Spark集群启动python shell错误： Could not resolve hostname localhost: Temporary failure

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最近在自己搭建的平台上测试spark-python脚本，发现一个错误如下：

<span style="font-size:14px;">[master@slave1 spark]$ bin/pyspark Python 2.6.6 (r266:84292, Jul 23 2015, 15:22:56) [GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2Type "help", "copyright", "credits" or "license" for more information./opt/spark/python/pyspark/sql/context.py:477: DeprecationWarning: HiveContext is deprecated in Spark 2.0.0. Please use SparkSession.builder.enableHiveSupport().getOrCreate() instead.  DeprecationWarning)Setting default log level to "WARN".To adjust logging level use sc.setLogLevel(newLevel).16/08/01 02:33:38 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicableTraceback (most recent call last):  File "/opt/spark/python/pyspark/shell.py", line 43, in <module>    spark = SparkSession.builder\  File "/opt/spark/python/pyspark/sql/session.py", line 169, in getOrCreate    sc = SparkContext.getOrCreate(sparkConf)  File "/opt/spark/python/pyspark/context.py", line 294, in getOrCreate    SparkContext(conf=conf or SparkConf())  File "/opt/spark/python/pyspark/context.py", line 115, in __init__    conf, jsc, profiler_cls)  File "/opt/spark/python/pyspark/context.py", line 174, in _do_init    self._accumulatorServer = accumulators._start_update_server()  File "/opt/spark/python/pyspark/accumulators.py", line 259, in _start_update_server    server = AccumulatorServer(("localhost", 0), _UpdateRequestHandler)  File "/usr/lib64/python2.6/SocketServer.py", line 412, in __init__    self.server_bind()  File "/usr/lib64/python2.6/SocketServer.py", line 423, in server_bind    self.socket.bind(self.server_address)  File "<string>", line 1, in bindsocket.gaierror: [Errno -3] Temporary failure in name resolution>>> num = sc.parallelize([1,2,3,4])Traceback (most recent call last):  File "<stdin>", line 1, in <module>NameError: name 'sc' is not defined</span>

刚开始无从下手，找不到错误的原因，过了一天之后再去看这个问题的时候，仔细一看是socket 即通信的问题，于是谷歌搜索了一番，终于知道原因了：

原因：

ssh 不能登录localhost 使用 ssh localhost 也报同样的错误说明免密码登录不能登录自己

这是因为我在配置hadoop集群时直接清除了/etc/hosts文件里的内容，所以在这里致使ssh localhost 不通

解决办法：

在/etc/hosts文件中加入以下内容：

<span style="font-size:14px;">localhost localhost4.localdomain4127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4::1         localhost localhost.localdomain localhost6 localhost6.localdomain6</span>

再次启动pysaprk 或者执行 py文件就可以了

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