Greg Phillips created MAPREDUCE-7070: ----------------------------------------
Summary: 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 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-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: mapreduce-dev-h...@hadoop.apache.org