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An Introduction to MapReduce 2 and YARN
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An Introduction to MapReduce 2 and YARN
1.
An Introduction to MapReduce
2 and YARN Tom White April 25, 2012 Seattle Hadoop / Scalability / NoSQL Meetup Wednesday, April 25, 2012
2.
First, whatʼs MapReduce 1? Wednesday,
April 25, 2012
3.
Wednesday, April 25,
2012
4.
Whatʼs wrong with MR1? Wednesday,
April 25, 2012
5.
Motivation •Scaling >4000 nodes •HA
of Job Tracker •Poor resource utilization Wednesday, April 25, 2012
6.
Yet Another Resource
Negotiator Wednesday, April 25, 2012
7.
Wednesday, April 25,
2012
8.
Wednesday, April 25,
2012
9.
Node Manager is a
generalized Task Tracker • Task Tracker • fixed number of map or reduce slots • Node Manager • containers with variable resource limits Wednesday, April 25, 2012
10.
Wednesday, April 25,
2012
11.
Wednesday, April 25,
2012
12.
MR is user
space YARN is kernel Wednesday, April 25, 2012
13.
Bonus Apps •Distributed shell •MPI
(MAPREDUCE-2911) •Master-worker(MAPREDUCE-3315) •Apache Giraph, Hama Wednesday, April 25, 2012
14.
Wednesday, April 25,
2012
15.
Wednesday, April 25,
2012
16.
Old API ≠
MR1 New API ≠ MR2 Wednesday, April 25, 2012
17.
Old API o.a.h.mapred New API o.a.h.mapreduce MR1
✓ ✓ MR2 ✓ ✓ Wednesday, April 25, 2012
18.
Wednesday, April 25,
2012
19.
Try out MR2 •Apache
Hadoop 0.23.1 •CDH4 Beta 2 Wednesday, April 25, 2012
20.
<dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>1.0.2</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>0.23.1</version> </dependency> MR1 MR2 Wednesday, April 25,
2012
21.
TODO • Still alpha
status • Performance tuning • Usability bug fixes • RM recovery • Security in MR2 not complete Wednesday, April 25, 2012
22.
Further Reading Wednesday, April
25, 2012
23.
Thank You! Wednesday, April
25, 2012
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