Which is the default scheduler in YARN?
A.
Fair Scheduler
B.
FIFO Scheduler
C.
Capacity Scheduler
D.
YARN doesn’t configure a default scheduler. You must first assign a appropriate scheduler
class in yarn-site.xml
Explanation:
http://hadoop.apache.org/docs/r2.3.0/hadoop-yarn/hadoop-yarn-site/FairScheduler.html
It should be C …. YARN uses capacity scheduler as default …. though cloudera doesn’t support capacity scheduler.
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For cloudera its A – Fair Scheduler
(YARN – Cloudera Manager, CDH 5, and CDH 4 set the default to Fair Scheduler. Cloudera recommends Fair Scheduler because Impala and Llama are optimized for it. FIFO and Capacity Scheduler are also available.)
Ref: http://www.cloudera.com/content/cloudera/en/documentation/core/v5-2-x/topics/admin_rm.html
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Default scheduler for yarn is FIFO, due to backward compatibility, but if we are using CM then cloudera recommends to use Fair Scheduler.
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Default scheduler for YARN is Capacity. check default-yarn.xml.
The class to use as the resource scheduler.
yarn.resourcemanager.scheduler.class
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler
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Should be Fair Scheduler since this is CLoudera exam. Went to the training and the tutor repeatedly said it.. In E.sammer book is FIFO
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I have the same idea. A
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