Package org.apache.bookkeeper.mledger.offload.jcloud

Interface DataBlockHeader

All Known Implementing Classes:
DataBlockHeaderImpl, StreamingDataBlockHeaderImpl
@Unstable public interface DataBlockHeader
The data block header in tiered storage for each data block.

Currently, It is in format: [ magic_word -- int ][ block_len -- int ][ first_entry_id -- long][padding] with the size: 4 + 4 + 8 + padding = 128 Bytes

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    getBlockLength()
    Get the length of the block in bytes, including the header.
    long
    getFirstEntryId()
    Get the message entry Id for the first message that stored in this data block.
    long
    getHeaderLength()
    Get the size of this DataBlockHeader.
    InputStream
    toStream()
    Get the content of the data block header as InputStream.

  • Method Details

    • getBlockLength

      long getBlockLength()
      Get the length of the block in bytes, including the header.

    • getFirstEntryId

      long getFirstEntryId()
      Get the message entry Id for the first message that stored in this data block.

    • getHeaderLength

      long getHeaderLength()
      Get the size of this DataBlockHeader.

    • toStream

      InputStream toStream()
      Get the content of the data block header as InputStream. Read out in current format.