---------- Forwarded message ---------- From: air <cnwe...@gmail.com> Date: 2011/8/9 Subject: CDH3 U1 Hive Job-commit very slow To: CDH Users <cdh-u...@cloudera.org>
when I submit a ql to hive, it is a very long time until it really submit the job to the hadoop cluster, what may cause this problem ?* *thank you for your help.* hive> select count(1) from log_test where src='test' and ds='2011-08-04'; Total MapReduce jobs = 1 Launching Job 1 out of 1 Number of reduce tasks determined at compile time: 1 In order to change the average load for a reducer (in bytes): set hive.exec.reducers.bytes.per.reducer=<number> In order to limit the maximum number of reducers: set hive.exec.reducers.max=<number> In order to set a constant number of reducers: set mapred.reduce.tasks=<number> * <------------------------stay here for a long time.. -- Knowledge Mangement . -- Knowledge Mangement .
