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Apache Hadoop for System Administrators
Allen Wittenauer
Twitter: @_a__w_
Email: aw@apache.org
Hadoop Deployed Now?
Planning Hadoop Deployment?
Needed some place
to sit before lunch?
An Extremely Quick &
Incomplete Intro to Hadoop
 Map (“transform”)
– Perl:

@items=(1,2,3,4,5);
sub sqr {return $_**2);
print join(‘,’,map(sqr,@items));
1,4,9,16,25
– Python:

items = [1,2,3,4,5]
def sqr(x) : return x**2
print list(map(sqr,items))
[1, 4, 9, 16, 25]
 Reduce (“compress” or “fold”)
– Perl

use List::Util qw/reduce/;
@items=(1,4,9,16,25);
print reduce {$a>$b ? $a:$b} @items;
25
– Python

from functools import reduce
items = [1,4,9,16,25]
print reduce ((lambda x,y: x if
(x>y) else y), items)
25
NEVER

GIVE

GONNA

YOU UP
Hadoop
(‘common’ or ‘core’)

MapReduce

HDFS
Hadoop
(‘common’ or ‘core’)

MapReduce

S3
Hadoop
(‘common’ or ‘core’)

MapReduce

Gluster
Hadoop
(‘common’ or ‘core’)

HBase

HDFS
NameNode

DataNode

DataNode

DataNode

D

D

D

D

D

D

ext4

ext4

ext4

ext4

ext4

ext4
JobTracker

TaskTracker
M

M

R

R

TaskTracker
M

M

R

R

TaskTracker
M

M

R

R
JobTracker

TaskTracker
M

M

R

R

TaskTracker
M

M

R

R

TaskTracker
M

M

R

R
Name
Node

DN

DN

DN

DN

DN

D D D D
M M R R

D D D D
M M R R

D D D D
M M R R

D D D D
M M R R

D D D D
M M R R

TT

TT

TT

TT

TT

Job
Tracker
Hadoop isn’t designed for
system administrators and/or support staff.
“Hadoop is not a developer problem;
it’s an operations problem.”
-- Hadoop vendor ex-employee
Don’t Make Assumptions
tail’ing the logs won’t
tell you the whole story.
%
Monitor the masters!
 LinkedIn’s Configuration
– 30+ Health Checks per Grid
 Masters, canary report, daily fsck, etc

Nagios

– 10+ Health Checks per DC
 LDAP, Kerberos, etc ...

– Cross-DC Nagios Server Checks

ZK

 Warn: 5% down nodes
 Panic: 30% down
 HDFS: 20% Free Space
 Gateway home dir: 10% free
space
 ...

VD

NN

JT

Compute
Nodes

AZ

GW
 Health Check Script
– “OK” - good status
– “ERROR (message)” - bad status

mapred.healthChecker.script.path

 Consider checking ...
– critical software
– ownership & permissions
– network connection speed
– drive count

– file system space
– RO file systems
– IO errors
– missing memory
 Use the tools most of your user’s code is written in!
 Pig
– testfile:

100
– Code:

A = load 'testfile' using PigStorage(',')
as (i: int);
B = foreach C generate i;
C = distinct B;
dump C;
– Output:

(100)
Reactive
Proactive
Resource Controls
 JobTracker Memory Resource Controls
– Limit jobs stored in JT heap:
mapred.jobtracker.completeuserjobs.maximum
– Limit total # of job tasks: mapred.jobtracker.maxtasks.per.job

 Job Memory Resource Controls
– Scheduler-level: mapred.cluster.*.memory.mb
– TT-level: auto-calculated based upon MR slot counts & scheduler level settings
– MR Job-level: mapred.job.*.memory.mb
– Linux only: /proc memory calculator and task killer
“I set the heap to 1G but my
process ran out of memory?”
Treat HDFS like any other multi-tenant FS
 Quota everything
– Yes, including /tmp
– No “show me all quotas” functionality

dfsadmin -setQuota
dfsadmin -setSpaceQuota

 Be consistent:
– /user/* all get same quota

 Be flexible:
– Make another dir for user’s to store big projects (e.g., /project)

 Be smart:
– Have a policy that content in /tmp gets deleted after X days. Automate this!
– Build reporting that shows files that are replicated less than 3 times
Compute Node Disk
Partitioning as Protective Measure
 root partitioning

20 GB /, ...

200 GB task space

(rest) HDFS

 non-root partinioning

5 GB
swap

200 GB task space

(rest) HDFS
Security!
 Queue Level ACLs

mapred-queue-acls.xml

– users
– groups
– netgroups

 Service Level ACLs
– hosts
– users
– groups
– netgroups

hadoop-policy.xml

– Limitation: Web services are all or nothing! :(
– Be aware: Hadoop uses ephemeral ports all over the place! :(
Kerberos!
Corp IT
Active Directory
@CORP

krbtgt/GRID@CORP

krbtgt/host@GRID
krbtgt/service@GRID

Password

Client Node

Grid Realm
@GRID

krbtgt/user@CORP
krbtgt/GRID@CORP

Hadoop
Services
http://data.linkedin.com/opensource/white-elephant
 Fonzi: http://www.flickr.com/photos/elzey/7224689810
 Captain Obvious by artist Stuart McGhee. http://stuartmcghee.com/
 Ant on flower: http://www.flickr.com/photos/bolonski/6116358907
 Ant Colony: http://www.flickr.com/photos/klearchos/2821230516
 Ant Queen: http://commons.wikimedia.org/wiki/
File:Camponotus_crispulus_queen_ant.jpg
 Canary: http://www.flickr.com/photos/nathan_and_jenny/2454127424
 Mona Lisa: Leonardo Da Vinci
 White Elephant: http://data.linkedin.com/opensource/white-elephant
 Ecce Homo:
– Elías García Martínez (original)
– Cecilia Giménez (restored)
Thanks!
Contact:
Twitter: @_a__w_
Email: aw@apache.org
More info:
Quora: www.quora.com/user/allenwittenauer
SlideShare: www.slideshare.net/allenwittenauer

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