private String readProcessorData(String fullPath) {
    try {
      String data = zkClient.readData(fullPath, true);
      metrics.reads.inc();
      return data;
    } catch (Exception e) {
      throw new SamzaException(String.format("Cannot read ZK node: %s", fullPath), e);
    }
  }
Method is used to read processor's data from the znode
@param fullPath absolute path to the znode
@return processor's data
@throws SamzaException when fullPath doesn't exist in zookeeper
or problems with connecting to zookeeper.
samza-core/src/main/java/org/apache/samza/zk/ZkUtils.java