{"record":{"id":"f8ea19dbdd2a3654","repo":"apache/seatunnel","slug":"read-the-binlog-offset-error-f8ea19","errorCode":null,"errorMessage":"Read the binlog offset error","messagePattern":"Read the binlog offset error","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/offset/BinlogOffsetFactory.java","lineNumber":49,"sourceCode":"/** An offset factory class create {@link BinlogOffset} instance. */\npublic class BinlogOffsetFactory extends OffsetFactory {\n\n    private final MySqlSourceConfig sourceConfig;\n\n    private final JdbcDataSourceDialect dialect;\n\n    public BinlogOffsetFactory(\n            MySqlSourceConfigFactory configFactory, JdbcDataSourceDialect dialect) {\n        this.sourceConfig = configFactory.create(0);\n        this.dialect = dialect;\n    }\n\n    @Override\n    public Offset earliest() {\n        try (JdbcConnection jdbcConnection = dialect.openJdbcConnection(sourceConfig)) {\n            return MySqlConnectionUtils.earliestBinlogOffset(jdbcConnection);\n        } catch (Exception e) {\n            throw new RuntimeException(\"Read the binlog offset error\", e);\n        }\n    }\n\n    @Override\n    public Offset neverStop() {\n        return BinlogOffset.NO_STOPPING_OFFSET;\n    }\n\n    @Override\n    public Offset latest() {\n        try (JdbcConnection jdbcConnection = dialect.openJdbcConnection(sourceConfig)) {\n            return MySqlConnectionUtils.currentBinlogOffset(jdbcConnection);\n        } catch (Exception e) {\n            throw new RuntimeException(\"Read the binlog offset error\", e);\n        }\n    }\n\n    @Override","sourceCodeStart":31,"sourceCodeEnd":67,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/offset/BinlogOffsetFactory.java#L31-L67","documentation":"BinlogOffsetFactory.earliest() opens a JDBC connection to MySQL via the dialect to read the earliest available binlog offset (MySqlConnectionUtils.earliestBinlogOffset). Any failure opening the connection or querying binlog coordinates is rethrown as a RuntimeException('Read the binlog offset error').","triggerScenarios":"startup.mode='earliest' triggering BinlogOffsetFactory.earliest(); underlying cause typically SQLException/SQLTimeout from openJdbcConnection or the binlog coordinate query.","commonSituations":"Wrong hostname/port or credentials in the source config; MySQL user lacking REPLICATION CLIENT/SLAVE privileges; network/firewall blocking 3306; server binlogs purged so earliest coordinates can't be computed; MySQL down.","solutions":["Check the root cause ('Caused by') for connection vs. SQL errors and fix connectivity or credentials first","Grant the CDC user REPLICATION CLIENT (and REPLICATION SLAVE) privileges and verify with a manual mysql client connection","Confirm hostname/port/SSL settings and that MySQL is reachable from the SeaTunnel node","Retry if the failure was a transient network blip — job submission can be re-run"],"exampleFix":"// before\nurl = \"jdbc:mysql://localhost:3306\"\n// after (correct host, and a user with REPLICATION privileges)\nurl = \"jdbc:mysql://mysql-prod:3306\"\nusername = \"sea_cdc\"\npassword = \"***\"","handlingStrategy":"retry","validationCode":"// before submitting, verify connectivity and privileges\ntry (Connection c = DriverManager.getConnection(url, user, pass)) {\n    try (Statement s = c.createStatement(); ResultSet r = s.executeQuery(\"SHOW MASTER STATUS\")) {\n        if (!r.next()) throw new IllegalStateException(\"CDC user cannot read binlog status\");\n    }\n}","typeGuard":null,"tryCatchPattern":"try {\n    offsetFactory.earliest();\n} catch (RuntimeException e) {\n    LOG.error(\"Failed to read binlog offset (check JDBC config/privileges): {}\", e.getCause(), e);\n    throw e;\n}","preventionTips":["Verify JDBC connectivity with a mysql client from the SeaTunnel host","Grant REPLICATION CLIENT/SLAVE to the CDC user","Include retries with backoff around job submission for transient DB issues","Check 'Caused by' first — the wrapper message hides the real cause"],"tags":["jdbc","mysql","connection","binlog"],"backgroundTag":"database-query-failed","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}