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问题描述： org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /tmp/hadoop-yarn/staging/hadoop/.staging/job_1519998981934_0001/job.jar could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.
问题分析：There are 0 datanode(s) 使用jps查看有哪些进程正在运行，发现datanode节点没有在运行说明是由于该节点没有正常启动导致数据无法存放，从而发生错误。
问题解决：停止现在运行的所有进程，然后重新启动。主要是 datanode.
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Hadoop问题：There are 0 datanode(s) running and no node(s) are excluded in this operation.
There are 0 datanode(s) running and no node(s) are excluded in this operation.
hadoop报错：There are 653 missing blocks. The following files may be corrupted
hadoop报错：There are 653 missing blocks. The following files may be corrupted
hadoop报错：There are 653 missing blocks. The following files may be corrupted
hadoop报错：There are 653 missing blocks. The following files may be corrupted