有人能告诉我如何构建Spark Cassandra连接器组件吗？我试着按照Github页面上的说明进行操作https://github.com/datastax/spark-cassandra-connector但我只收到数百个"重复数据消除"错误。
我使用的是Scala 2.11.7和Spark 1.5.1（我为Scala 2.11构建的）以及SBT 13.8。
我做了以下事情：
git clone https://github.com/datastax/spark-cassandra-connector.git
cd spark-cassandra-connector/
sbt -Dscala-2.11=true assembly
构建过程运行了一段时间，但随后开始抛出数百个"重复数据消除"错误并失败。我不知道从哪里开始解决这个问题，但目前我所能告诉的是，这个项目的组装构建过程根本不起作用。
关于如何解决这个问题，有什么建议吗？
2.11的构建似乎已损坏，您应该向项目报告。不知道现在该怎么修。
➜ spark-cassandra-connector git:(master) sbt
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
[info] Loading project definition from /Users/jacek/dev/oss/spark-cassandra-connector/project
Using releases: https://oss.sonatype.org/service/local/staging/deploy/maven2 for releases
Using snapshots: https://oss.sonatype.org/content/repositories/snapshots for snapshots
Scala: 2.10.5 [To build against Scala 2.11 use '-Dscala-2.11=true']
Scala Binary: 2.10
Java: target=1.7 user=1.8.0_66
[info] Set current project to root (in build file:/Users/jacek/dev/oss/spark-cassandra-connector/)
[root]> update
...
[info] Done updating.
[info] Done updating.
[success] Total time: 314 s, completed Dec 2, 2015 10:26:01 AM
[root]>
➜ spark-cassandra-connector git:(master) sbt -Dscala-2.11=true
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
[info] Loading project definition from /Users/jacek/dev/oss/spark-cassandra-connector/project
Using releases: https://oss.sonatype.org/service/local/staging/deploy/maven2 for releases
Using snapshots: https://oss.sonatype.org/content/repositories/snapshots for snapshots
Scala: 2.11.7
Scala Binary: 2.11
Java: target=1.7 user=1.8.0_66
[info] Set current project to root (in build file:/Users/jacek/dev/oss/spark-cassandra-connector/)
[root]> update
...
[error] impossible to get artifacts when data has not been loaded. IvyNode = org.slf4j#slf4j-log4j12;1.7.6
...
[trace] Stack trace suppressed: run last spark-cassandra-connector-embedded/*:update for the full output.
[error] (spark-cassandra-connector-embedded/*:update) java.lang.IllegalStateException: impossible to get artifacts when data has not been loaded. IvyNode = org.slf4j#slf4j-log4j12;1.7.6
[error] Total time: 9 s, completed Dec 2, 2015 10:27:19 AM
我提交了一个问题https://datastax-oss.atlassian.net/browse/SPARKC-295.