Error in Hadoop Installation
 

I'm just starting to use Linux and am trying to install Hadoop onto my computer. I downloaded the Hadoop file from a mirror recommended by Apache. The file is hadoop-2.2.0.tar.gz. Every website that I have read says that the command "tar -xzvf hadoop-2.2.0.tar.gz" should be able to unpack the file, but I keep getting the error "Error opening archive: Failed to open 'hadoop-2.2.0.tar.gz' "

I have tried both xzf and xvzf, neither seems to solve the problem.

Was I perhaps supposed to do something before I unpacked the file? What is going on?
(My computer is running OSX 10.9.3)

Note: I just started using this forum so I wasn't sure which category I should have posted this thread under; excuse me if this is the wrong category.

That's apple. Isn't there a guy somewhere who's paid to answer that question?

Do you suggest I call Apple customer service?

well you paid for support (as part of your initial purchase) but i doubt they will be able to answer a question like that.

judging by the filename the command you are running should work.

i have in the past tried to do programming on apple and stuff like netcat/gcc/... were surprisingly missing.

can you show us the output of the file command to make sure it is indeed a gnu-zip.

maybe the version of tar for apple is missing the functionality to de/compress

Sorry for asking, but what exactly is the output of the file command?

man file.

just type in and copy-pasta the output in your next response.

not to sound snarky but if you dont know the file command, how do you expect to administer a multi-node hadoop cluster with a distributed filesystem (in fact i'm not even convinced hadoop can be installed on mac -- i just looked it on duckduckgo: https://wiki.apache.org/hadoop/Runni...ode_Cluster%29) ?

what are you trying to do. i am not trying to dissuade you but perhaps you are going about it the wrong way ?a clarification although mac os uses the unix kernel it is not the same as using gnu/linux. the linux kernel is similar but not the same as unix.

No offense taken. This is my first computer science-related job so I'm still trying to find my way.

I'm almost certain that hadoop can be installed on Mac; there are a few websites with instructions on how to do so. I don't doubt that I could be going about it the wrong way though.

Thanks, good to know!

Macintosh:~ hadoop$ file hadoop-2.2.0.tar.gz
hadoop-2.2.0.tar.gz: cannot open `hadoop-2.2.0.tar.gz' (No such file or directory)

The file is definitely in my Downloads folder. Should I move it somewhere else?

maybe you are currenlty not in the rite directory (which would explain why its not finding it).

type in:and post the results.

Macintosh:~ hadoop$ pwd
/Users/hadoop
Macintosh:~ hadoop$ ls -al
total 40
drwxr-xr-x+ 16 hadoop staff 544 Jun 25 20:32 .
drwxr-xr-x 7 root admin 238 Jun 25 20:14 ..
-rw------- 1 hadoop staff 3 Jun 25 20:12 .CFUserTextEncoding
-rw-r--r--@ 1 hadoop staff 15364 Jun 25 21:06 .DS_Store
drwx------ 4 hadoop staff 136 Jun 26 23:50 .Trash
-rw------- 1 hadoop staff 404 Jun 26 23:50 .bash_history
drwx------ 5 hadoop staff 170 Jun 25 20:34 .ssh
drwx------ 3 hadoop staff 102 Jun 25 20:18 Applications
drwx------+ 7 hadoop staff 238 Jun 25 21:16 Desktop
drwx------+ 4 hadoop staff 136 Jun 26 18:39 Documents
drwx------+ 8 hadoop staff 272 Jun 25 21:08 Downloads
drwx------@ 45 hadoop staff 1530 Jun 27 14:58 Library
drwx------+ 3 hadoop staff 102 Jun 25 20:12 Movies
drwx------+ 3 hadoop staff 102 Jun 25 20:12 Music
drwx------+ 3 hadoop staff 102 Jun 25 20:12 Pictures
drwxr-xr-x+ 5 hadoop staff 170 Jun 25 20:12 Public

Should I cd to Downloads?

^ sure.

I think it worked! I didn't get an error this time. Thank you so much!!

In retrospect, this was a really dumb question to post. Sorry about that.

I have 2 more questions:
1. After tar -xzf hadoop-2.2.0.tar.gz the instructions say to type chown -R hadoop hadoop-2.2.0.tar.gz. What does the second command do?
2. The Apache website says to verify the integrity of the downloaded hadoop file using the PGP signature. I didn't do this because I couldn't find the public keys and the asc signature file. Will this be an issue later on when I am configuring or using hadoop?

It makes a user named hadoop the owner of the archive hadoop-2.2.tar.gz.
Probably not, it's normally just an md5checksum to insure the source file and destination file are identical, it's normally needed after that.

Thanks!

So now I am supposed to edit the .bashrc file, but I can't locate the .bashrc file. Instructions say I should "update its appropriate configuration files instead of .bashrc" if I don't have a .bashrc file. (Although I'm pretty certain I do have a .bashrc file.)
What are my appropriate configuration files, can you tell?

Macintosh:hadoop hadoop$ cd /Users/hadoop/Downloads/hadoop-2.2.0/etc/hadoop
Macintosh:hadoop hadoop$ ls
capacity-scheduler.xml httpfs-site.xml
configuration.xsl log4j.properties
container-executor.cfg mapred-env.cmd
core-site.xml mapred-env.sh
hadoop-env.cmd mapred-queues.xml.template
hadoop-env.sh mapred-site.xml
hadoop-metrics.properties mapred-site.xml.template
hadoop-metrics2.properties slaves
hadoop-policy.xml ssl-client.xml.example
hdfs-site.xml ssl-server.xml.example
httpfs-env.sh yarn-env.cmd
httpfs-log4j.properties yarn-env.sh
httpfs-signature.secret yarn-site.xml