spark , NoSuchMethodError: ConcurrentHashMap.keySet 和failed to connect to master的错
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spark-env.sh里加上
export SPARK_MASTER_IP=127.0.0.1
export SPARK_MASTER_PORT=7077
export SPARK_LOCAL_IP=127.0.0.1
用jdk1.8编译的，结果用jdk1.7运行
http://stackoverflow.com/questions/24852807/spark-streaming-stateful-network-word-count
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