sparkstreming遇到的bug,求大佬帮助!!

java.lang.Exception: Neither previous window has value for key, nor new values found. Are you sure your key class hashes consistently? 这个bug如何修复???有大佬知道吗,万分感谢,一个正常运行了4,5个月的spark streming程序,未改动过代码,今天突然

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