@Override
  public String toString() {
    return "FilePiecePayload{fileName="
        + fileName
        + ", nextWritingOffset="
        + nextWritingOffset
        + ", filePiece="
        + formatByteArray(filePiece, 64)
        + "}";
  }
The piece of the file content.
iotdb-client/service-rpc/src/main/java/org/apache/iotdb/rpc/subscription/payload/poll/FilePiecePayload.java