Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25525993
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
@@ -82,6 +93,102 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil {
if (credentials != null) credentials.getSecretKey(new Text(key)) else
null
}
+ override def setPrincipalAndKeytabForLogin(principal: String, keytab:
String): Unit = {
+ loginPrincipal = Option(principal)
+ keytabFile = Option(keytab)
+ }
+
+ private[spark] override def scheduleLoginFromKeytab(
+ callback: (SerializableBuffer) => Unit): Unit = {
+
+ loginPrincipal match {
+ case Some(principal) =>
+ val keytab = keytabFile.get
+ val remoteFs = FileSystem.get(conf)
+ val remoteKeytabPath = new Path(
+ remoteFs.getHomeDirectory, System.getenv("SPARK_STAGING_DIR") +
Path.SEPARATOR + keytab)
+ val localFS = FileSystem.getLocal(conf)
+ // At this point, SparkEnv is likely no initialized, so create a
dir, put the keytab there.
+ val tempDir = Utils.createTempDir()
+ val localURI = new URI(tempDir.getAbsolutePath + Path.SEPARATOR +
keytab)
+ val qualifiedURI = new URI(localFS.makeQualified(new
Path(localURI)).toString)
+ FileUtil.copy(
+ remoteFs, remoteKeytabPath, localFS, new Path(qualifiedURI),
false, false, conf)
+ // Get the current credentials, find out when they expire.
+ val creds = UserGroupInformation.getCurrentUser.getCredentials
+ val credStream = new ByteArrayOutputStream()
+ creds.writeTokenStorageToStream(new DataOutputStream(credStream))
+ val in = new DataInputStream(new
ByteArrayInputStream(credStream.toByteArray))
+ val tokenIdentifier = new DelegationTokenIdentifier()
+ tokenIdentifier.readFields(in)
+ val timeToRenewal = (0.6 * (tokenIdentifier.getMaxDate -
System.currentTimeMillis())).toLong
+ Executors.newSingleThreadScheduledExecutor(new ThreadFactory {
+ override def newThread(r: Runnable): Thread = {
+ val t = new Thread(r)
+ t.setName("Delegation Token Refresh Thread")
+ t.setDaemon(true)
+ t
+ }
+ }).scheduleWithFixedDelay(new Runnable {
+ override def run(): Unit = {
+ if (!loggedInViaKeytab.get()) {
--- End diff --
It may not be the same thread but it's always single-threaded, right?
Otherwise the `SingleThreadedExecutor` implementation has a problem...
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