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Which is the default scheduler in YARN?

Which is the default scheduler in YARN?

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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

25 Comments on “Which is the default scheduler in YARN?

  1. Dev says:

    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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  2. Sijo says:

    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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  3. Sijo says:

    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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  4. zimierz says:

    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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  5. Sud says:

    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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  6. pangi says:

    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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