Compiling: MongoDB error

[Sayat Satybaldiev]

Hi,

I'm trying to use BG to use it with mongodb client but I have troubles with ant-contrib-1.0b3.jar.

I'm using Mac OS X. What I've did so far.

1. Unziped BGv0.1.4344.zip

2. Compile with: 

ant clean

ant 

ant dbcompile-mongodb - > to compile mongdb client too.

3. Then I try to execute the client: 

java -cp build/bg.jar;db/MongoDB/lib/*; edu.usc.bg.base.Client -schema -db MongoDB.MongoDbClient -p mongodb.url=127.0.0.1:27017 

it gives me following error:

-bash: db/MongoDB/lib/ant-contrib-1.0b3.jar: Permission denied

So, I've changed permission with chmod +x comman and the error gone. However, now it gives me the following error:

db/MongoDB/lib/ant-contrib-1.0b3.jar: line 1: PK: command not found

db/MongoDB/lib/ant-contrib-1.0b3.jar: line 2: ?]b5: command not found

db/MongoDB/lib/ant-contrib-1.0b3.jar: line 3: syntax error near unexpected token `)'

db/MongoDB/lib/ant-contrib-1.0b3.jar: line 3: ?]b5??????META-INF/MANIFEST.MFM??? Ew???>???M;upjӵAĔ???????ܓ{?lSf/[????.H?j?PX%o)?E???X?????lD??`p&.iO???`??????P?o?;??????J??F? ??H?HJ(?PK'

-bash: build/classes/edu/usc/bg/base/Client: No such file or directory

[Shahram Ghandeharizadeh]

Try to give read permission to the jar file and see if it works:  chmod u+r db/MongoDB/lib/ant-contrib-1.

0b3.jar

It appears that the permissions in your directory structure might be off. It is good practice to download, unzip, and use as one user.
Shahram.

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[Sumita Barahmand]

Hi,

1. Did your ant complete successfully?

2. I think the way you are setting the classpath is slightly incorrect. Can you try using ":" instead of ";". So you will have something like the following:

-cp build/bg.jar:db/MongoDB/lib/*

Sumita

[Sayat Satybaldiev]

Thank you for your replies! 

Yea, I've managed to fix this errors and sucessfully created the schema. The problem was that I need to give additional property the client and specifyt the schema: 

-p mongodb.database="local"

and write mongoDB url with lower characters like this: -p mongodb.url=127.0.0.1:27017

Wright now I have an issue with populating the schema with data. I use example from tutorial with following commands:

java -cp build/bg.jar:db/MongoDB/lib/* edu.usc.bg.base.Client -load -db  mongoDB.MongoDbClient -P /Users/sayatsatybaldiyev/Documents/Education/USC/CS685_Advanced_DB/software/BG/workloads/populateDB -p mongodb.url=127.0.0.1:27017 -p insertimage=true -p imagesize=2 -p threadcount=1 -p mongodb.database=local

And it gives Null Pointer Error:

*****max execution time specified : 0

BG Client: ThreadCount =1

Loading workload...

Connected

Creating the initial zipfian probabilities...

Sum of original probs = 0.9999999999999961

Initial Zipfian probabilities are created.

Done creating clusters.

ClusterId0, 10000

ZipfianMean=0.27 Usercount=10000 numMaxClusters=1; 20.0% of members have, 0.6207969279431967, initial probability.

ZipfianMean=0.27 Usercount=10000 numMaxClusters=1; 20.0% of members have, 0.6207969279431991 clustering(new)probability.

Time to create fragments :97 msecs

Done dividing users

java.lang.NullPointerException

Insertion failed. Make sure the appropriate data store schema was created.

[Sayat Satybaldiev]

it looks like that java client can't find the schema. I look inside mongo local schema. And it gives me following:

> show collections

manipulation

photos.chunks

photos.files

resources

startup_log

system.indexes

thumbnails.chunks

thumbnails.files

I don't see user collection. May it be that -schema flag created a wrong schema for me?

[pallav rustogi]

Hi Sayat,

Can you execute >show dbs 

and see if the local db is created.. And then >use local

then do a show collections.

For mongo you dont need to create a collection. As soon as you insert a data, it will create collection automatically. I think its giving you null pointer exception as you have not included  -p mongodb.writeConcern="normal" Property.

Regards

Pallav

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Thanks and Regards
Pallav Rustogi

"Every Little Thing you do will lead you to success one day"

[Sayat Satybaldiev]

Hi Pallav,

Yep, you got it right. Now everything is working properly. Thanks so much!

~Sayat

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