public void writeTo(ByteBuffer byteBuffer) {
    byteBuffer.putInt(blobIds.size());
    for (BlobId blobId : blobIds) {
      byteBuffer.put(blobId.toBytes());
    }
  }
Contains the partition and the blob ids requested from a partition. This is used
by get request to specify the blob ids in a partition
ambry-protocol/src/main/java/com/github/ambry/protocol/PartitionRequestInfo.java