Github user tgravescs commented on a diff in the pull request: https://github.com/apache/spark/pull/9257#discussion_r42997294 --- Diff: core/src/main/scala/org/apache/spark/SecurityManager.scala --- @@ -365,33 +366,37 @@ private[spark] class SecurityManager(sparkConf: SparkConf) * we throw an exception. */ private def generateSecretKey(): String = { - if (!isAuthenticationEnabled) return null - // first check to see if the secret is already set, else generate a new one if on yarn - val sCookie = if (SparkHadoopUtil.get.isYarnMode) { - val secretKey = SparkHadoopUtil.get.getSecretKeyFromUserCredentials(sparkSecretLookupKey) - if (secretKey != null) { - logDebug("in yarn mode, getting secret from credentials") - return new Text(secretKey).toString + if (!isAuthenticationEnabled) { + null + } else if (SparkHadoopUtil.get.isYarnMode) { + // In YARN mode, the secure cookie will be created by the driver and stashed in the + // user's credentials, where executors can get it. The check for an array of size 0 + // is because of the test code in YarnSparkHadoopUtilSuite. + val secretKey = SparkHadoopUtil.get.getSecretKeyFromUserCredentials(SECRET_LOOKUP_KEY) + if (secretKey == null || secretKey.length == 0) { + val rnd = new SecureRandom() + val length = sparkConf.getInt("spark.authenticate.secretBitLength", 256) / 8 + val secret = new Array[Byte](length) + rnd.nextBytes(secret) + + val cookie = HashCodes.fromBytes(secret).toString() + SparkHadoopUtil.get.addSecretKeyToUserCredentials(SECRET_LOOKUP_KEY, cookie) + cookie } else { - logDebug("getSecretKey: yarn mode, secret key from credentials is null") --- End diff -- any reason not to leave the debug messages?
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