TSultanov commented on code in PR #25357:
URL: https://github.com/apache/beam/pull/25357#discussion_r1102638950


##########
playground/backend/internal/emulators/kafka.go:
##########
@@ -31,43 +35,90 @@ import (
 )
 
 const (
-       brokerCount        = 1
        addressSeperator   = ":"
        pauseDuration      = 100 * time.Millisecond
-       globalDuration     = 2 * time.Second
+       globalDuration     = 120 * time.Second
        bootstrapServerKey = "bootstrap.servers"
        networkType        = "tcp"
        jsonExt            = ".json"
        avroExt            = ".avro"
 )
 
 type KafkaMockCluster struct {
-       cluster *kafka.MockCluster
-       host    string
-       port    string
+       cmd                *exec.Cmd
+       host               string
+       port               string
+       preparerParameters map[string]string
 }
 
-func NewKafkaMockCluster() (*KafkaMockCluster, error) {
-       cluster, err := kafka.NewMockCluster(brokerCount)
+func NewKafkaMockCluster(emulatorExecutablePath string) (*KafkaMockCluster, 
error) {
+       cmd := exec.Command("java", "-jar", emulatorExecutablePath)

Review Comment:
   We are building containers with `go1.18`. `os/exec.Cmd` doesn't have `Err` 
field in that version of Go: 
https://cs.opensource.google/go/go/+/refs/tags/go1.18.9:src/os/exec/exec.go;l=57



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