canal instance 报错: Received error packet

时间:2025-02-09 18:59:23

问题

某次启动canal之后,instance始终不能处理binlog,查看日志发现如下报错

2021-01-11 23:32:06.987 [destination = jdp , address = /127.0.0.1:3306 , EventParser] ERROR  - I/O error while reading from client socket
: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at (:102) ~[-1.1.:na]
	at (:235) [-1.1.:na]
	at $3.run(:265) [-1.1.:na]
	at (:748) [na:1.8.0_252]
2021-01-11 23:32:06.988 [destination = jdp , address = /127.0.0.1:3306 , EventParser] ERROR  - dump address /127.0.0.1:3306 has an error, retrying. caused by 
: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at (:102) ~[-1.1.:na]
	at (:235) ~[-1.1.:na]
	at $3.run(:265) ~[-1.1.:na]
	at (:748) [na:1.8.0_252]
2021-01-11 23:32:06.988 [destination = jdp , address = /127.0.0.1:3306 , EventParser] ERROR  - destination:jdp[: Received error packet: errno = 1236, sqlstate = HY000 errmsg = Could not find first log file name in binary log index file
	at (:102)
	at (:235)
	at $3.run(:265)
	at (:748)
]

分析原因

从日志中Could not find first log file name in binary log index file可以看出是起始位点错了,重新制定起始的位点就可以了。我这里是因为我长时间没有运行,binlog的日志文件被删除了,导致找不到起始位置

解决

我是去了canal安装目录下的配置文件目录中,找到对应的instance名字,进入配置中删除掉meta文件。这个文件打开看下可以发现里面记录了上一次binlog的位置信息,我直接把他删了的话canal再次启动会读取最新的,如果想指定位置也可以直接配置

有的小伙伴说他删了meta文件,但是依然有报错,我这里总结一下我遇到这种现象的时的情况:

  1. 删除meta文件的时候,canal还在运行,当canal关闭的时候会再次生成。对于这种情况要先停掉服务,然后再删除文件;
  2. 在canal admin的instance对应配置中配置了binlog的position信息,那么在没有meta文件的情况下他会使用canal admin中配置的信息。这种情况下吧canal admin中的配置去掉或者设置成自己想要的位置信息就可以了;