[ http://issues.apache.org/jira/browse/HADOOP-195?page=comments#action_12378685 ]
Owen O'Malley commented on HADOOP-195: -------------------------------------- As to why we lost the 20 reduces, here is the breakdown: no progress update to task tracker for 20 min: 11 rpc timeout on progress: 4 lost task tracker (no heartbeat to job tracker for 10 min): 3 exit 65 (caused by ping failures): 4 one task had exit 65 and lost task tracker one task had exit 65 and no progress update so it task tracker latency is still a big concern. > 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
