KV<Serde, Serde> getInputSerdes(String streamId) {
    if (!inEdges.containsKey(streamId)) {
      return null;
    }
    return appDesc.getStreamSerdes(streamId);
  }
Generate the configs for a job
@param executionPlanJson JSON representation of the execution plan
@return config of the job
samza-core/src/main/java/org/apache/samza/execution/JobNode.java