Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/4688#discussion_r25978621 --- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala --- @@ -82,6 +100,179 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil { if (credentials != null) credentials.getSecretKey(new Text(key)) else null } + private[spark] override def scheduleLoginFromKeytab(): Unit = { + sparkConf.getOption("spark.yarn.principal").foreach { principal => + val keytab = sparkConf.get("spark.yarn.keytab") + val delegationTokenRenewerRunnable = + new Runnable { + override def run(): Unit = { + renewCredentials(principal, keytab) + delegationTokenRenewer.schedule( + this, (0.75 * (getLatestValidity - System.currentTimeMillis())).toLong, + TimeUnit.MILLISECONDS) + } + } + val timeToRenewal = (0.75 * (getLatestValidity - System.currentTimeMillis())).toLong + delegationTokenRenewer.schedule( + delegationTokenRenewerRunnable, timeToRenewal, TimeUnit.MILLISECONDS) + } + } + + private def renewCredentials(principal: String, keytab: String): Unit = { + if (!loggedInViaKeytab) { + // Keytab is copied by YARN to the working directory of the AM, so full path is + // not needed. + loggedInUGI = UserGroupInformation.loginUserFromKeytabAndReturnUGI( + principal, keytab) + loggedInViaKeytab = true + } + val nns = getNameNodesToAccess(sparkConf) + val newCredentials = loggedInUGI.getCredentials + obtainTokensForNamenodes(nns, conf, newCredentials) + val remoteFs = FileSystem.get(conf) + val nextSuffix = lastCredentialsFileSuffix + 1 + val tokenPathStr = + sparkConf.get("spark.yarn.credentials.file") + "-" + nextSuffix + val tokenPath = new Path(tokenPathStr) + val tempTokenPath = new Path(tokenPathStr + ".tmp") + val stream = Option(remoteFs.create(tempTokenPath, true)) + try { + stream.foreach { s => + newCredentials.writeTokenStorageToStream(s) + s.hflush() + s.close() + remoteFs.rename(tempTokenPath, tokenPath) + } + } catch { + case e: Exception => --- End diff -- Do you really want to ignore the exception? If so, add a comment explaining why, and at least log it so the info is not lost.
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