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Hadoop >> mail # user >> meaning or usage of reserved containers in YARN Capacity scheduler


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Re: meaning or usage of reserved containers in YARN Capacity scheduler
Apologies for the late reply.

The concept of reservation is used to prevent starvation.

For e.g. let's say you have 2 machines with 8G each. Now each of those are running containers which take up 6G on nodeA and 7G on nodeB.

Another application comes in and then asks for a single container of 4G, which can't be allocated anywhere in the cluster. In this case (e.g.) 4G is reserved on nodeA and is given to the app only when it's available… else, this application would be 'starved' if other apps came in and asked for 1G or 2G and would hence, 4G would never be freed up.

Hope that helps.

Arun

On Feb 7, 2014, at 7:58 AM, ricky l <[EMAIL PROTECTED]> wrote:
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/

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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB