@Override
    public void doHandleChildChange(String parentPath, List<String> currentChildren)
        throws Exception {
      if (currentChildren == null) {
        LOG.info("handleChildChange on path " + parentPath + " was invoked with NULL list of children");
      } else {
        LOG.info("ProcessorChangeHandler::handleChildChange - Path: {} Current Children: {} ", parentPath, currentChildren);
        onProcessorChange(currentChildren);
      }
    }
Called when the children of the given path changed.

@param parentPath      The parent path
@param currentChildren The children or null if the root node (parent path) was deleted.
@throws Exception
samza-core/src/main/java/org/apache/samza/zk/ZkJobCoordinator.java