deniskuzZ commented on a change in pull request #1087: URL: https://github.com/apache/hive/pull/1087#discussion_r447509066
########## File path: standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnHandler.java ########## @@ -2032,28 +2077,61 @@ public void seedWriteIdOnAcidConversion(InitializeTableWriteIdsRequest rqst) // The initial value for write id should be 1 and hence we add 1 with number of write ids // allocated here String s = "INSERT INTO \"NEXT_WRITE_ID\" (\"NWI_DATABASE\", \"NWI_TABLE\", \"NWI_NEXT\") VALUES (?, ?, " - + Long.toString(rqst.getSeeWriteId() + 1) + ")"; - pst = sqlGenerator.prepareStmtWithParameters(dbConn, s, Arrays.asList(rqst.getDbName(), rqst.getTblName())); + + Long.toString(rqst.getSeedWriteId() + 1) + ")"; + pst = sqlGenerator.prepareStmtWithParameters(dbConn, s, Arrays.asList(rqst.getDbName(), rqst.getTableName())); LOG.debug("Going to execute insert <" + s.replaceAll("\\?", "{}") + ">", - quoteString(rqst.getDbName()), quoteString(rqst.getTblName())); + quoteString(rqst.getDbName()), quoteString(rqst.getTableName())); pst.execute(); LOG.debug("Going to commit"); dbConn.commit(); } catch (SQLException e) { - LOG.debug("Going to rollback"); rollbackDBConn(dbConn); - checkRetryable(dbConn, e, "seedWriteIdOnAcidConversion(" + rqst + ")"); - throw new MetaException("Unable to update transaction database " - + StringUtils.stringifyException(e)); + checkRetryable(dbConn, e, "seedWriteId(" + rqst + ")"); + throw new MetaException("Unable to update transaction database " + StringUtils.stringifyException(e)); } finally { close(null, pst, dbConn); unlockInternal(); } } catch (RetryException e) { - seedWriteIdOnAcidConversion(rqst); + seedWriteId(rqst); } + } + + @Override + public void seedTxnId(SeedTxnIdRequest rqst) throws MetaException { + try { + Connection dbConn = null; + Statement stmt = null; + try { + lockInternal(); + dbConn = getDbConn(Connection.TRANSACTION_READ_COMMITTED); + stmt = dbConn.createStatement(); + /* + * Locking the txnLock an exclusive way, we do not want to set the txnId backward accidentally + * if there are concurrent open transactions + */ + acquireTxnLock(stmt, false); + long highWaterMark = getHighWaterMark(stmt); + if (highWaterMark >= rqst.getSeedTxnId()) { Review comment: not quite understand this if condition. You have check in validateAndAddMaxTxnIdAndWriteId() if there are already some write ids registered in HMS and we try to do repair - throw exception. Could it be possible due to lack of locking that when we calculate the write ids there is nothing in HMS, however when we try to seed - some transaction generates a new write id - would it cause some dataloss problems or other issues? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org