Which is the default scheduler in YARN?
A.
YARN doesn’t configure a default scheduler, you must first assign an appropriate scheduler
class in yarn-site.xml
B.
Capacity Scheduler
C.
Fair Scheduler
D.
FIFO Scheduler
Explanation:
http://hadoop.apache.org/docs/r2.4.1/hadoop-yarn/hadoop-yarnsite/CapacityScheduler.html
Answer is “C” – Fair Scheduler is Default Scheduler on Cloudera platform.
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But Capacity Scheduler(B) is default scheduler for Hadoop 2.X
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C
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Answer is C.
Cloudera Manager, CDH 5, and CDH 4 set the default to Fair Scheduler
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Per yarn-default.xml for apache hadoop it capacity scheduler, but for CDH its fair scheduler.
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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The scheduler defaults for MapReduce and YARN are:
MapReduce – Cloudera Manager, CDH 5, and CDH 4 set the default to FIFO. FIFO is set as the default for backward-compatibility purposes, but Cloudera recommends Fair Scheduler because Impala and Llama are optimized for it. Capacity Scheduler is also available.
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.
http://www.cloudera.com/content/www/en-us/documentation/enterprise/5-3-x/topics/admin_rm.html
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Question is something as follows
Which is the default scheduler for YARN in CDH 5?
Question clearly mentioned CDH 5.
(I tried the test on 22-Nov-2015 and scored 87%. Same questions and options were asked but in different order. I chose the answers based on the discussion in this site)
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What is the correct answer for this question?
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Thanks Sijo for your clarification.
my view: it should be C “Fair Scheduler”
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Wrote my CCAH CCA-500 exam last weekend and passed with 93%! (The passing score now is 70%). Total 60 questions, most of them were about Hadoop Cluster Installation and Administration, HDFS, YARN and MapReduce version 2 (MRv2) and Hadoop Cluster Planning(about 75% of all questions were on those 4 points), also, some questions (25% more or less) on Resource Management and Monitoring and Logging. I used premium CCA-500 dumps (pdf and vce dumps here: https://tr.im/3CEJa) for preparing for the exam, all questions were available in that premium dumps, 100% valid now.
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Can you please send me the dump with the correct answer?
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Hello Sudha,
If you have the dump with correct answers could you please share it.
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Zim,
What is the correct answer for the following question?
Which is the default scheduler in YARN?
A.
YARN doesn’t configure a default scheduler, you must first assign an appropriate scheduler
class in yarn-site.xml
B.
Capacity Scheduler
C.
Fair Scheduler
D.
FIFO Scheduler
-Thanks
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B
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sorry guys…C is correct answers.
Ref
http://www.cloudera.com/documentation/enterprise/5-4-x/topics/admin_rm.html
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C
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Answer is – C
http://www.cloudera.com/documentation/enterprise/5-4-x/topics/admin_rm.html
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C. Fair Scheduler is default by Cloudera. Please check the documentation to confirm. Link in posts above.
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Apache yarn – default to Capacity Scheduler
https://www.safaribooksonline.com/library/view/hadoop-the-definitive/9781491901687/ch04.html
Cloudera default is FAIR .
here the question is about Yarn, so it is B Capacity scheduler
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B
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B is the answer. Capacity Scheduler is the default scheduler in Yarn.
Other distributions like CDH defaults to Fair.
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C
This exam is only for cloudera admin , (not apache hadoop admin)
so, queation is Which is the default scheduler in YARN (Cloudera) ?
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Answer is B. Capacity Scheduler
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Answer is B
yarn.resourcemanager.scheduler.class org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler
ref : http://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-common/yarn-default.xml
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Correct answer is B
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