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DIGEST-MD5 Error Message

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DIGEST-MD5 Error Message

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I got this below error message in the logs on 2 datanodes. Hard restart fixed this problem but I wanted to what prompted that error.

If someone can through a light on it will greatly appreciate.

 

DataXceiver error processing unknown operation  src: /10.13.162.216:56080 dst: /10.13.161.101:1204
javax.security.sasl.SaslException: DIGEST-MD5: IO error acquiring password [Caused by org.apache.hadoop.hdfs.protocol.datatransfer.InvalidEncryptionKeyException: Can't re-compute encryption key for nonce, since the required block key (keyID=1900417437) doesn't exist.