RE: Scheduler question

2013-09-13 Thread John Lilley
Thanks! That makes perfect sense. john From: Sandy Ryza [mailto:sandy.r...@cloudera.com] Sent: Monday, September 09, 2013 4:17 AM To: user@hadoop.apache.org Subject: Re: Scheduler question Hi John, YARN schedulers handle this with the concept of reservations. Scheduling decisions occur

Re: Scheduler question

2013-09-09 Thread Sandy Ryza
Hi John, YARN schedulers handle this with the concept of reservations. Scheduling decisions occur on node heartbeats. When a node that is full heartbeats, the next application that should be able to place a container on it gets to place a reservation on it. Each node has space for a single