public void onAbortTxn(AbortTxnEvent abortTxnEvent, Connection dbConn, SQLGenerator sqlGenerator)
          throws MetaException {
  }
This will be called to abort a transaction.
@param abortTxnEvent event to be processed
@param dbConn jdbc connection to remote meta store db.
@param sqlGenerator helper class to generate db specific sql string.
@throws MetaException
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreEventListener.java