pvary commented on code in PR #10484: URL: https://github.com/apache/iceberg/pull/10484#discussion_r1724703605
########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/JdbcLockFactory.java: ########## @@ -0,0 +1,246 @@ +/* + * 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.iceberg.flink.maintenance.operator; + +import java.io.IOException; +import java.sql.DatabaseMetaData; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.sql.SQLNonTransientConnectionException; +import java.sql.SQLTimeoutException; +import java.sql.SQLTransientConnectionException; +import java.util.Map; +import java.util.UUID; +import org.apache.iceberg.jdbc.JdbcClientPool; +import org.apache.iceberg.jdbc.UncheckedInterruptedException; +import org.apache.iceberg.jdbc.UncheckedSQLException; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.util.PropertyUtil; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class JdbcLockFactory implements TriggerLockFactory { + private static final Logger LOG = LoggerFactory.getLogger(JdbcLockFactory.class); + private static final String INIT_LOCK_TABLES_PROPERTY = "maintenance.lock.jdbc.init-lock-tables"; + private static final String LOCK_TABLE_NAME = "maintenance_lock"; + private static final int MAX_PREFIX_LENGTH = 100; + private static final String CREATE_LOCK_TABLE_SQL = + "CREATE TABLE " + + LOCK_TABLE_NAME + + "(LOCK_TYPE CHAR(1) NOT NULL, ISSUER VARCHAR(" + + MAX_PREFIX_LENGTH + + ") NOT NULL, LOCK_ID CHAR(36) NOT NULL, PRIMARY KEY (LOCK_TYPE, ISSUER))"; + private static final String CREATE_LOCK_SQL = + "INSERT INTO " + LOCK_TABLE_NAME + " (LOCK_TYPE, ISSUER, LOCK_ID) VALUES (?, ?, ?)"; + private static final String GET_LOCK_SQL = + "SELECT LOCK_ID FROM " + LOCK_TABLE_NAME + " WHERE LOCK_TYPE=? AND ISSUER=?"; + private static final String DELETE_LOCK_SQL = + "DELETE FROM " + LOCK_TABLE_NAME + " WHERE LOCK_TYPE=? AND ISSUER=? AND LOCK_ID=?"; + + private final String uri; + private final String issuer; + private final Map<String, String> properties; + private transient JdbcClientPool pool; + + public JdbcLockFactory(String uri, String issuer, Map<String, String> properties) { + Preconditions.checkNotNull(uri, "JDBC connection URI is required"); + Preconditions.checkArgument( + issuer.length() < MAX_PREFIX_LENGTH, + "Invalid prefix length: issuer should be shorter than %s", + MAX_PREFIX_LENGTH); + this.uri = uri; + this.issuer = issuer; + this.properties = properties; + } + + @Override + public void open() { + this.pool = new JdbcClientPool(1, uri, properties); + + if (PropertyUtil.propertyAsBoolean(properties, INIT_LOCK_TABLES_PROPERTY, false)) { + initializeLockTables(); + } + } + + /** Only used in testing to share the jdbc pool */ + @VisibleForTesting + void open(JdbcLockFactory other) { + this.pool = other.pool; + } + + @Override + public Lock createLock() { + return new Lock(pool, issuer, Type.MAINTENANCE); + } + + @Override + public Lock createRecoveryLock() { + return new Lock(pool, issuer, Type.RECOVERY); + } + + @Override + public void close() throws IOException { + pool.close(); + } + + private void initializeLockTables() { + LOG.trace("Creating database tables (if missing) to store table maintenance locks"); + try { + pool.run( + conn -> { + DatabaseMetaData dbMeta = conn.getMetaData(); + ResultSet tableExists = + dbMeta.getTables( + null /* catalog name */, + null /* schemaPattern */, + LOCK_TABLE_NAME /* tableNamePattern */, + null /* types */); + if (tableExists.next()) { + return true; + } + + LOG.debug("Creating table {} to store iceberg catalog tables", LOCK_TABLE_NAME); + return conn.prepareStatement(CREATE_LOCK_TABLE_SQL).execute(); + }); + + } catch (SQLTimeoutException e) { + throw new UncheckedSQLException( + e, "Cannot initialize JDBC table maintenance lock: Query timed out"); + } catch (SQLTransientConnectionException | SQLNonTransientConnectionException e) { + throw new UncheckedSQLException( + e, "Cannot initialize JDBC table maintenance lock: Connection failed"); + } catch (SQLException e) { + throw new UncheckedSQLException(e, "Cannot initialize JDBC table maintenance lock"); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + throw new UncheckedInterruptedException(e, "Interrupted in call to initialize"); + } + } + + public static class Lock implements TriggerLockFactory.Lock { + private final JdbcClientPool pool; + private final String issuer; + private final Type type; + + public Lock(JdbcClientPool pool, String issuer, Type type) { + this.pool = pool; + this.issuer = issuer; + this.type = type; + } + + @Override + public boolean tryLock() { + if (isHeld()) { + LOG.info("Lock is already held"); + return false; + } + + try { + return pool.run( + conn -> { + try (PreparedStatement sql = conn.prepareStatement(CREATE_LOCK_SQL)) { + sql.setString(1, type.key); + sql.setString(2, issuer); + sql.setString(3, UUID.randomUUID().toString()); + return sql.executeUpdate() == 1; + } + }); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + throw new UncheckedInterruptedException(e, "Interrupted during tryLock"); + } catch (SQLException e) { + // SQL exception happened when creating the lock + throw new UncheckedSQLException(e, "Failed to create %s lock", type); + } + } + + @SuppressWarnings("checkstyle:NestedTryDepth") + @Override + public boolean isHeld() { + try { + return pool.run( + conn -> { + try (PreparedStatement sql = conn.prepareStatement(GET_LOCK_SQL)) { + sql.setString(1, type.key); + sql.setString(2, issuer); + try (ResultSet rs = sql.executeQuery()) { + return rs.next(); + } + } + }); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + throw new UncheckedInterruptedException(e, "Interrupted during isHeld"); + } catch (SQLException e) { + // SQL exception happened when getting lock information + throw new UncheckedSQLException(e, "Failed to get lock information for %s", type); + } + } + + @SuppressWarnings("checkstyle:NestedTryDepth") + @Override + public void unlock() { + try { + pool.run( + conn -> { + String lockId; + try (PreparedStatement sql = conn.prepareStatement(GET_LOCK_SQL)) { + sql.setString(1, type.key); + sql.setString(2, issuer); + try (ResultSet rs = sql.executeQuery()) { + if (rs.next()) { + lockId = rs.getString(1); + } else { + return null; + } + } + } + + try (PreparedStatement sql = conn.prepareStatement(DELETE_LOCK_SQL)) { + sql.setString(1, type.key); + sql.setString(2, issuer); + sql.setString(3, lockId); + sql.executeUpdate(); Review Comment: Done -- This is an automated message from the Apache Git Service. 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