public void removeRegion(final RegionInfo regionInfo) {
    final byte[] encodedName = regionInfo.getEncodedNameAsBytes();
    storeFlushedSequenceIdsByRegion.remove(encodedName);
    flushedSequenceIdByRegion.remove(encodedName);
  }
Called by delete table and similar to notify the ServerManager that a region was removed.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java