一、启动HIVE报错：
[root@master ~]# hive
Logging initialized using configuration in jar:file:/usr/local/hive-1.2.2/lib/hive-common-1.2.2.jar!/hive-log4j.properties
Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: The root scratch dir: /tmp/hive on HDFS should be writable. Current permissions are: rwx------
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:621)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.lang.RuntimeException: The root scratch dir: /tmp/hive on HDFS should be writable. Current permissions are: rwx------
at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir(SessionState.java:612)
at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:554)
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:508)
... 8 more
[root@master ~]#
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@master ~]# hadoop fs -chmod -R 777 /tmp
使其他用户也具备本目录的写权限
