@Override
  protected void createWriterThreads(int numThreads) throws IOException {
    for (int i = 0; i < numThreads; ++i) {
      HBaseWriterThread writer = new HBaseWriterThreadWithACL(i);
      writers.add(writer);
    }
  }
MultiThreadedWriter that helps in testing ACL
hbase-diagnostics/src/main/java/org/apache/hadoop/hbase/util/MultiThreadedWriterWithACL.java