Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/5031#discussion_r26811012
--- 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 --
hdfs (namenode) delegation tokens are renewed by the Yarn resourcemanager
for you, up til they expire at a week. (Then you need pr4688) Unfortunately
the resourcemanager it doesn't handle hive or hbase tokens. I personally think
putting in this code for hive and then possible hbase for us to know how to get
it is ok as long as the interfaces we are using are public and not likely to
change. However we should have a way to skip it if its not configured.
Yes, long running services should be able to renew or reacquire with what
Hari is doing.
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