@Override
  public String toString() {
    return "RepairRequestRecord[blobId=" + blobId + ",partitionId=" + partitionId + ",sourceHostName=" + sourceHostName
        + ",sourceHostPort=" + sourceHostPort + ",operationType=" + operationType + ",operationTimeMs="
        + operationTimeMs + ",lifeVersion=" + lifeVersion + ",expirationTimeMs=" + expirationTimeMs + "]";
  }
@return the expiration time in milliseconds of the ttl expiration time.
ambry-api/src/main/java/com/github/ambry/repair/RepairRequestRecord.java