Running the topology – the Redis case

We have a few more small things to address before we run the topology:

1. Copy the logconfig.ini file from the second example in Chapter 3, Introducing Petrel, to this topology's directory.

2. Create a file called setup.sh. Petrel will package this script with the topology and run it at startup. This script installs the third-party Python libraries used by the topology. The file looks like this:

   pip install -U pip
   pip install nltk==3.0.1 oauthlib==0.7.2
   tweepy==3.2.0

3. Create a file called manifest.txt with these two lines:

   logconfig.ini
   setup.sh

4. Install the Redis server on a well-known node. All workers will store state here:

            sudo apt-get install redis-server

5. Install the Python Redis client on all Storm worker machines:

            sudo apt-get install python-redis

6. Before running the topology, let's review the list of files that we've created. Make sure you have created these files correctly:

   • topology.yaml

   • twitterstream.py

   • splitsentence.py

   • rollingcount.py

   • totalrankings...