HFileBlockIndex.java 文件源码

/**
 * Adds a new entry to this block index chunk.
 *
 * @param firstKey the first key in the block pointed to by this entry
 * @param blockOffset the offset of the next-level block pointed to by this
 *          entry
 * @param onDiskDataSize the on-disk data of the block pointed to by this
 *          entry, including header size
 * @param curTotalNumSubEntries if this chunk is the root index chunk under
 *          construction, this specifies the current total number of
 *          sub-entries in all leaf-level chunks, including the one
 *          corresponding to the second-level entry being added.
 */
void add(byte[] firstKey, long blockOffset, int onDiskDataSize,
    long curTotalNumSubEntries) {
  // Record the offset for the secondary index
  secondaryIndexOffsetMarks.add(curTotalNonRootEntrySize);
  curTotalNonRootEntrySize += SECONDARY_INDEX_ENTRY_OVERHEAD
      + firstKey.length;

  curTotalRootSize += Bytes.SIZEOF_LONG + Bytes.SIZEOF_INT
      + WritableUtils.getVIntSize(firstKey.length) + firstKey.length;

  blockKeys.add(firstKey);
  blockOffsets.add(blockOffset);
  onDiskDataSizes.add(onDiskDataSize);

  if (curTotalNumSubEntries != -1) {
    numSubEntriesAt.add(curTotalNumSubEntries);

    // Make sure the parallel arrays are in sync.
    if (numSubEntriesAt.size() != blockKeys.size()) {
      throw new IllegalStateException("Only have key/value count " +
          "stats for " + numSubEntriesAt.size() + " block index " +
          "entries out of " + blockKeys.size());
    }
  }
}