使用以下python脚本通过配置单元查询cosmos：

import pyhs2

with pyhs2.connect(host='cosmos.lab.fiware.org',
                    port=10000,
                    authMechanism="PLAIN",
                    user='glaquidara',
                    password='*****',
                    database='default') as conn:
     with conn.cursor() as cur:
         cur.execute("select * from glaquidara_mazzi")
         print cur.getSchema()

         for i in cur.fetch():
             print i

生成以下错误：
回溯（最近一次调用last）：文件“libra.py”，第10行，在cur.execute（“select*from glaquidara\u mazzi”）文件“/library/python/2.7/site packages/pyhs2/cursor.py”，第64行，在execute raise pyhs2exception（res.status.errorcode，res.status.errormessage）pyhs2.error.pyhs2exception:'编译语句时出错：failed:runtimeexception org.apache.hadoop.ipc.remoteexception:org.apache.hadoop.hdfs.server.namenode.safemodeexception:cannot create directory/tmp/hive root/hive\ u 2015-10-07\ u 13-32-30\ u 348\ u 38078262746902303- 3. Name node is in safe mode.\nResources are low on NN. Safe mode must be turned off manually.\n\tat org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2140)\n\tat org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2114)\n\tat org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:892)\n\tat sun.reflect.GeneratedMethodAccessor586.invoke(Unknown Source)\n\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)\n\tat java.lang.reflect.Method.invoke(Method.java:597)\n\tat org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)\n\tat org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1439)\n\tat org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1435)\n\tat java.security.AccessController.doPrivileged(Native Method)\n\tat javax.security.auth.Subject.doAs(Subject.java:396)\n\tat org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)\n\tat org.apache.hadoop.ipc.Server$Handler.run(Server.java:1433)\n' 这有什么问题？