public boolean preDelete(final Delete delete, final WALEdit edit) throws IOException {
    if (this.coprocEnvironments.isEmpty()) {
      return false;
    }
    boolean bypassable = true;
    return execOperation(new RegionObserverOperationWithoutResult(bypassable) {
      @Override
      public void call(RegionObserver observer) throws IOException {
        observer.preDelete(this, delete, edit);
      }
    });
  }
Supports Coprocessor 'bypass'.
@param delete The Delete object
@param edit   The WALEdit object.
@return true if default processing should be bypassed
@exception IOException Exception
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionCoprocessorHost.java