[ http://issues.apache.org/jira/browse/HADOOP-195?page=comments#action_12378655 ]
Owen O'Malley commented on HADOOP-195: -------------------------------------- Since there is obviously interest in my benchmark, here is an update: I reran my sort test yesterday with: 1. fewer reduces (2/node) (hadoop-202) 2. the map ids replaced with integers (hadoop-200) 3. the number of server threads for map output serving set to 20 I sorted 1760 gig of data on 179 nodes in 18.6 hours, which is much better than before. I had 20 reduce tasks fail and reexecute themselves (last original reduce finished in ~16.5 hours) 2 of those tasks were assigned to the same node and were the only two tasks running for the last hour, which clearly shows that we need speculative reduces. > transfer map output transfer with http instead of rpc > ----------------------------------------------------- > > Key: HADOOP-195 > URL: http://issues.apache.org/jira/browse/HADOOP-195 > Project: Hadoop > Type: Improvement > Components: mapred > Versions: 0.2 > Reporter: Owen O'Malley > Assignee: Owen O'Malley > Fix For: 0.3 > Attachments: netstat.log, netstat.xls > > The data transfer of the map output should be transfered via http instead > rpc, because rpc is very slow for this application and the timeout behavior > is suboptimal. (server sends data and client ignores it because it took more > than 10 seconds to be received.) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
