[ https://issues.apache.org/jira/browse/MAPREDUCE-7070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sunil Govindan updated MAPREDUCE-7070: -------------------------------------- Target Version/s: 3.3.0 (was: 2.6.6, 3.2.0) Bulk update: moved all 3.2.0 non-blocker issues, please move back if it is a blocker. > Batch calls to RackResolver from AM > ----------------------------------- > > Key: MAPREDUCE-7070 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-7070 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: applicationmaster, performance > Reporter: Greg Phillips > Priority: Minor > Attachments: MAPREDUCE-7070.patch > > > TaskAttemptImpl calls RackResolver once for every split location. This > results in many shells being spawned by the Application Master when the > topology script is enabled. The worst case scenario would entail one call to > the topology script for each Datanode. The NameNode is also topology aware, > and uses batch calls to the topology script to improve performance. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: mapreduce-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: mapreduce-issues-h...@hadoop.apache.org