Package com.illumon.iris.db.v2.sources.chunk.kernels

Class BlockZipperSplitter

java.lang.Object
com.illumon.iris.db.v2.sources.chunk.kernels.BlockZipperSplitter
public class BlockZipperSplitter
extends Object
Special purpose kernel used when a rehashing operation occurs in the middle of a BlockZipper/block number session: Effectively in such a case the number of blocks and the mask used for those blocks changes, but BlockZipper cannot resume a block data collection for a given block number after the block count has changed. Instead we'll continue using block zipper for the same block number (based on the pre-rehash numbering) and subsequently split the result according to the new block mapping

  • Constructor Summary

    Constructors 
    Constructor Description
    BlockZipperSplitter​(BlockZipper blockZipper)
    Builds a BlockZipperSplitter associated to a given BlockZipper

  • Method Summary

    Modifier and Type Method Description
    com.illumon.iris.db.v2.sources.chunk.kernels.BlockZipperSplitter.Context getContext​(int logChunkCount, int chunkSize, int logBlockCount)
    Creates a context for the current set of operations
    IntChunk[] splitByPositions​(com.illumon.iris.db.v2.sources.chunk.kernels.BlockZipperSplitter.Context context, int blockNumberShift, IntChunk inputPosition, IntChunk... hashChunks)
    Split the inputPosition according the the values they are pointing to

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • BlockZipperSplitter

      public BlockZipperSplitter​(BlockZipper blockZipper)
      Builds a BlockZipperSplitter associated to a given BlockZipper
      Parameters:
      blockZipper -

  • Method Details

    • splitByPositions

      public IntChunk[] splitByPositions​(com.illumon.iris.db.v2.sources.chunk.kernels.BlockZipperSplitter.Context context, int blockNumberShift, IntChunk inputPosition, IntChunk... hashChunks)
      Split the inputPosition according the the values they are pointing to
      Parameters:
      context -
      blockNumberShift - - The number of bits the hash value is shifted to produce the hash block
      inputPosition - - The positions to be split
      hashChunks - - The chunks storing the hash values
      Returns:
      Positions split by block number

    • getContext

      public com.illumon.iris.db.v2.sources.chunk.kernels.BlockZipperSplitter.Context getContext​(int logChunkCount, int chunkSize, int logBlockCount)
      Creates a context for the current set of operations
      Parameters:
      logChunkCount - - The base 2 logarithm of the order of the split (i.e. the number of hash table resize operations happened while we were inserting data to the same block
      chunkSize - - The size of the result chunks
      logBlockCount - - The logarithm of the current block count