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c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> find start position successfully, EntryPosition[included=false,journalName=binlog.003736,position=1013761843,serverId=1,gtid=,timestamp=1696243480000] cost : 147ms , the next step is binlog dump
2023-10-12 14:39:43.296 [destination = ljykt-travel-agency-instance , address = /183.56.198.172:3306 , EventParser] ERROR c.a.o.canal.parse.inbound.mysql.dbsync.DirectLogFetcher - I/O error while reading from client socket
java.io.IOException: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at com.alibaba.otter.canal.parse.inbound.mysql.dbsync.DirectLogFetcher.fetch(DirectLogFetcher.java:102) ~[canal.parse-1.1.6.jar:na]
	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:237) [canal.parse-1.1.6.jar:na]
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$1.run(AbstractEventParser.java:262) [canal.parse-1.1.6.jar:na]
	at java.lang.Thread.run(Unknown Source) [na:1.8.0_351]
2023-10-12 14:39:43.296 [destination = ljykt-travel-agency-instance , address = /183.56.198.172:3306 , EventParser] ERROR c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - dump address /183.56.198.172:3306 has an error, retrying. caused by 
java.io.IOException: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at com.alibaba.otter.canal.parse.inbound.mysql.dbsync.DirectLogFetcher.fetch(DirectLogFetcher.java:102) ~[canal.parse-1.1.6.jar:na]
	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:237) ~[canal.parse-1.1.6.jar:na]
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$1.run(AbstractEventParser.java:262) ~[canal.parse-1.1.6.jar:na]
	at java.lang.Thread.run(Unknown Source) [na:1.8.0_351]
2023-10-12 14:39:43.297 [destination = ljykt-travel-agency-instance , address = /183.56.198.172:3306 , EventParser] ERROR com.alibaba.otter.canal.common.alarm.LogAlarmHandler - destination:ljykt-travel-agency-instance[java.io.IOException: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at com.alibaba.otter.canal.parse.inbound.mysql.dbsync.DirectLogFetcher.fetch(DirectLogFetcher.java:102)
	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:237)
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$1.run(AbstractEventParser.java:262)
	at java.lang.Thread.run(Unknown Source)

原因是：

情况一、当你第一次监听的mysql和第二次监听的mysql不一样的时候，就有可能报出这个PositionNotFoundException。
情况二、mysql的binlog被删除，也有可能会报出PositionNotFoundException。
问题如下：
canal监听mysql的时候会在conf/{destination}/meta.dat文件中记录当前binlog的名字、position。

下次启动canal的时候就从这个binlog的position开始读取数据。

meta.dat记录的是上一次的binlog信息，当你删除mysql的binlog或者监听到另外一台mysql后，meta.dat记录的信息就相当于过期信息，所以就会出现PositionNotFoundException。

https://www.jianshu.com/p/e33a918aad09

解决方法:
1，删除meta.dat文件
2，重启canal：sh ${CANAL_HOME}/bin/restart.sh