public static ValidTxnWriteIdList getValidTxnWriteIdList(Configuration conf) {
    String txnString = conf.get(ValidTxnWriteIdList.VALID_TABLES_WRITEIDS_KEY);
    return ValidTxnWriteIdList.fromValue(txnString);
  }
Get the ValidTxnWriteIdList saved in the configuration.
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java