前阶段线上在做Hive升级（CDH4.2.0 Hive 0.10——> Apache Hive0.11 with our patches）和Shark上线踩了不少坑，先来说一个Hiveserver的问题.
beeline进入后随便执行一个查询就会报错：
USERxxx don’t have write privilegs under /tmp/hive-hdfs
不对啊，已经启用了impersonation怎么还会去hdfs下的scratchdir写入临时文件呢？查看下代码发现原来CDH4.2的Hive的impersonation和hive0.11在这处的判断行为是不同的：
Hive0.11 apache：只有在启用kerberos才使用hive-xxx作为scratchdir否则使用hiveserver的start user的scratchdir
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if
(
cliService.getHiveConf().getVar(ConfVars.HIVE_SERVER2_AUTHENTICATION)
.equals(HiveAuthFactory.AuthTypes.KERBEROS.toString())
&&
cliService.getHiveConf().
getBoolVar(ConfVars.HIVE_SERVER2_ENABLE_DOAS)
)
{
String delegationTokenStr =
null
;
try
{
delegationTokenStr = cliService.getDelegationTokenFromMetaStore(userName);
}
catch
(UnsupportedOperationException e) {
// The delegation token is not applicable in the given deployment mode
}
sessionHandle = cliService.openSessionWithImpersonation(userName, req.getPassword(),
req.getConfiguration(), delegationTokenStr);
}
else
{
sessionHandle = cliService.openSession(userName, req.getPassword(),
req.getConfiguration());
}
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Cloudera4.2.0的Hive0.10是只要启用了impersonation就使用独自的scratchdir...
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if
(cliService.getHiveConf().
getBoolVar(HiveConf.ConfVars.HIVE_SERVER2_KERBEROS_IMPERSONATION)) {
String delegationTokenStr =
null
;
try
{
delegationTokenStr = cliService.getDelegationTokenFromMetaStore(userName);
}
catch
(UnsupportedOperationException e) {
// The delegation token is not applicable in the given deployment mode
}
sessionHandle = cliService.openSessionWithImpersonation(userName, req.getPassword(),
req.getConfiguration(), delegationTokenStr);
}
else
{
sessionHandle = cliService.openSession(userName, req.getPassword(),
req.getConfiguration());
}
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并且这个作为一个Hiveserver的bug在0.13被修复：https://issues.apache.org/jira/browse/HIVE-5486
workaround也简单，就是把/tmp/hive-hdfs改成777就好了=。=坑爹啊
本文转自MIKE老毕 51CTO博客，原文链接：http://blog.51cto.com/boylook/1352929，如需转载请自行联系原作者
