[ http://issues.apache.org/jira/browse/HADOOP-195?page=comments#action_12412092 ]
Owen O'Malley commented on HADOOP-195: -------------------------------------- I wrote a network bandwidth tester that just uses Java sockets to connect all nodes to all nodes. My application waits until all of the servers are up and starts sending data (10g/node) using Java's sockets. On my cluster, which is currently at 202 nodes, it took an average of 1423 seconds (mean of 1630) to finish the transfer between nodes. That is substantially faster than Hadoop's shuffle (7 hours?) and means that we have a long way to go in terms of shuffle optimization. > 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: MapFileSimulator.java, data-transfer-chart.pdf, > mapfilesimulator-big.txt, mapfilesimulator-sort2.txt, 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
