void setOperationRetryHandler(OperationRetryHandler operationRetryHandler) {
    this.operationRetryHandler = operationRetryHandler;
  }
Set the operation retry handler. Supposed to be used for testing.
@param operationRetryHandler the operation retry handler of type {@link OperationRetryHandler}
ambry-file-transfer/src/main/java/com/github/ambry/filetransfer/handler/StoreFileCopyHandler.java