Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9026#discussion_r42183714
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -1272,11 +1272,24 @@ object Client extends Logging {
val mirror = universe.runtimeMirror(getClass.getClassLoader)
try {
- val hiveClass =
mirror.classLoader.loadClass("org.apache.hadoop.hive.ql.metadata.Hive")
- val hive = hiveClass.getMethod("get").invoke(null)
-
- val hiveConf = hiveClass.getMethod("getConf").invoke(hive)
val hiveConfClass =
mirror.classLoader.loadClass("org.apache.hadoop.hive.conf.HiveConf")
+ val hiveConf = hiveConfClass.newInstance()
+
+ // Set metastore to be a local temp directory to avoid conflict of
the `metaStore client`
+ // in `HiveContext` which will use the same derby dataBase by
default.
+ val hiveConfSet = (param: String, value: String) => hiveConfClass
+ .getMethod("set", classOf[Unit])
+ .invoke(hiveConf, param, value)
+ val tempDir = Utils.createTempDir()
+ val localMetastore = new File(tempDir, "metastore")
+ hiveConfSet("hive.metastore.warehouse.dir",
localMetastore.toURI.toString)
+ hiveConfSet("javax.jdo.option.ConnectionURL",
+
s"jdbc:derby:;databaseName=${localMetastore.getAbsolutePath};create=true")
+ hiveConfSet("datanucleus.rdbms.datastoreAdapterClassName",
+ "org.datanucleus.store.rdbms.adapter.DerbyAdapter")
+
+ val hiveClass =
mirror.classLoader.loadClass("org.apache.hadoop.hive.ql.metadata.Hive")
+ val hive = hiveClass.getMethod("get").invoke(null,
hiveConf.asInstanceOf[Object])
--- End diff --
So, the original problem is caused by this line, right?
Since the `hive` object is only used inside the condition on L1301, can't
you move the original line inside that `if` and fix the problem? You don't need
delegation tokens when using Derby (and `hive.metastore.uris` would be empty in
that case), so there's no point in even trying to call this class if Derby is
being used.
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