解决Zookeeper集群启动报错Caused by: java.lang.IllegalArgumentException: ...myid file is missing，有myid却还报错问题

出现问题

今天在采用单机伪分布式的方式搭建了Zookeeper集群后，启动时发现控制台报启动成功，但是查看zookeeper进程时却发现并没有正在运行的zookeeper进程

于是，采用前台启动的方式（./zkServer.sh start-foreground）再次启动，发现启动报错

ZooKeeper JMX enabled by default
Using config: /opt/myzookeeper/zk01/bin/../conf/zoo.cfg
2019-10-29 08:48:47,851 [myid:] - INFO  [main:QuorumPeerConfig@136] - Reading configuration from: /opt/myzookeeper/zk01/bin/../conf/zoo.cfg
2019-10-29 08:48:47,865 [myid:] - INFO  [main:QuorumPeer$QuorumServer@184] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2019-10-29 08:48:47,865 [myid:] - INFO  [main:QuorumPeer$QuorumServer@184] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2019-10-29 08:48:47,866 [myid:] - INFO  [main:QuorumPeer$QuorumServer@184] - Resolved hostname: 127.0.0.1 to address: /127.0.0.1
2019-10-29 08:48:47,866 [myid:] - INFO  [main:QuorumPeerConfig@398] - Defaulting to majority quorums
2019-10-29 08:48:47,868 [myid:] - ERROR [main:QuorumPeerMain@88] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /opt/myzookeeper/zk01/bin/../conf/zoo.cfg
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:156)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:104)
	at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
Caused by: java.lang.IllegalArgumentException: /myzookeeper/zk01/mydata/myid file is missing
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:408)
	at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:152)
	... 2 more

从Caused by来看，上面说我的zk01/mydata/myid文件不存在，file is missing。于是我就进入到相应目录查看我的myid文件，发现分明有啊！且其中的内容也是1，没有空格等其他的多余字符。为何扔报错？

问题解决：

仔细查看报错信息会发现提示错误审查：/opt/myzookeeper/zk01/bin/…/conf/zoo.cfg
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /opt/myzookeeper/zk01/bin/…/conf/zoo.cfg
据此推测应该是自己的配置文件zoo.cfg修改有误，于是来到zoo.cfg进行检查

果然，由于我配置的三台zookeeper，zk01、zk02、zk03均在/opt/myzookeeper下，因此当配置自己的数据和log路径时应将路径写全

补全zoo.cfg中的数据和log路径后再次逐个启动集群发现问题解决，集群全部启动成功

总结：

出现myid file is missing的报错时，可能跟你conf下的zoo.cfg中dataDir与dataLogDir的路径配置不正确的问题，在写这两行配置时一定要查看你的zookeeper集群目录，将路径补全。