@Override
  public DelegationTokenInformation getToken(DelegationTokenIdentifier tokenIdentifier) {
    String tokenPath = getTokenPath(tokenIdentifier);
    byte[] tokenBytes = zkGetData(tokenPath);
    if(tokenBytes == null) {
      // The token is already removed.
      LOGGER.info("Could not get data from {}", tokenPath);
      return null;
    }
    try {
      return MetastoreDelegationTokenSupport.decodeDelegationTokenInformation(tokenBytes);
    } catch (Exception ex) {
      throw new TokenStoreException("Failed to decode token", ex);
    }
  }
Parse comma separated list of ACL entries to secure generated nodes, e.g.
<code>sasl:hive/host1@MY.DOMAIN:cdrwa,sasl:hive/host2@MY.DOMAIN:cdrwa</code>
@param aclString
@return ACL list
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/security/ZooKeeperTokenStore.java