解决使用SBT编译Spark出现UNRESOLVED DEPENDENCIES的问题

```
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	::          UNRESOLVED DEPENDENCIES         ::
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	:: org.apache.spark#spark-network-common_2.10;1.4.1: configuration not public in org.apache.spark#spark-network-common_2.10;1.4.1: 'test'. It was required from org.apache.spark#spark-network-shuffle_2.10;1.4.1 test
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] 	Note: Unresolved dependencies path:
[warn] 		org.apache.spark:spark-network-common_2.10:1.4.1 ((com.typesafe.sbt.pom.MavenHelper) MavenHelper.scala#L76)
[warn] 		  +- org.apache.spark:spark-network-shuffle_2.10:1.4.1
sbt.ResolveException: unresolved dependency: org.apache.spark#spark-network-common_2.10;1.4.1: configuration not public in org.apache.spark#spark-network-common_2.10;1.4.1: 'test'. It was required from org.apache.spark#spark-network-shuffle_2.10;1.4.1 test
	at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:278)
	at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:175)
	at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:157)
	at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:151)
	at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:151)
	at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:128)
	at sbt.IvySbt.sbt$IvySbt$$action$1(Ivy.scala:56)
	at sbt.IvySbt$$anon$4.call(Ivy.scala:64)
	at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:93)
	at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:78)
	at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:97)
	at xsbt.boot.Using$.withResource(Using.scala:10)
	at xsbt.boot.Using$.apply(Using.scala:9)
	at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:58)
	at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:48)
	at xsbt.boot.Locks$.apply0(Locks.scala:31)
	at xsbt.boot.Locks$.apply(Locks.scala:28)
	at sbt.IvySbt.withDefaultLogger(Ivy.scala:64)
	at sbt.IvySbt.withIvy(Ivy.scala:123)
	at sbt.IvySbt.withIvy(Ivy.scala:120)
	at sbt.IvySbt$Module.withModule(Ivy.scala:151)
	at sbt.IvyActions$.updateEither(IvyActions.scala:157)
	at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1318)
	at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1315)
	at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$85.apply(Defaults.scala:1345)
	at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$85.apply(Defaults.scala:1343)
	at sbt.Tracked$$anonfun$lastOutput$1.apply(Tracked.scala:35)
	at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1348)
	at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1342)
	at sbt.Tracked$$anonfun$inputChanged$1.apply(Tracked.scala:45)
	at sbt.Classpaths$.cachedUpdate(Defaults.scala:1360)
	at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1300)
	at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1275)
	at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
	at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
	at sbt.std.Transform$$anon$4.work(System.scala:63)
	at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
	at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
	at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
	at sbt.Execute.work(Execute.scala:235)
	at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
	at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
	at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
	at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
[error] (network-shuffle/*:update) sbt.ResolveException: unresolved dependency: org.apache.spark#spark-network-common_2.10;1.4.1: configuration not public in org.apache.spark#spark-network-common_2.10;1.4.1: 'test'. It was required from org.apache.spark#spark-network-shuffle_2.10;1.4.1 test
[error] Total time: 20 s, completed 2015-8-8 19:24:44
```

sbt使用ivy管理依赖，出现这个问题是因为本地的包缓存冲突导致的。

解决方案：

删除：~/.ivy2/cache，然后重新执行编译命令就可以了。

解决使用SBT编译Spark出现UNRESOLVED DEPENDENCIES的问题

请我喝咖啡