public void setAzureBlobInfo(HashMap<String, MessageInfo> azureBlobMap) {
    if (azureBlobMap == null) {
      logger.error("Azure blob map cannot be null");
      return;
    }
    this.azureBlobMap = azureBlobMap;
  }
Return the {@link BackupCheckerFileManager}. This is only for test
@return
ambry-replication/src/main/java/com/github/ambry/replication/BackupCheckerThread.java