MR1 vs YARN


MR1:

1. It supports up to 4000 nodes cluster.
2. Name node is the single point of failure.
3. We cannot run other frameworks like spark on MR1.
4. Job tracker will take care of monitoring &executing the tasks.

YARN(Yet Another Resource Manager):

1. It supports up to 6000 nodes cluster.
2. Introduced High Availability,Fail-over & Fencing concepts to over come Namenode Single point of failure.
3. We can run spark & other thing on top of YARN.
4. Job tracker tasks were divided into Resource Manager,Node Manager,Application Master.

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