canal正常启动，但是无法读取 bin log 日志，meta.data 文件的原因

本文链接：https://blog.youkuaiyun.com/weixin_43038063/article/details/100888973

本文详细解析了Canal服务出现故障的原因，当meta.dat文件指向的MySQL二进制日志不存在时，会导致Canal无法正常工作。文章提供了具体的错误日志分析，并给出了解决方案：删除meta.dat文件后重启Canal服务，以确保日志文件的正确读取。

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canal 不知道因为什么原因挂掉了，重启的话，adapter 端日志也显示启动正常，找了半天是因为 canalserver 端的配置出现问题，conf 目录下的 meta.dat 文件读取的文件不存在，错误日志是这样的：

2019-09-15 23:59:21.853 [destination = testcore , address = /172.18.108.67:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> begin to find start position, it will be long time for reset or first position
2019-09-15 23:59:21.854 [destination = testcore , address = /172.18.108.67:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - prepare to find start position just last position
 {"identity":{"slaveId":-1,"sourceAddress":{"address":"172.18.108.67","port":3306}},"postion":	{"gtid":"","included":false,"journalName":"mysql-bin.000030","position":832575421,"serverId":10867,"timestamp":1567176390000}}
2019-09-15 23:59:21.855 [destination = testcore , address = /172.18.108.67:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> find start position successfully, EntryPosition[included=false,journalName=mysql-bin.000030,position=832575421,serverId=10867,gtid=,timestamp=1567176390000] cost : 2ms , the next step is binlog dump
2019-09-15 23:59:21.857 [destination = testcore , address = /172.18.108.67:3306 , 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-1.1.3.jar:na]
    at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:235) [canal.parse-1.1.3.jar:na]
    at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:257) [canal.parse-1.1.3.jar:na]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
2019-09-15 23:59:21.857 [destination = testcore , address = /172.18.108.67:3306 , EventParser] ERROR 	c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - dump address /172.18.108.67:3306 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-1.1.3.jar:na]
    at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:235) ~[canal.parse-1.1.3.jar:na]
    at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:257) ~[canal.parse-1.1.3.jar:na]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
2019-09-15 23:59:21.857 [destination = testcore , address = /172.18.108.67:3306 , EventParser] ERROR com.alibaba.otter.canal.common.alarm.LogAlarmHandler - destination:testcore[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:257)
    at java.lang.Thread.run(Thread.java:745)

]

需要把 meta.dat 文件删除，然后重启 canalserver ，重新匹配日志文件读取才正常。