In spark installing README,I write command './bin/spark-shell', I got some hint follwing:
Found multiple Spark assembly jars in /opt/spark-0.9.0-incubating-bin-hadoop1/assembly/target/scala-2.10: spark-assembly-0.9.0-incubating-hadoop1.0.4.jar spark-assembly_2.10-0.9.0-incubating-hadoop1.0.4.jar Please remove all but one jar.
I ever try to remove one of them ,but I fail to success. If somebody can deal with it ,please tell me. thanks.