pbacsko commented on code in PR #927:
URL: https://github.com/apache/yunikorn-core/pull/927#discussion_r1713998142


##########
pkg/scheduler/objects/application.go:
##########
@@ -2157,6 +2158,23 @@ func (sa *Application) GetMaxResource() 
*resources.Resource {
        return sa.getResourceFromTags(siCommon.AppTagNamespaceResourceQuota)
 }
 
+// GetMaxApps returns the max apps that is set in the application tags
+func (sa *Application) GetMaxApps() uint64 {
+       return sa.GetUint64Tag(siCommon.AppTagNamespaceResourceMaxApps)
+}
+
+func (sa *Application) GetUint64Tag(tag string) uint64 {

Review Comment:
   Nit: we don't need to export this.



##########
pkg/scheduler/partition.go:
##########
@@ -342,13 +342,19 @@ func (pc *PartitionContext) AddApplication(app 
*objects.Application) error {
 
        guaranteedRes := app.GetGuaranteedResource()
        maxRes := app.GetMaxResource()
-       if !isRecoveryQueue && (guaranteedRes != nil || maxRes != nil) {
+       maxApps := app.GetMaxApps()
+       if !isRecoveryQueue && (guaranteedRes != nil || maxRes != nil || 
maxApps != 0) {
                // set resources based on tags, but only if the queue is 
dynamic (unmanaged)
                if queue.IsManaged() {
                        log.Log(log.SchedQueue).Warn("Trying to set resources 
on a queue that is not an unmanaged leaf",
                                zap.String("queueName", queue.QueuePath))
                } else {
-                       queue.SetResources(guaranteedRes, maxRes)
+                       if maxApps != 0 {
+                               queue.SetMaxRunningApps(maxApps)

Review Comment:
   Could you cover this branch? 
   
   We have two existing test cases: `TestAddTGApplication` and 
`TestAddTGAppDynamic`.



##########
pkg/scheduler/objects/application_test.go:
##########
@@ -108,46 +108,121 @@ func TestNewApplication(t *testing.T) {
        assert.Assert(t, app.IsNew(), "new application must be in new state")
        assert.Equal(t, app.execTimeout, defaultPlaceholderTimeout, "no timeout 
passed in should be modified default")
        assert.Assert(t, resources.Equals(app.placeholderAsk, res), 
"placeholder ask not set as expected")
+}
 
+func TestNewApplicationWithAnnotaionUpdate(t *testing.T) {

Review Comment:
   typo: "annotaion"



##########
pkg/scheduler/objects/application_test.go:
##########
@@ -108,46 +108,121 @@ func TestNewApplication(t *testing.T) {
        assert.Assert(t, app.IsNew(), "new application must be in new state")
        assert.Equal(t, app.execTimeout, defaultPlaceholderTimeout, "no timeout 
passed in should be modified default")
        assert.Assert(t, resources.Equals(app.placeholderAsk, res), 
"placeholder ask not set as expected")
+}
 
+func TestNewApplicationWithAnnotaionUpdate(t *testing.T) {
+       user := security.UserGroup{
+               User:   "testuser",
+               Groups: []string{},
+       }
        // valid tags
-       siApp = &si.AddApplicationRequest{}
+       siApp := &si.AddApplicationRequest{}
        siApp.Tags = map[string]string{
                siCommon.AppTagNamespaceResourceQuota:      
"{\"resources\":{\"validMaxRes\":{\"value\":11}}}",
                siCommon.AppTagNamespaceResourceGuaranteed: 
"{\"resources\":{\"validGuaranteed\":{\"value\":22}}}",
+               siCommon.AppTagNamespaceResourceMaxApps:    "33",
        }
-       app = NewApplication(siApp, user, nil, "")
+
+       app := NewApplication(siApp, user, nil, "")
+
        guaranteed := app.GetGuaranteedResource()
        maxResource := app.GetMaxResource()
+       maxApps := app.GetMaxApps()
        assert.Assert(t, guaranteed != nil, "guaranteed resource has not been 
set")
        assert.Equal(t, 1, len(guaranteed.Resources), "more than one resource 
has been set")
        assert.Equal(t, resources.Quantity(22), 
guaranteed.Resources["validGuaranteed"])
        assert.Assert(t, maxResource != nil, "maximum resource has not been 
set")
        assert.Equal(t, 1, len(maxResource.Resources), "more than one resource 
has been set")
        assert.Equal(t, resources.Quantity(11), 
maxResource.Resources["validMaxRes"], "maximum resource is incorrect")
+       assert.Assert(t, maxApps != 0, "maximum apps has not been set or 
incorrect")
+       assert.Equal(t, uint64(33), maxApps, "maximum apps is incorrect")
+
+       // valid tags without max apps
+       siApp = &si.AddApplicationRequest{}
+       siApp.Tags = map[string]string{
+               siCommon.AppTagNamespaceResourceQuota:      
"{\"resources\":{\"validMaxRes\":{\"value\":11}}}",
+               siCommon.AppTagNamespaceResourceGuaranteed: 
"{\"resources\":{\"validGuaranteed\":{\"value\":22}}}",
+       }
+       app = NewApplication(siApp, user, nil, "")
+       guaranteed = app.GetGuaranteedResource()
+       maxResource = app.GetMaxResource()
+       maxApps = app.GetMaxApps()
+       assert.Assert(t, guaranteed != nil, "guaranteed resource has not been 
set")
+       assert.Equal(t, 1, len(guaranteed.Resources), "more than one resource 
has been set")
+       assert.Equal(t, resources.Quantity(22), 
guaranteed.Resources["validGuaranteed"])
+       assert.Assert(t, maxResource != nil, "maximum resource has not been 
set")
+       assert.Equal(t, 1, len(maxResource.Resources), "more than one resource 
has been set")
+       assert.Equal(t, resources.Quantity(11), 
maxResource.Resources["validMaxRes"], "maximum resource is incorrect")
+       assert.Assert(t, maxApps == 0, "maximum apps should have not been set")
 
        // invalid tags
        siApp = &si.AddApplicationRequest{}
        siApp.Tags = map[string]string{
                siCommon.AppTagNamespaceResourceQuota:      "{xxxxxx}",
                siCommon.AppTagNamespaceResourceGuaranteed: "{yyyyy}",
+               siCommon.AppTagNamespaceResourceMaxApps:    "zzzzz",
        }
        app = NewApplication(siApp, user, nil, "")
        guaranteed = app.GetGuaranteedResource()
        maxResource = app.GetMaxResource()
+       maxApps = app.GetMaxApps()
        assert.Assert(t, guaranteed == nil, "guaranteed resource should have 
not been set")
        assert.Assert(t, maxResource == nil, "maximum resource should have not 
been set")
+       assert.Assert(t, maxApps == 0, "maximum apps should have not been set 
or incorrect")
 
        // negative values
        siApp = &si.AddApplicationRequest{}
        siApp.Tags = map[string]string{
                siCommon.AppTagNamespaceResourceQuota:      
"{\"resources\":{\"negativeMax\":{\"value\":-11}}}",
                siCommon.AppTagNamespaceResourceGuaranteed: 
"{\"resources\":{\"negativeGuaranteed\":{\"value\":-22}}}",
+               siCommon.AppTagNamespaceResourceMaxApps:    "-33",
        }
        app = NewApplication(siApp, user, nil, "")
        guaranteed = app.GetGuaranteedResource()
        maxResource = app.GetMaxResource()
+       maxApps = app.GetMaxApps()
        assert.Assert(t, guaranteed == nil, "guaranteed resource should have 
not been set")
        assert.Assert(t, maxResource == nil, "maximum resource should have not 
been set")
+       assert.Assert(t, maxApps == 0, "maximum apps should have not been set 
or incorrect")
+
+       // test seperate max app cases to increase testing coverage

Review Comment:
   nit: comment not needed



##########
pkg/scheduler/objects/queue_test.go:
##########
@@ -2594,3 +2594,19 @@ func TestQueue_allocatedResFits(t *testing.T) {
                })
        }
 }
+
+func TestQueueSetMaxRunningApps(t *testing.T) {
+       queue := &Queue{}
+       maxApps := uint64(10)
+
+       queue.SetMaxRunningApps(maxApps)
+       assert.Equal(t, maxApps, queue.maxRunningApps)
+
+       queue = nil
+       queue.SetMaxRunningApps(maxApps)
+       defer func() {

Review Comment:
   The defer section should come earlier, otherwise it will not catch the panic



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