Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5031#discussion_r26796950
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -903,6 +908,30 @@ object Client extends Logging {
}
/**
+ * Obtains token for the Hive metastore and adds them to the credentials.
+ */
+ private def obtainTokenForHiveMetastore(conf: Configuration,
credentials: Credentials) {
+ if (UserGroupInformation.isSecurityEnabled /* And Hive is enabled */) {
+ val hc = org.apache.hadoop.hive.ql.metadata.Hive.get
+ val principal =
hc.getConf().get(HiveConf.ConfVars.METASTORE_KERBEROS_PRINCIPAL.varname)
+ val username = UserGroupInformation.getCurrentUser().getUserName
+
+ if (principal == null) {
+ val errorMessage = "Required hive metastore principal is not
configured!"
+ logError(errorMessage)
+ throw new IllegalArgumentException(errorMessage)
+ }
+
+ val tokenStr = hc.getDelegationToken(username,principal)
+ val hive2Token = new Token[DelegationTokenIdentifier]()
+ hive2Token.decodeFromUrlString(tokenStr)
+ credentials.addToken(new Text("hive.server2.delegation.token"),
hive2Token)
+ logDebug("Added the Hive Server 2 token to conf.")
+ org.apache.hadoop.hive.ql.metadata.Hive.closeCurrent
--- End diff --
Hbase needs its own delegation token, so I guess it wouldn't work either
without some code to fetch the token.
Regarding token expiry, especially for a long running process (let's say
the thrift server), it would require something similar to what Hari is doing in
#4688 .
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