diff --git a/pkg/udf/reduce_udf.go b/pkg/udf/reduce_udf.go
index ea2bdc1031..d702a0f5e1 100644
--- a/pkg/udf/reduce_udf.go
+++ b/pkg/udf/reduce_udf.go
@@ -49,6 +49,7 @@ import (
 	"github.com/numaproj/numaflow/pkg/window"
 	"github.com/numaproj/numaflow/pkg/window/strategy/fixed"
 	"github.com/numaproj/numaflow/pkg/window/strategy/session"
+	"github.com/numaproj/numaflow/pkg/window/strategy/sliding"
 )
 
 type ReduceUDFProcessor struct {
@@ -142,7 +143,7 @@ func (u *ReduceUDFProcessor) Start(ctx context.Context) error {
 	if windowType.Fixed != nil {
 		windower = fixed.NewWindower(windowType.Fixed.Length.Duration)
 	} else if windowType.Sliding != nil {
-		windower = fixed.NewWindower(windowType.Sliding.Length.Duration)
+		windower = sliding.NewWindower(windowType.Sliding.Length.Duration, windowType.Sliding.Slide.Duration)
 	} else if windowType.Session != nil {
 		windower = session.NewWindower(windowType.Session.Timeout.Duration)
 	} else {
diff --git a/test/idle-source-e2e/idle_source_test.go b/test/idle-source-e2e/idle_source_test.go
index 0bcaf9d818..d53d792327 100644
--- a/test/idle-source-e2e/idle_source_test.go
+++ b/test/idle-source-e2e/idle_source_test.go
@@ -45,7 +45,7 @@ func (is *IdleSourceSuite) TestIdleKeyedReducePipeline() {
 	done := make(chan struct{})
 	go func() {
 		// publish messages to source vertex, with event time starting from 60000
-		startTime := 100
+		startTime := 1000
 		for i := 0; true; i++ {
 			select {
 			case <-ctx.Done():
diff --git a/test/idle-source-e2e/testdata/idle-source-reduce-pipeline.yaml b/test/idle-source-e2e/testdata/idle-source-reduce-pipeline.yaml
index b7410a1807..6a3147197d 100644
--- a/test/idle-source-e2e/testdata/idle-source-reduce-pipeline.yaml
+++ b/test/idle-source-e2e/testdata/idle-source-reduce-pipeline.yaml
@@ -8,8 +8,6 @@ spec:
       threshold: 5s # The pipeline will be considered idle if the source has not emitted any data for given threshold value.
       incrementBy: 3s # If source is found to be idle then increment the watermark by given incrementBy value.
       stepInterval: 2s # If source is idling then publish the watermark only when step interval has passed.
-  limits:
-    readBatchSize: 50
   vertices:
     - name: in
       scale:
diff --git a/test/reduce-e2e/testdata/complex-sliding-window-pipeline.yaml b/test/reduce-e2e/testdata/complex-sliding-window-pipeline.yaml
index 202ee6eda1..16d8b7217a 100644
--- a/test/reduce-e2e/testdata/complex-sliding-window-pipeline.yaml
+++ b/test/reduce-e2e/testdata/complex-sliding-window-pipeline.yaml
@@ -57,7 +57,6 @@ spec:
           storage:
             emptyDir: {}
     - name: sink
-      partitions: 2
       scale:
         min: 1
       sink:
diff --git a/test/sideinputs-e2e/testdata/reduce-sideinput-pipeline.yaml b/test/sideinputs-e2e/testdata/reduce-sideinput-pipeline.yaml
index d45d335fe3..b5ac6e9fc0 100644
--- a/test/sideinputs-e2e/testdata/reduce-sideinput-pipeline.yaml
+++ b/test/sideinputs-e2e/testdata/reduce-sideinput-pipeline.yaml
@@ -27,7 +27,7 @@ spec:
       udf:
         container:
           # A reduce side input udf, see https://github.com/numaproj-contrib/e2e-tests-go/tree/main/reduce-side-input/udf
-          image: "quay.io/numaio/numaproj-contrib/e2e-reduce-sideinput-example:dev"
+          image: "quay.io/numaio/numaproj-contrib/e2e-reduce-sideinput-udf:dev"
           imagePullPolicy: Always
         groupBy:
           window: