dyp12 commented on code in PR #9628:
URL: https://github.com/apache/seatunnel/pull/9628#discussion_r2240081111
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seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/utils/MySqlConnectionUtils.java:
##########
@@ -185,4 +192,87 @@ private static Map<String, String> querySystemVariables(
return variables;
}
+
+ public static BinlogOffset findBinlogOffsetBytimestamp(
+ JdbcConnection jdbc, BinaryLogClient client, long timestamp) {
+ final String showBinaryLogStmt = "SHOW BINARY LOGS";
+ List<String> binlogFiles = new ArrayList<>();
+ JdbcConnection.ResultSetConsumer rsc =
+ rs -> {
+ while (rs.next()) {
+ String fileName = rs.getString(1);
+ long fileSize = rs.getLong(2);
+ if (fileSize > 0) {
+ binlogFiles.add(fileName);
+ }
+ }
+ };
+ try {
+ jdbc.query(showBinaryLogStmt, rsc);
+ if (binlogFiles.isEmpty()) {
+ return BinlogOffset.INITIAL_OFFSET;
+ }
+ String binlogName = searchBinlogName(client, timestamp,
binlogFiles);
+ return new BinlogOffset(binlogName, 0);
Review Comment:
> So, our logic cannot precisely specify the binlog offset, and can only
locate the file closest to the specified timestamp? This might result in data
before the timestamp being read, or data after the timestamp being discarded.
Is my understanding correct?
yes，in mysql , we cannot to find the specified timestamp quickly，i search
other cdc tools, eg flink cdc , it also use binlog file begin
<img width="904" height="724" alt="1753799815409"
src="https://github.com/user-attachments/assets/8c67cd4c-3abd-476e-9ea9-4826f34da66c";
/>
https://github.com/apache/flink-cdc/blob/master/flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/main/java/org/apache/flink/cdc/connectors/mysql/debezium/DebeziumUtils.java#L245
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