Canal错误处理记录

Canal启动后 错误信息如下：

2021-10-08 06:28:01.142 [destination = example , address = /x.x.x.x: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-1.1.5-SNAPSHOT.jar:na]
	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:235) [canal.parse-1.1.5-SNAPSHOT.jar:na]
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:265) [canal.parse-1.1.5-SNAPSHOT.jar:na]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
2021-10-08 06:28:01.142 [destination = example , address = /x.x.x.x:3306 , EventParser] ERROR c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - dump address /x.x.x.x: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-1.1.5-SNAPSHOT.jar:na]
	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:235) ~[canal.parse-1.1.5-SNAPSHOT.jar:na]
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:265) ~[canal.parse-1.1.5-SNAPSHOT.jar:na]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
2021-10-08 06:28:01.146 [destination = example , address = /x.x.x.x:3306 , EventParser] ERROR com.alibaba.otter.canal.common.alarm.LogAlarmHandler - destination:example[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:235)
	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:265)
	at java.lang.Thread.run(Thread.java:748)
]

原因：mysql重启后bin日志文件会重新生成，canal的canal/conf/example目录下会有一个meta.dat的文件，记录上回读取的bin日志文件，如果旧的bin日志文件被删除，则canal会找不到该bin日志文件而无法开始同步。

解决方案：删除该meta.dat文件再重启canal服务即可