olehborysevych commented on code in PR #25357:
URL: https://github.com/apache/beam/pull/25357#discussion_r1101464266


##########
playground/backend/internal/emulators/emulator.go:
##########
@@ -49,49 +55,51 @@ func PrepareMockClustersAndGetPrepareParams(request 
*pb.RunCodeRequest) ([]Emula
                datasetsByEmulatorTypeMap[dataset.Type] = datasets
        }
 
-       var prepareParams = make(map[string]string)
        var mockClusters = make([]EmulatorMockCluster, 0)
        for emulatorType, datasets := range datasetsByEmulatorTypeMap {
                switch emulatorType {
                case pb.EmulatorType_EMULATOR_TYPE_KAFKA:
-                       kafkaMockCluster, err := NewKafkaMockCluster()
+                       kafkaMockCluster, err := 
NewKafkaMockCluster(configuration.KafkaEmulatorExecutablePath)
                        if err != nil {
                                logger.Errorf("failed to run a kafka mock 
cluster, %v", err)
-                               return nil, nil, err
+                               return nil, err
                        }
                        mockClusters = append(mockClusters, kafkaMockCluster)
-                       datasetDTOs, err := toDatasetDTOs(datasets)

Review Comment:
   i think we can check this before creating mock cluster



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