Hive启动出现权限错误 /tmp/hive on HDFS should be writable.

一．启动Hadoop后运行Hive时出现如下错误。

         Exception in thread "main"java.lang.RuntimeException: java.lang.RuntimeException:The root scratch dir:/tmp/hive on HDFS should be writable.

Exception in thread "main" java.lang.RuntimeException:
The root scratch dir: /tmp/hive on HDFS should be writable. Current permissions are: rwxr-xr-x
at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir(SessionState.java:705)
at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:635)
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:563)
at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java:531)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:705)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:641)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

二．错误分析。

从The root scratch dir: /tmp/hive on HDFS should be writable. Currentpermissions are: rwxr-xr-x可以看出。系统要求在hdfs上用户应该具备写权限，而从报错可以看出只有所有者具有写权限，所有组合其他用户不具备。

三．错误修改。

使用hadoop fs hadoop fs -chmod -R dir修改目录权限，如下 

root@hadoop22 ~]# hadoop fs -chmod -R 777 /tmp

使其他用户也具备本目录的写权限