Created
August 28, 2017 18:05
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random example of exploring spark internals w/ reflection while debugging cluster config
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| // paste in | |
| // https://gist.githubusercontent.com/squito/329d9cd82a21f645d592/raw/ca9217708293d6fe69ed6638f4feeb3038f8fd9c/reflector.scala | |
| val xCat = spark.sessionState.catalog.externalCatalog | |
| val catClient = get(xCat, "client") | |
| catClient.reflectMethod("getConf", Seq("hive.metastore.uris", "")) | |
| import org.apache.hadoop.fs.{FileSystem, Path} | |
| val fs = FileSystem.get(sc.hadoopConfiguration) | |
| val defaultDb = catClient.reflectMethod("getDatabase", Seq("default")) | |
| val dbLoc = defaultDb.reflectField("locationUri").asInstanceOf[java.net.URI] | |
| val qDbLoc = xCat.reflectMethod("org$apache$spark$sql$hive$HiveExternalCatalog$$makeQualified", Seq(dbLoc)).asInstanceOf[java.net.URI] | |
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