration(d time.Duration) string {
 	}
 	return fmt.Sprintf("%dy", int(d.Hours()/24/365))
 }
+
+// HumanDuration returns a succint representation of the provided duration
+// with limited precision for consumption by humans. It provides ~2-3 significant
+// figures of duration.
+func HumanDuration(d time.Duration) string {
+	// Allow deviation no more than 2 seconds(excluded) to tolerate machine time
+	// inconsistence, it can be considered as almost now.
+	if seconds := int(d.Seconds()); seconds < -1 {
+		return fmt.Sprintf("<invalid>")
+	} else if seconds < 0 {
+		return fmt.Sprintf("0s")
+	} else if seconds < 60*2 {
+		return fmt.Sprintf("%ds", seconds)
+	}
+	minutes := int(d / time.Minute)
+	if minutes < 10 {
+		return fmt.Sprintf("%dm%ds", minutes, int(d/time.Second)%60)
+	} else if minutes < 60*3 {
+		return fmt.Sprintf("%dm", minutes)
+	}
+	hours := int(d / time.Hour)
+	if hours < 8 {
+		return fmt.Sprintf("%dh%dm", hours, int(d/time.Minute)%60)
+	} else if hours < 48 {
+		return fmt.Sprintf("%dh", hours)
+	} else if hours < 24*8 {
+		return fmt.Sprintf("%dd%dh", hours/24, hours%24)
+	} else if hours < 24*365*2 {
+		return fmt.Sprintf("%dd", hours/24)
+	} else if hours < 24*365*8 {
+		return fmt.Sprintf("%dy%dd", hours/24/365, (hours/24)%365)
+	}
+	return fmt.Sprintf("%dy", int(hours/24/365))
+}

staging/src/k8s.io/apimachinery/pkg/util/duration/duration_test.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package duration
+
+import (
+	"testing"
+	"time"
+)
+
+func TestHumanDuration(t *testing.T) {
+	tests := []struct {
+		d    time.Duration
+		want string
+	}{
+		{d: time.Second, want: "1s"},
+		{d: 70 * time.Second, want: "70s"},
+		{d: 190 * time.Second, want: "3m10s"},
+		{d: 70 * time.Minute, want: "70m"},
+		{d: 47 * time.Hour, want: "47h"},
+		{d: 49 * time.Hour, want: "2d1h"},
+		{d: (8*24 + 2) * time.Hour, want: "8d"},
+		{d: (367 * 24) * time.Hour, want: "367d"},
+		{d: (365*2*24 + 25) * time.Hour, want: "2y1d"},
+		{d: (365*8*24 + 2) * time.Hour, want: "8y"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.d.String(), func(t *testing.T) {
+			if got := HumanDuration(tt.d); got != tt.want {
+				t.Errorf("HumanDuration() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}