This charm will run a simple Sentiment Analysis in a Spark Streaming Cluster.
Spark Sample Project
This is a set of projects for demonstrating and testing an architecture mixing Kafka, Hadoop, Spark, Redis and node.js by performing Twitter sentiment analysis.
How to use this project?
This project contains a simple Spark App as described on ZData blog.
In order to use it, you will need
- Access to the Twitter Streaming API: using your credentials, connect to twitter and create an application to obtain credentials.
- A Kafka Cluster (>0.8): Kafka will be used to connect to Twitter, consume the stream and make it available for the Kafka Spout.
- A Spark Cluster: The cluster shall have more than 4 worker nodes.
- A node.js server, which can be hosted separately or on the same machine. This will be used to collect the analyzed tweets and display their analysis.
The source website mentions it uses a CentOS machine with virtual machines and containers but doesn't provide a simple way to consume the "tutorial". This simple project aims at providing a comprehensive deployment to enjoy Twitter Sentiment Analysis running with Ubuntu.
Well obviously zdatainc does something with this project but on the Canonical side, the maintainer will be Samuel Cozannet email@example.com
Preferred deployment method
This project should be consumed via Juju through the deployment of a bundle.
The below instruction will however explain how to use it in a non automated environment
Running the project
Starting all elements
- Start the Kafka Server (Broker)
See the related project for more information. To start it manually you can do:
:~# cd /opt/kafka :~# ./bin/kafka-server-start.sh /opt/kafka/config/server.properties
<That makes sure you have a broker ready to welcome the stream of data from Twitter.
The lines of log should end like:
root@kafka-0:/opt/kafka# ./bin/kafka-server-start.sh /opt/kafka/config/server.properties [2014-10-20 07:55:59,468] INFO zookeeper state changed (SyncConnected) (org.I0Itec.zkclient.ZkClient) [2014-10-20 07:56:00,287] INFO Found clean shutdown file. Skipping recovery for all logs in data directory '/tmp/kafka-logs' (kafka.log.LogManager) [2014-10-20 07:56:00,289] INFO Loading log 'twitter.live-1' (kafka.log.LogManager) [2014-10-20 07:56:00,394] INFO Completed load of log twitter.live-1 with log end offset 369524 (kafka.log.Log) SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. [2014-10-20 07:56:00,475] INFO Loading log 'twitter.live-0' (kafka.log.LogManager) [2014-10-20 07:56:00,481] INFO Completed load of log twitter.live-0 with log end offset 647391 (kafka.log.Log) [2014-10-20 07:56:00,483] INFO Starting log cleanup with a period of 60000 ms. (kafka.log.LogManager) [2014-10-20 07:56:00,489] INFO Starting log flusher with a default period of 9223372036854775807 ms. (kafka.log.LogManager) [2014-10-20 07:56:00,543] INFO Awaiting socket connections on 0.0.0.0:9092. (kafka.network.Acceptor) [2014-10-20 07:56:00,544] INFO [Socket Server on Broker 0], Started (kafka.network.SocketServer) [2014-10-20 07:56:00,827] INFO Will not load MX4J, mx4j-tools.jar is not in the classpath (kafka.utils.Mx4jLoader$) [2014-10-20 07:56:00,887] INFO 0 successfully elected as leader (kafka.server.ZookeeperLeaderElector) [2014-10-20 07:56:01,614] INFO Registered broker 0 at path /brokers/ids/0 with address ip-1XXXXXXXXXXXXXX-compute.internal:9092. (kafka.utils.ZkUtils$) [2014-10-20 07:56:01,691] INFO New leader is 0 (kafka.server.ZookeeperLeaderElector$LeaderChangeListener) [2014-10-20 07:56:01,758] INFO [Kafka Server 0], started (kafka.server.KafkaServer) [2014-10-20 07:56:02,792] INFO [ReplicaFetcherManager on broker 0] Removed fetcher for partitions [twitter.live,0],[twitter.live,1] (kafka.server.ReplicaFetcherManager) [2014-10-20 07:56:03,255] INFO [ReplicaFetcherManager on broker 0] Removed fetcher for partitions [twitter.live,0],[twitter.live,1] (kafka.server.ReplicaFetcherManager)
1.2. As a service
Assuming this was deployed with Juju, Kafka would be a daemon started automatically:
root@kafka-0:~# service kafka <start | stop | restart>
Note this require your Zookeeper cluster to be up & running.
- Start the Kafka Producer
In the Kafka language, Producer means your "data source collection hub". It's the primary Kafka node that connects to your raw data source, in our case a Twitter Streaming API feed.
For this we use an old version of https://github.com/NFLabs/kafka-twitter.git which we refactored a little bit (see https://github.com/SaMnCo/charm-kafka-twitter)
See the related project for more information but assuming this was deployed with Juju on the same node as you Kafka Server, you can start it in command line with
:~# cd /opt/kafka-twitter :~# ./gradlew run -Pargs="/opt/kafka-twitter/conf/producer.conf"
At some point you will then see a [75% - run] notification, and lines mentionning you are connected to Twitter.
The output should then be:
root@kafka-0:/opt/kafka-twitter# ./gradlew run -Pargs="/opt/kafka-twitter/conf/producer.conf" :compileJava UP-TO-DATE :processResources UP-TO-DATE :classes UP-TO-DATE :run log4j:WARN No appenders could be found for logger (kafka.utils.VerifiableProperties). log4j:WARN Please initialize the log4j system properly. 5854 [Twitter Stream consumer-1[initializing]] INFO twitter4j.TwitterStreamImpl - Establishing connection. 12963 [Twitter Stream consumer-1[Establishing connection]] INFO twitter4j.TwitterStreamImpl - Connection established. 12963 [Twitter Stream consumer-1[Establishing connection]] INFO twitter4j.TwitterStreamImpl - Receiving status stream. > Building 75% > :run
2.2. As a service
In the latest version of the project this has been converted to a service which you can start with
root@kafka-0:~# service kafka-twitter <start | stop | restart>
This require a Kafka Broker to be running, but it doesn't have to be on the same node.
If you want to check if it really works, Kafka hosts a log of what it does in /tmp
ubuntu@kafka-0:~$ ls -la /tmp/kafka-logs/twitter.live-0/ total 2260880 drwxr-xr-x 2 root root 4096 Oct 16 14:50 . drwxr-xr-x 4 root root 4096 Oct 20 08:01 .. -rw-r--r-- 1 root root 734256 Oct 20 08:01 00000000000000000000.index -rw-r--r-- 1 root root 536871014 Oct 15 15:00 00000000000000000000.log -rw-r--r-- 1 root root 728016 Oct 20 08:01 00000000000000151393.index -rw-r--r-- 1 root root 536871292 Oct 16 12:16 00000000000000151393.log -rw-r--r-- 1 root root 732488 Oct 20 08:01 00000000000000302151.index -rw-r--r-- 1 root root 536877126 Oct 16 14:00 00000000000000302151.log -rw-r--r-- 1 root root 732600 Oct 20 08:01 00000000000000454244.index -rw-r--r-- 1 root root 536874264 Oct 16 14:50 00000000000000454244.log -rw-r--r-- 1 root root 224728 Oct 20 08:01 00000000000000605240.index -rw-r--r-- 1 root root 164450494 Oct 20 08:01 00000000000000605240.log
As you can see, each log batch is 512MB then it gets rotated. However the old logs are kept so beware of the disk beast. You can change that in the Kafka Configuration. (see the kafka-twitter project)
- Start the Spark Application and grep for the output
3.2 As a service
Editing the code
Troubleshooting / FAQ
Including Java version
At first run, Maven would not compile because of a Java versioning problem. This was fixed by adding
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin>
to the original pom.xml.
Failure after a few days
ZooKeeper nodes tend to fail after a few days if nothing is done. This is because ZK keeps logging information for ever and doesn't cleanup logs by default. This behavior can be changed by adding this to the crontab:
0 0 * * * /usr/lib/zookeeper/bin/zkCleanup.sh -n 3
Then restart the Cron service.
root@hdp-zookeper:~$# service cron restart
The code in this project is made available as free and open source software
under the terms and conditions of the GNU Public License. For more information,
please refer to the LICENSE text file included with this project, or visit
gnu.org if the license file was not included.