Hi All,
Could someone shed a light to why when adding element into MutableList can
result in type mistmatch, even if I'm sure that the class type is right?
Below is the sample code I run in spark 1.0.2 console, at the end of line,
there is an error type mismatch:
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 1.0.2
/_/
Using Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_45)
Type in expressions to have them evaluated.
Type :help for more information.
14/10/15 14:36:39 INFO spark.SecurityManager: Changing view acls to: hadoop
14/10/15 14:36:39 INFO spark.SecurityManager: SecurityManager: authentication
disabled; ui acls disabled; users with view permissions: Set(hadoop)
14/10/15 14:36:39 INFO slf4j.Slf4jLogger: Slf4jLogger started
14/10/15 14:36:39 INFO Remoting: Starting remoting
14/10/15 14:36:39 INFO Remoting: Remoting started; listening on addresses
:[akka.tcp://sp...@fphd4.ctpilot1.com:35293]
14/10/15 14:36:39 INFO Remoting: Remoting now listens on addresses:
[akka.tcp://sp...@fphd4.ctpilot1.com:35293]
14/10/15 14:36:39 INFO spark.SparkEnv: Registering MapOutputTracker
14/10/15 14:36:39 INFO spark.SparkEnv: Registering BlockManagerMaster
14/10/15 14:36:39 INFO storage.DiskBlockManager: Created local directory at
/tmp/spark-local-20141015143639-c62e
14/10/15 14:36:39 INFO storage.MemoryStore: MemoryStore started with capacity
294.4 MB.
14/10/15 14:36:39 INFO network.ConnectionManager: Bound socket to port 43236
with id = ConnectionManagerId(fphd4.ctpilot1.com,43236)
14/10/15 14:36:39 INFO storage.BlockManagerMaster: Trying to register
BlockManager
14/10/15 14:36:39 INFO storage.BlockManagerInfo: Registering block manager
fphd4.ctpilot1.com:43236 with 294.4 MB RAM
14/10/15 14:36:39 INFO storage.BlockManagerMaster: Registered BlockManager
14/10/15 14:36:39 INFO spark.HttpServer: Starting HTTP Server
14/10/15 14:36:39 INFO server.Server: jetty-8.y.z-SNAPSHOT
14/10/15 14:36:40 INFO server.AbstractConnector: Started
SocketConnector@0.0.0.0:37164
14/10/15 14:36:40 INFO broadcast.HttpBroadcast: Broadcast server started at
http://10.18.30.154:37164
14/10/15 14:36:40 INFO spark.HttpFileServer: HTTP File server directory is
/tmp/spark-34fc70ab-7c5d-4e79-9ae7-929fd47d4f36
14/10/15 14:36:40 INFO spark.HttpServer: Starting HTTP Server
14/10/15 14:36:40 INFO server.Server: jetty-8.y.z-SNAPSHOT
14/10/15 14:36:40 INFO server.AbstractConnector: Started
SocketConnector@0.0.0.0:47025
14/10/15 14:36:40 INFO server.Server: jetty-8.y.z-SNAPSHOT
14/10/15 14:36:40 INFO server.AbstractConnector: Started
SelectChannelConnector@0.0.0.0:4040
14/10/15 14:36:40 INFO ui.SparkUI: Started SparkUI at
http://fphd4.ctpilot1.com:4040
14/10/15 14:36:40 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
14/10/15 14:36:40 INFO executor.Executor: Using REPL class URI:
http://10.18.30.154:49669
14/10/15 14:36:40 INFO repl.SparkILoop: Created spark context..
Spark context available as sc.
scala> case class Dummy(x: String) {
| val data:String = x
| }
defined class Dummy
scala> import scala.collection.mutable.MutableList
import scala.collection.mutable.MutableList
scala> val v = MutableList[Dummy]()
v: scala.collection.mutable.MutableList[Dummy] = MutableList()
scala> v += (new Dummy("a"))
<console>:16: error: type mismatch;
found : Dummy
required: Dummy
v += (new Dummy("a"))
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