Package org.apache.hadoop.hdfs.server.blockmanagement

Interface BlockCollection

All Known Implementing Classes:
INodeFile
@Private public interface BlockCollection
This interface is used by the block manager to expose a few characteristics of a collection of Block/BlockUnderConstruction.

  • Method Details

    • getLastBlock

      BlockInfo getLastBlock()
      Get the last block of the collection.

    • computeContentSummary

      org.apache.hadoop.fs.ContentSummary computeContentSummary(BlockStoragePolicySuite bsps) throws org.apache.hadoop.security.AccessControlException
      Get content summary.
      Throws:
      org.apache.hadoop.security.AccessControlException

    • numBlocks

      int numBlocks()
      Returns:
      the number of blocks or block groups

    • getBlocks

      BlockInfo[] getBlocks()
      Get the blocks (striped or contiguous).

    • getPreferredBlockSize

      long getPreferredBlockSize()
      Get preferred block size for the collection
      Returns:
      preferred block size in bytes

    • getPreferredBlockReplication

      short getPreferredBlockReplication()
      Get block replication for the collection.
      Returns:
      block replication value. Return 0 if the file is erasure coded.

    • getStoragePolicyID

      byte getStoragePolicyID()
      Returns:
      the storage policy ID.

    • getName

      String getName()
      Get the name of the collection.

    • setBlock

      void setBlock(int index, BlockInfo blk)
      Set the block (contiguous or striped) at the given index.

    • convertLastBlockToUC

      void convertLastBlockToUC(BlockInfo lastBlock, DatanodeStorageInfo[] targets) throws IOException
      Convert the last block of the collection to an under-construction block and set the locations.
      Throws:
      IOException

    • isUnderConstruction

      boolean isUnderConstruction()
      Returns:
      whether the block collection is under construction.

    • isStriped

      boolean isStriped()
      Returns:
      whether the block collection is in striping format

    • getId

      long getId()
      Returns:
      the id for the block collection