sparkstreming遇到的bug,求大佬幫助!!

java.lang.Exception: Neither previous window has value for key, nor new values found. Are you sure your key class hashes consistently? 這個bug如何修復???有大佬知道嗎,萬分感謝,一個正常運行了4,5個月的spark streming程序,未改動過代碼,今天突然

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