@Override
  public void removeCompactedFiles(Collection<HStoreFile> compactedFiles) {
    // See class comment for the assumptions we make here.
    LOG.debug("Attempting to delete compaction results: " + compactedFiles.size());
    // In order to be able to fail in the middle of the operation, we'll operate on lazy
    // copies and apply the result at the end.
    CompactionOrFlushMergeCopy cmc = new CompactionOrFlushMergeCopy(false);
    cmc.deleteResults(compactedFiles);
    debugDumpState("Deleted compaction results");
  }
Override of getSplitPoint that determines the split point as the boundary between two stripes,
unless it causes significant imbalance between split sides' sizes. In that case, the split
boundary will be chosen from the middle of one of the stripes to minimize imbalance.
@return The split point, or null if no split is possible.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StripeStoreFileManager.java