private void logCallStack(StackTraceElement[] stackTraceElements) {
    StringBuilder stackBuilder = new StringBuilder("Call stack:");
    for (StackTraceElement element : stackTraceElements) {
      stackBuilder.append("\n    at ");
      stackBuilder.append(element);
    }
    stackBuilder.append("\n");
    LOG.debug(stackBuilder.toString());
  }
If choreService has not been created yet, create the ChoreService.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java