踢砖头

By default settings Hadoop use /tmp/ folder to track NameNode and JobTracker process id alive. But /tmp folder is cleanup once a week. So after some time, you will get error when you try to shutdown H

如果你需要在HBase的数据上做MapReduce任务，记得打开压缩选项。IO speed is always performance bottleneck in any case. So focus on IO performance generally is best practice for performance tuning.Data compression

没啥说的记录一下：hive -hiveconf hive.root.logger=DEBUG,console