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Twitter Graph Dataset

The dataset consists of the user-follower pairs (separated with the tab key).

Excercises

1. Find the user with the Maximun number of followers

Solution

The following table contains the top five users with greatest number of followers

+--------+-------+
|    user|  count|
+--------+-------+
|19058681|2997469|
|15846407|2679639|
|16409683|2674874|
|  428333|2450749|
|19397785|1994926|
+--------+-------+

The code for the solution is in 'src/main/scala/UserWithMaxFollowers.scala'

Run the code

Create the .JAR files.

Activate the sbt (Scala Build Tool) in a docker container with the following command:

docker run -it --rm -v $PWD:/wd -w /wd mozilla/sbt sbt shell

and run the package command in the sbt-shell.

Spark-submit

The following code calls UserWithMaxFollowers in the .jar file, stores the result in out/result and the log-info in out/info. Also, the time total execution time is stored in out/time

/usr/bin/time -o out/time -f '\t%E ' \
docker run -v $PWD:/wd -w /wd openjdk:8 \
spark-3.0.0-bin-hadoop2.7/bin/spark-submit \
--class "UserWithMaxFollowers" \
--master "local[*]" \
target/scala-2.12/twittergraph_2.12-0.1.0-SNAPSHOT.jar \
data/twitter_rv_sample.net \
2> out/info 1> out/result &

The job is run with the spark-submit command in the directory spark-3.0.0-bin-hadoop2.7 of the spark application. This directory is not in the repo and must be downloaded from the Spark's site. The jar file expects the data file as an argument.

Author

Enrique Jimenez