问题描述

dubbo Can not lock the registry cache file

使用dubbo 出现以下异常 要怎么处理诶；
2016-01-22 09:27:06 WARN [com.alibaba.dubbo.registry.support.AbstractRegistry.doSaveProperties(AbstractRegistry.java:221)] - < [DUBBO] Failed to save registry store file, cause: Can not lock the registry cache file C:UsersAdministrator.dubbodubbo-registry-127.0.0.1.cache, ignore and retry later, maybe multi java process use the file, please config: dubbo.registry.file=xxx.properties, dubbo version: 2.5.3, current host: 127.0.0.1>
java.io.IOException: Can not lock the registry cache file C:UsersAdministrator.dubbodubbo-registry-127.0.0.1.cache, ignore and retry later, maybe multi java process use the file, please config: dubbo.registry.file=xxx.properties
at com.alibaba.dubbo.registry.support.AbstractRegistry.doSaveProperties(AbstractRegistry.java:193)
at com.alibaba.dubbo.registry.support.AbstractRegistry$SaveProperties.run(AbstractRegistry.java:150)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
2016-01-22 09:27:06 WARN [com.alibaba.dubbo.registry.support.AbstractRegistry.doSaveProperties(AbstractRegistry.java:221)] - < [DUBBO] Failed to save registry store file, cause: Can not lock the registry cache file C:UsersAdministrator.dubbodubbo-registry-127.0.0.1.cache, ignore and retry later, maybe multi java process use the file, please config: dubbo.registry.file=xxx.properties, dubbo version: 2.5.3, current host: 127.0.0.1>
java.io.IOException: Can not lock the registry cache file C:UsersAdministrator.dubbodubbo-registry-127.0.0.1.cache, ignore and retry later, maybe multi java process use the file, please config: dubbo.registry.file=xxx.properties
at com.alibaba.dubbo.registry.support.AbstractRegistry.doSaveProperties(AbstractRegistry.java:193)
at com.alibaba.dubbo.registry.support.AbstractRegistry$SaveProperties.run(AbstractRegistry.java:150)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

解决方案

当本地同时启动服务端和客户端的时候就可能产生这个问题。
解决方案

Dubbo通过注册中心发现服务，发现的服务Dubbo同时也会保存到本地缓存一份，缓存的好处有很多，比如不需要每次使用的时候都通过注册中心获取，注册中心不可用了，不影响消费端的调用，因为本地缓存了一份服务提供者列表。Dubbo本地缓存默认采用的文件，会根据注册中心自动在当前用户目录下生成一个缓存文件，类似/home/newad/.dubbo/dubbo-registry-*.*.*.*.cache，星号表示注册中心的IP地址，当同一台机器上同时启动多个进程，就会出现多个进程争夺此文件的写入权限，觖此问题的方法也很简单，日志里面都说了重新配置一下这个缓存文件就。

主要在启动脚本里面添加配置： -Ddubbo.registry.file=C:Usersdell.dubbodubbo-registry-192.168.1.62-junit.cache 文件名自己配置一个 -Ddubbo.registry.file=C:Usersdell.dubbodubbo-registry-192.168.1.62-junit.cache

解决方案二：

Dubbo java.io.IOException: Can not lock the registry cache file