{"record":{"id":"99edb35ad395854e","repo":"apache/seatunnel","slug":"error-getting-current-lsn-txid-e-getmessage","errorCode":null,"errorMessage":"Error getting current Lsn/txId ${e.getMessage()}","messagePattern":"Error getting current Lsn/txId (.+?)","errorType":"exception","errorClass":"SeaTunnelException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-postgres/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/postgres/utils/PostgresUtils.java","lineNumber":304,"sourceCode":"    public static LsnOffset getLsnPosition(Map<String, ?> offset) {\n        Map<String, String> offsetStrMap = new HashMap<>();\n        for (Map.Entry<String, ?> entry : offset.entrySet()) {\n            offsetStrMap.put(\n                    entry.getKey(), entry.getValue() == null ? null : entry.getValue().toString());\n        }\n        return new LsnOffset(offsetStrMap);\n    }\n\n    /** Fetch current largest log sequence number (LSN) of the database. */\n    public static LsnOffset currentLsn(PostgresConnection jdbcConnection) {\n        Long lsn;\n        Long txId;\n        try {\n            lsn = jdbcConnection.currentXLogLocation();\n            txId = jdbcConnection.currentTransactionId();\n            log.trace(\"Read xlogStart at '{}' from transaction '{}'\", Lsn.valueOf(lsn), txId);\n        } catch (SQLException e) {\n            throw new SeaTunnelException(\"Error getting current Lsn/txId \" + e.getMessage(), e);\n        }\n\n        try {\n            jdbcConnection.commit();\n        } catch (SQLException e) {\n            throw new SeaTunnelException(\"JDBC connection fails to commit: \" + e.getMessage(), e);\n        }\n\n        Map<String, String> offsetMap = new HashMap<>();\n        offsetMap.put(SourceInfo.LSN_KEY, lsn.toString());\n        if (txId != null) {\n            offsetMap.put(SourceInfo.TXID_KEY, txId.toString());\n        }\n        offsetMap.put(\n                SourceInfo.TIMESTAMP_USEC_KEY,\n                String.valueOf(Conversions.toEpochMicros(Instant.MIN)));\n        return LsnOffset.of(offsetMap);\n    }","sourceCodeStart":286,"sourceCodeEnd":322,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-postgres/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/postgres/utils/PostgresUtils.java#L286-L322","documentation":"PostgresUtils.currentLsn obtains the current WAL log sequence number and transaction id through Debezium's PostgresConnection (currentXLogLocation/currentTransactionId). Any SQLException while reading these is wrapped in SeaTunnelException 'Error getting current Lsn/txId <message>'; a subsequent commit failure produces the related 'JDBC connection fails to commit' error.","triggerScenarios":"The replication connection used to read the current LSN fails — connection dropped, the replication slot/replication privileges are missing, Postgres restarted, or the underlying query for pg_current_wal_lsn()/txid_current() errors.","commonSituations":"Server restart or failover during startup; user lacking REPLICATION privilege; wal_level not set to logical; network/firewall dropping long-lived connections; slot conflicts after promotion.","solutions":["Read e.getMessage() in the error for the root SQL failure (usually connection or privilege)","Confirm wal_level=logical and the CDC user has REPLICATION privilege (pg_roles rolreplication)","Test the replication connection and slot: pg_replication_slots should show your slot active/available","Check connection stability (keepalives, firewall timeouts) and restart the job — LSN read is retried on next startup"],"exampleFix":"-- on the server\nALTER ROLE cdc_user WITH REPLICATION;\nALTER SYSTEM SET wal_level = 'logical';","handlingStrategy":"try-catch","validationCode":"SHOW wal_level;                       -- must be 'logical'\nSELECT rolreplication FROM pg_roles WHERE rolname = 'cdc_user'; -- must be true","typeGuard":null,"tryCatchPattern":"try { Lsn lsn = PostgresUtils.currentLsn(conn); } catch (SeaTunnelException e) {\n    log.error(\"LSN read failed: {} cause={}\", e.getMessage(), e.getCause()); throw e;\n}","preventionTips":["Set wal_level=logical and grant REPLICATION to the CDC user","Create and monitor the replication slot before starting","Enable TCP keepalives; expect restarts after failover and rely on job restart to re-read LSN"],"tags":["postgres","cdc","replication","lsn","wal"],"backgroundTag":"connection-refused","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}