Hi, I too was stuck at this problem. On investigation i found that this error occurs when reduce task is trying to resolve hostname of task tracker returned by map task. I recompiled hadoop code . map reduce and all queries started working. However , task tracker at second datanode stopped working . I am running mapreduce on only 1 task tracker to process data. I am stuck at it for some time . Any hints to the solution will be appreciated.
Vaibhav Negi On Tue, Oct 12, 2010 at 5:59 PM, Narendra <uncle.n...@gmail.com> wrote: > Even I am facing the same issue. In fact, select * works but if you give a > where clause, it cribs. > > Regards, > Narendra > > On Mon, Oct 11, 2010 at 1:40 PM, Guru Prasad > <guru.pra...@ibibogroup.com>wrote: > >> Hi all, >> When i am running "select count(1) from searchlogs", I am getting >> following errors. >> While "select * from searchlogs" is working properly. >> >> >> -------------------------------------------------------------------------------------- >> 2010-10-11 03:52:54,371 Stage-1 map = 0%, reduce = 0% >> 2010-10-11 03:53:00,467 Stage-1 map = 4%, reduce = 0% >> 2010-10-11 03:53:02,542 Stage-1 map = 5%, reduce = 0% >> 2010-10-11 03:53:03,566 Stage-1 map = 9%, reduce = 0% >> 2010-10-11 03:53:05,640 Stage-1 map = 13%, reduce = 0% >> 2010-10-11 03:53:06,644 Stage-1 map = 16%, reduce = 0% >> 2010-10-11 03:53:08,671 Stage-1 map = 20%, reduce = 0% >> 2010-10-11 03:53:09,720 Stage-1 map = 24%, reduce = 0% >> 2010-10-11 03:53:11,824 Stage-1 map = 29%, reduce = 0% >> 2010-10-11 03:53:14,883 Stage-1 map = 36%, reduce = 0% >> 2010-10-11 03:53:18,000 Stage-1 map = 44%, reduce = 0% >> 2010-10-11 03:53:21,037 Stage-1 map = 51%, reduce = 0% >> 2010-10-11 03:53:24,085 Stage-1 map = 56%, reduce = 0% >> 2010-10-11 03:53:27,203 Stage-1 map = 62%, reduce = 0% >> 2010-10-11 03:53:30,294 Stage-1 map = 69%, reduce = 0% >> 2010-10-11 03:53:33,519 Stage-1 map = 75%, reduce = 0% >> 2010-10-11 03:53:36,599 Stage-1 map = 82%, reduce = 0% >> 2010-10-11 03:53:39,866 Stage-1 map = 89%, reduce = 0% >> 2010-10-11 03:53:41,931 Stage-1 map = 91%, reduce = 0% >> 2010-10-11 03:53:42,942 Stage-1 map = 95%, reduce = 0% >> 2010-10-11 03:53:45,031 Stage-1 map = 98%, reduce = 0% >> 2010-10-11 03:53:46,042 Stage-1 map = 100%, reduce = 0% >> 2010-10-11 03:53:52,083 Stage-1 map = 100%, reduce = 1% >> *2010-10-11 03:54:21,328 Stage-1 map = 100%, reduce = 0%* >> 2010-10-11 03:54:33,424 Stage-1 map = 100%, reduce = 2% >> 2010-10-11 03:55:12,690 Stage-1 map = 100%, reduce = 3% >> *2010-10-11 03:55:42,905 Stage-1 map = 100%, reduce = 0%* >> 2010-10-11 03:55:55,010 Stage-1 map = 100%, reduce = 4% >> 2010-10-11 03:56:10,106 Stage-1 map = 100%, reduce = 5% >> 2010-10-11 03:56:49,384 Stage-1 map = 100%, reduce = 7% >> *2010-10-11 03:57:04,478 Stage-1 map = 100%, reduce = 0%* >> 2010-10-11 03:57:16,558 Stage-1 map = 100%, reduce = 7% >> 2010-10-11 03:57:31,679 Stage-1 map = 100%, reduce = 8% >> 2010-10-11 03:58:08,901 Stage-1 map = 100%, reduce = 9% >> *2010-10-11 03:58:27,026 Stage-1 map = 100%, reduce = 0%* >> 2010-10-11 03:58:33,067 Stage-1 map = 100%, reduce = 100% >> Ended Job = job_201009280549_0050 with errors >> >> Failed tasks with most(4) failures : >> Task URL: >> http://xx.xx.xx.xxx:50030/taskdetails.jsp?jobid=job_201009280549_0050&tipid=task_201009280549_0050_r_000000 >> >> FAILED: Execution Error, return code 2 from >> org.apache.hadoop.hive.ql.exec.ExecDriver >> >> ----------------------------------------------------------------------------------------------------------------------- >> >> Please help me out. >> >> Thanks & Regards >> Guru Prasad >> ~guru >> >> This message is intended only for the use of the addressee and may contain >> information that is privileged, confidential >> and exempt from disclosure under applicable law. If the reader of this >> message is not the intended recipient, or the >> employee or agent responsible for delivering the message to the intended >> recipient, you are hereby notified that any >> dissemination, distribution or copying of this communication is strictly >> prohibited. If you have received this e-mail >> in error, please notify us immediately by return e-mail and delete this >> e-mail and all attachments from your system. >> >> >
