Hi Manoj,
As you may be aware this means the reduces are unable to fetch intermediate data from TaskTrackers that ran map tasks - you can try: * increasing tasktracker.http.threads so there are more threads to handle fetch requests from reduces. * decreasing mapreduce.reduce.parallel.copies : so fewer copy / fetches are performed in parallel It could also be due to a temporary DNS issue. See slide 26 of this presentation for potential causes for this message: http://www.slideshare.net/cloudera/hadoop-troubleshooting-101-kate-ting-clou dera Not sure why you did not receive the problem before but was it the same data or different data? Did you have other jobs running on your cluster? Hope that helps Regards Vijay From: Manoj Babu [mailto:manoj...@gmail.com] Sent: 01 February 2013 15:09 To: user@hadoop.apache.org Subject: Reg Too many fetch-failures Error Hi All, I am getting Too many fetch-failures exception. What might be the reason for this exception, For same size of data i dint face this error earlier and there is change in code. How to avoid this? Thanks in advance. Cheers! Manoj.
