RocMarshal commented on code in PR #2: URL: https://github.com/apache/flink-connector-jdbc/pull/2#discussion_r1441443240
########## flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/sink/JdbcSinkBuilder.java: ########## @@ -0,0 +1,76 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.connector.jdbc.sink; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.jdbc.JdbcConnectionOptions; +import org.apache.flink.connector.jdbc.JdbcExecutionOptions; +import org.apache.flink.connector.jdbc.JdbcStatementBuilder; +import org.apache.flink.connector.jdbc.internal.connection.JdbcConnectionProvider; +import org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider; +import org.apache.flink.connector.jdbc.sink.statement.JdbcQueryStatement; +import org.apache.flink.connector.jdbc.sink.statement.SimpleJdbcQueryStatement; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** Builder to construct {@link JdbcSink}. */ +@PublicEvolving +public class JdbcSinkBuilder<IN> { + + private JdbcConnectionProvider connectionProvider; + private JdbcExecutionOptions executionOptions; + private JdbcQueryStatement<IN> queryStatement; + + public JdbcSinkBuilder() { + executionOptions = JdbcExecutionOptions.defaults(); + } + + public JdbcSinkBuilder<IN> withExecutionOptions(JdbcExecutionOptions executionOptions) { + this.executionOptions = checkNotNull(executionOptions, "executionOptions cannot be empty"); + return this; + } + + private JdbcSinkBuilder<IN> withConnectionProvider(JdbcConnectionProvider connectionProvider) { + this.connectionProvider = + checkNotNull(connectionProvider, "connectionProvider cannot be empty"); Review Comment: ditto ########## flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/sink/JdbcSinkBuilder.java: ########## @@ -0,0 +1,76 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.connector.jdbc.sink; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.jdbc.JdbcConnectionOptions; +import org.apache.flink.connector.jdbc.JdbcExecutionOptions; +import org.apache.flink.connector.jdbc.JdbcStatementBuilder; +import org.apache.flink.connector.jdbc.internal.connection.JdbcConnectionProvider; +import org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider; +import org.apache.flink.connector.jdbc.sink.statement.JdbcQueryStatement; +import org.apache.flink.connector.jdbc.sink.statement.SimpleJdbcQueryStatement; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** Builder to construct {@link JdbcSink}. */ +@PublicEvolving +public class JdbcSinkBuilder<IN> { + + private JdbcConnectionProvider connectionProvider; + private JdbcExecutionOptions executionOptions; + private JdbcQueryStatement<IN> queryStatement; + + public JdbcSinkBuilder() { + executionOptions = JdbcExecutionOptions.defaults(); + } + + public JdbcSinkBuilder<IN> withExecutionOptions(JdbcExecutionOptions executionOptions) { + this.executionOptions = checkNotNull(executionOptions, "executionOptions cannot be empty"); Review Comment: The 'empty' in the hint message could be 'null' ? Because this corresponds more rigorously to the verification logic ########## flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/sink/JdbcSinkBuilder.java: ########## @@ -0,0 +1,76 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.connector.jdbc.sink; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.jdbc.JdbcConnectionOptions; +import org.apache.flink.connector.jdbc.JdbcExecutionOptions; +import org.apache.flink.connector.jdbc.JdbcStatementBuilder; +import org.apache.flink.connector.jdbc.internal.connection.JdbcConnectionProvider; +import org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider; +import org.apache.flink.connector.jdbc.sink.statement.JdbcQueryStatement; +import org.apache.flink.connector.jdbc.sink.statement.SimpleJdbcQueryStatement; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** Builder to construct {@link JdbcSink}. */ +@PublicEvolving +public class JdbcSinkBuilder<IN> { + + private JdbcConnectionProvider connectionProvider; + private JdbcExecutionOptions executionOptions; + private JdbcQueryStatement<IN> queryStatement; + + public JdbcSinkBuilder() { + executionOptions = JdbcExecutionOptions.defaults(); + } + + public JdbcSinkBuilder<IN> withExecutionOptions(JdbcExecutionOptions executionOptions) { + this.executionOptions = checkNotNull(executionOptions, "executionOptions cannot be empty"); + return this; + } + + private JdbcSinkBuilder<IN> withConnectionProvider(JdbcConnectionProvider connectionProvider) { + this.connectionProvider = + checkNotNull(connectionProvider, "connectionProvider cannot be empty"); + return this; + } + + public JdbcSinkBuilder<IN> withConnectionProvider(JdbcConnectionOptions connectionOptions) { + return withConnectionProvider(new SimpleJdbcConnectionProvider(connectionOptions)); + } + + public JdbcSinkBuilder<IN> withQueryStatement(JdbcQueryStatement<IN> queryStatement) { + this.queryStatement = queryStatement; + return this; + } + + public JdbcSinkBuilder<IN> withQueryStatement( + String query, JdbcStatementBuilder<IN> statement) { + this.queryStatement = new SimpleJdbcQueryStatement<>(query, statement); + return this; + } + + public JdbcSink<IN> build() { + checkNotNull(connectionProvider, "connectionProvider cannot be empty"); + checkNotNull(executionOptions, "executionOptions cannot be empty"); + checkNotNull(queryStatement, "queryStatement cannot be empty"); Review Comment: ditto ########## flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/datasource/transactions/xa/XaTransaction.java: ########## @@ -0,0 +1,295 @@ +package org.apache.flink.connector.jdbc.datasource.transactions.xa; + +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.connector.jdbc.JdbcExactlyOnceOptions; +import org.apache.flink.connector.jdbc.datasource.connections.xa.XaConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.transactions.xa.domain.TransactionId; +import org.apache.flink.connector.jdbc.datasource.transactions.xa.exceptions.EmptyTransactionXaException; +import org.apache.flink.connector.jdbc.datasource.transactions.xa.exceptions.TransientXaException; +import org.apache.flink.connector.jdbc.sink.writer.JdbcWriterState; +import org.apache.flink.util.ExceptionUtils; +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.transaction.xa.Xid; + +import java.io.IOException; +import java.io.Serializable; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Deque; +import java.util.Iterator; +import java.util.LinkedList; +import java.util.List; + +/** */ +public class XaTransaction implements Serializable, AutoCloseable { + + private static final Logger LOG = LoggerFactory.getLogger(XaTransaction.class); + + private final XaConnectionProvider xaConnectionProvider; + private final JdbcExactlyOnceOptions exactlyOnceOptions; + + // checkpoints and the corresponding transactions waiting for completion notification from JM + private transient List<TransactionId> preparedXids = new ArrayList<>(); + // hanging XIDs - used for cleanup + // it's a list to support retries and scaling down + // possible transaction states: active, idle, prepared + // last element is the current xid + private transient Deque<TransactionId> hangingXids = new LinkedList<>(); + private transient TransactionId currentTid; + + private final TransactionId baseTransaction; + + public XaTransaction( + JdbcExactlyOnceOptions exactlyOnceOptions, + TransactionId transactionId, + XaConnectionProvider xaFacade) { + this.xaConnectionProvider = xaFacade; + this.exactlyOnceOptions = exactlyOnceOptions; + this.baseTransaction = transactionId; + } + + public Xid getCurrentXid() { + return currentTid; + } + + public XaConnectionProvider getConnectionProvider() { + return xaConnectionProvider; + } + + public JdbcWriterState getState() { + return JdbcWriterState.of(preparedXids, hangingXids); + } + + public void open(JdbcWriterState state) throws IOException { + try { + xaConnectionProvider.open(); + recoverState(state); + hangingXids = new LinkedList<>(failOrRollback(hangingXids).getForRetry()); + commitTx(); + if (exactlyOnceOptions.isDiscoverAndRollbackOnRecovery()) { + // Pending transactions which are not included into the checkpoint might hold locks + // and + // should be rolled back. However, rolling back ALL transactions can cause data + // loss. So + // each subtask first commits transactions from its state and then rolls back + // discovered + // transactions if they belong to it. + recoverAndRollback(); + } + } catch (Exception e) { + ExceptionUtils.rethrowIOException(e); + } + } + + @Override + public void close() throws Exception { + if (currentTid != null && xaConnectionProvider.isOpen()) { + try { + LOG.debug( + "remove current transaction before closing, xid={}", + currentTid.getXidValue()); + xaConnectionProvider.failAndRollback(currentTid); + } catch (Exception e) { + LOG.warn( + "unable to fail/rollback current transaction, xid={}", + currentTid.getXidValue(), + e); + } + } + xaConnectionProvider.close(); + currentTid = null; + hangingXids = null; + preparedXids = null; + } + + public void recoverState(JdbcWriterState state) { + hangingXids = new LinkedList<>(state.getHanging()); + preparedXids = new ArrayList<>(state.getPrepared()); + LOG.info( + "initialized state: prepared xids: {}, hanging xids: {}", + preparedXids.size(), + hangingXids.size()); + } + + public void checkState() { + Preconditions.checkState(currentTid != null, "current xid must not be null"); + Preconditions.checkState( + !hangingXids.isEmpty() && hangingXids.peekLast().equals(currentTid), + "inconsistent internal state"); + } + + /** @param checkpointId to associate with the new transaction. */ + public void createTx(long checkpointId) throws IOException { + try { + Preconditions.checkState(currentTid == null, "currentXid not null"); + currentTid = baseTransaction.withBranch(checkpointId); + hangingXids.offerLast(currentTid); + xaConnectionProvider.start(currentTid); + } catch (Exception e) { + ExceptionUtils.rethrowIOException(e); + } + } + + public void prepareTx() throws IOException { + checkState(); + hangingXids.pollLast(); + try { + xaConnectionProvider.endAndPrepare(currentTid); + preparedXids.add(currentTid); + } catch (EmptyTransactionXaException e) { + LOG.info( + "empty XA transaction (skip), xid: {}, checkpoint {}", + currentTid.getXidValue(), + currentTid.getCheckpointId()); + } catch (Exception e) { + ExceptionUtils.rethrowIOException(e); + } + currentTid = null; + } + + public void commitTx() { + List<TransactionId> toCommit = preparedXids; + preparedXids = new ArrayList<>(); + preparedXids.addAll(commitXids(toCommit)); + } + + public void commitTxUntil(long checkpointId) { + Tuple2<List<TransactionId>, List<TransactionId>> splittedXids = + split(preparedXids, checkpointId); + + if (splittedXids.f0.isEmpty()) { + LOG.warn("nothing to commit up to checkpoint: {}", checkpointId); + } else { + preparedXids = splittedXids.f1; + preparedXids.addAll(commitXids(splittedXids.f0)); + } + } + + public List<TransactionId> commitXids(List<TransactionId> xids) { + return commit( + xids, + exactlyOnceOptions.isAllowOutOfOrderCommits(), + exactlyOnceOptions.getMaxCommitAttempts()) + .getForRetry(); + } + + private Tuple2<List<TransactionId>, List<TransactionId>> split( + List<TransactionId> list, long checkpointId) { + return split(list, checkpointId, true); + } + + private Tuple2<List<TransactionId>, List<TransactionId>> split( + List<TransactionId> list, long checkpointId, boolean checkpointIntoLo) { + + List<TransactionId> lo = new ArrayList<>(list.size() / 2); + List<TransactionId> hi = new ArrayList<>(list.size() / 2); + list.forEach( + i -> { + if (i.getCheckpointId() < checkpointId + || (i.getCheckpointId() == checkpointId && checkpointIntoLo)) { + lo.add(i); + } else { + hi.add(i); + } + }); + return new Tuple2<>(lo, hi); + } + + private XaTransactionResult<TransactionId> commit( + List<TransactionId> xids, boolean allowOutOfOrderCommits, int maxCommitAttempts) { + XaTransactionResult<TransactionId> result = new XaTransactionResult<>(); + int origSize = xids.size(); + LOG.debug("commit {} transactions", origSize); + for (Iterator<TransactionId> i = xids.iterator(); + i.hasNext() && (result.hasNoFailures() || allowOutOfOrderCommits); ) { + TransactionId x = i.next(); + i.remove(); + try { + xaConnectionProvider.commit(x, x.getRestored()); + result.succeeded(x); + } catch (TransientXaException e) { + result.failedTransiently(x.withAttemptsIncremented(), e); + } catch (Exception e) { + result.failed(x, e); + } + } + result.getForRetry().addAll(xids); + result.throwIfAnyFailed("commit"); + throwIfAnyReachedMaxAttempts(result, maxCommitAttempts); + result.getTransientFailure() + .ifPresent( + f -> + LOG.warn( + "failed to commit {} transactions out of {} (keep them to retry later)", + result.getForRetry().size(), + origSize, + f)); + return result; + } + + private XaTransactionResult<TransactionId> failOrRollback(Collection<TransactionId> xids) { + XaTransactionResult<TransactionId> result = new XaTransactionResult<>(); + if (xids.isEmpty()) { + return result; + } + if (LOG.isDebugEnabled()) { + LOG.debug("rolling back {} transactions: {}", xids.size(), xids); + } + for (TransactionId x : xids) { + try { + xaConnectionProvider.failAndRollback(x); + result.succeeded(x); + } catch (TransientXaException e) { + LOG.info("unable to fail/rollback transaction, xid={}: {}", x, e.getMessage()); + result.failedTransiently(x, e); + } catch (Exception e) { + LOG.warn("unable to fail/rollback transaction, xid={}: {}", x, e.getMessage()); + result.failed(x, e); + } + } + if (!result.getForRetry().isEmpty()) { + LOG.info("failed to roll back {} transactions", result.getForRetry().size()); + } + return result; + } + + private void recoverAndRollback() { + Collection<Xid> recovered = xaConnectionProvider.recover(); + if (recovered.isEmpty()) { + return; + } + LOG.warn("rollback {} recovered transactions", recovered.size()); + for (Xid xid : recovered) { + if (baseTransaction.belongsTo(xid)) { + try { + xaConnectionProvider.rollback(xid); + } catch (Exception e) { + LOG.info("unable to rollback recovered transaction, xid={}", xid, e); + } + } + } + } + + private void throwIfAnyReachedMaxAttempts( + XaTransactionResult<TransactionId> result, int maxAttempts) { + List<TransactionId> reached = null; + for (TransactionId x : result.getForRetry()) { + if (x.getAttempts() >= maxAttempts) { + if (reached == null) { + reached = new ArrayList<>(); + } + reached.add(x); + } + } + if (reached != null) { Review Comment: Maybe `Precondition` utils is the better option. ########## flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/sink/JdbcSinkBuilder.java: ########## @@ -0,0 +1,117 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.connector.jdbc.sink; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.connector.base.DeliveryGuarantee; +import org.apache.flink.connector.jdbc.JdbcConnectionOptions; +import org.apache.flink.connector.jdbc.JdbcExactlyOnceOptions; +import org.apache.flink.connector.jdbc.JdbcExecutionOptions; +import org.apache.flink.connector.jdbc.JdbcStatementBuilder; +import org.apache.flink.connector.jdbc.datasource.connections.JdbcConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.connections.SimpleJdbcConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.connections.xa.PoolingXaConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.connections.xa.SimpleXaConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.connections.xa.XaConnectionProvider; +import org.apache.flink.connector.jdbc.datasource.statements.JdbcQueryStatement; +import org.apache.flink.connector.jdbc.datasource.statements.SimpleJdbcQueryStatement; +import org.apache.flink.util.function.SerializableSupplier; + +import javax.sql.XADataSource; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** Builder to construct {@link JdbcSink}. */ +@PublicEvolving +public class JdbcSinkBuilder<IN> { + + private JdbcExecutionOptions executionOptions; + private JdbcQueryStatement<IN> queryStatement; + + public JdbcSinkBuilder() { + this.executionOptions = JdbcExecutionOptions.defaults(); + } + + public JdbcSinkBuilder<IN> withExecutionOptions(JdbcExecutionOptions executionOptions) { + this.executionOptions = checkNotNull(executionOptions, "executionOptions cannot be empty"); + return this; + } + + public JdbcSinkBuilder<IN> withQueryStatement(JdbcQueryStatement<IN> queryStatement) { + this.queryStatement = queryStatement; + return this; + } + + public JdbcSinkBuilder<IN> withQueryStatement( + String query, JdbcStatementBuilder<IN> statement) { + this.queryStatement = new SimpleJdbcQueryStatement<>(query, statement); + return this; + } + + public JdbcSink<IN> buildAtLeastOnce(JdbcConnectionOptions connectionOptions) { + checkNotNull(connectionOptions, "connectionOptions cannot be empty"); + + return buildAtLeastOnce(new SimpleJdbcConnectionProvider(connectionOptions)); + } + + public JdbcSink<IN> buildAtLeastOnce(JdbcConnectionProvider connectionProvider) { + checkNotNull(connectionProvider, "connectionProvider cannot be empty"); + + return build( + DeliveryGuarantee.AT_LEAST_ONCE, + JdbcExactlyOnceOptions.defaults(), + checkNotNull(connectionProvider, "connectionProvider cannot be empty")); + } + + public JdbcSink<IN> buildExactlyOnce( + JdbcExactlyOnceOptions exactlyOnceOptions, + SerializableSupplier<XADataSource> dataSourceSupplier) { + + checkNotNull(exactlyOnceOptions, "exactlyOnceOptions cannot be empty"); + checkNotNull(dataSourceSupplier, "dataSourceSupplier cannot be empty"); + XaConnectionProvider connectionProvider = + exactlyOnceOptions.isTransactionPerConnection() + ? PoolingXaConnectionProvider.from( + dataSourceSupplier, exactlyOnceOptions.getTimeoutSec()) + : SimpleXaConnectionProvider.from( + dataSourceSupplier, exactlyOnceOptions.getTimeoutSec()); + return buildExactlyOnce(exactlyOnceOptions, connectionProvider); + } + + public JdbcSink<IN> buildExactlyOnce( + JdbcExactlyOnceOptions exactlyOnceOptions, XaConnectionProvider connectionProvider) { + + return build( + DeliveryGuarantee.EXACTLY_ONCE, + checkNotNull(exactlyOnceOptions, "exactlyOnceOptions cannot be empty"), + checkNotNull(connectionProvider, "connectionProvider cannot be empty")); + } + + private JdbcSink<IN> build( + DeliveryGuarantee deliveryGuarantee, + JdbcExactlyOnceOptions exactlyOnceOptions, + JdbcConnectionProvider connectionProvider) { + + return new JdbcSink<>( + checkNotNull(deliveryGuarantee, "deliveryGuarantee cannot be empty"), + checkNotNull(connectionProvider, "connectionProvider cannot be empty"), + checkNotNull(executionOptions, "executionOptions cannot be empty"), + checkNotNull(exactlyOnceOptions, "exactlyOnceOptions cannot be empty"), + checkNotNull(queryStatement, "queryStatement cannot be empty")); Review Comment: ditto. -- This is an automated message from the Apache Git Service. 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