cassandra节点启动报错：java.io.UTFDataFormatException，

cassandra节点启动报错：java.io.UTFDataFormatException，

INFO  01:30:44 Harmless error reading saved cache /hdd1/cassandra/saved_caches/KeyCache-e.db
java.io.UTFDataFormatException: malformed input around byte 32
at java.io.DataInputStream.readUTF(DataInputStream.java:656) ~[na:1.8.0_111]
at java.io.DataInputStream.readUTF(DataInputStream.java:564) ~[na:1.8.0_111]
at org.apache.cassandra.cache.AutoSavingCache.loadSaved(AutoSavingCache.java:214) ~[apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:164) [apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:160) [apache-cassandra-3.9.jar:3.9]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]

INFO  01:30:44 Completed loading (59 ms; 1474 keys) KeyCache cache

还不知道什么原因啊