Uses a Twitter source, memory channel, and Avro sink in Apache Flume
to ingest Twitter data.
Flume is a distributed, reliable, and available service for efficiently
collecting, aggregating, and moving large amounts of log data. It has a simple
and flexible architecture based on streaming data flows. It is robust and fault
tolerant with tunable reliability mechanisms and many failover and recovery
mechanisms. It uses a simple extensible data model that allows for online
analytic application. Learn more at flume.apache.org.
This charm provides a Flume agent designed to process tweets from the Twitter
Streaming API and send them to the
apache-flume-hdfs agent for storage in
the shared filesystem (HDFS) of a connected Hadoop cluster. This leverages the
TwitterSource jar packaged with Flume. Learn more about the
The Twitter Streaming API requires developer credentials. You'll need to
configure those for this charm. Find your credentials (or create an account
if needed) here.
secret.yaml file with your Twitter developer credentials:
flume-twitter: twitter_access_token: 'YOUR_TOKEN' twitter_access_token_secret: 'YOUR_TOKEN_SECRET' twitter_consumer_key: 'YOUR_CONSUMER_KEY' twitter_consumer_secret: 'YOUR_CONSUMER_SECRET'
This charm leverages our pluggable Hadoop model with the
interface. This means that you will need to deploy a base Apache Hadoop cluster
to run Flume. The suggested deployment method is to use the
bundle. This will deploy the Apache Hadoop platform with a single Apache Flume
unit that communicates with the cluster by relating to the
apache-hadoop-plugin subordinate charm:
juju quickstart u/bigdata-dev/apache-ingestion-flume
Alternatively, you may manually deploy the recommended environment as follows:
juju deploy apache-hadoop-hdfs-master hdfs-master juju deploy apache-hadoop-yarn-master yarn-master juju deploy apache-hadoop-compute-slave compute-slave juju deploy apache-hadoop-plugin plugin juju deploy apache-flume-hdfs flume-hdfs juju add-relation yarn-master hdfs-master juju add-relation compute-slave yarn-master juju add-relation compute-slave hdfs-master juju add-relation plugin yarn-master juju add-relation plugin hdfs-master juju add-relation flume-hdfs plugin
Now that the base environment has been deployed (either via quickstart or
manually), you are ready to add the
apache-flume-twitter charm and
relate it to the
juju deploy apache-flume-twitter flume-twitter --config=secret.yaml juju add-relation flume-twitter flume-hdfs
That's it! Once the Flume agents start, tweets will start flowing into
HDFS via the
flume-hdfs charms. Flume may include
multiple events in each file written to HDFS. This is configurable with various
options on the
flume-hdfs charm. See descriptions of the
roll_* options on
the apache-flume-hdfs charm store
page for more details.
Flume will write files to HDFS in the following location:
subdirectory is configurable and set to
flume-twitter by default for this
Test the deployment
To verify this charm is working as intended, SSH to the
flume-hdfs unit and
locate an event:
juju ssh flume-hdfs/0 hdfs dfs -ls /user/flume/<event_dir> # <-- find a date hdfs dfs -ls /user/flume/<event_dir>/<yyyy-mm-dd> # <-- find an event
Since our tweets are serialized in
avro format, you'll need to copy the file
locally and use the
dfs -text command to view it:
hdfs dfs -copyToLocal /user/flume/<event_dir>/<yyyy-mm-dd>/FlumeData.<id>.avro /home/ubuntu/myFile.txt hdfs dfs -text file:///home/ubuntu/myFile.txt
You may not recognize the body of the tweet if it's not in a language you
understand (remember, this is a 1% firehose from tweets all over the world).
You may have to try a few different events before you find a tweet worth
reading. Happy hunting!
The maximum number of events the channel will take from a source or give to a sink per transaction.
Maximum number of milliseconds to wait before closing a batch
The HDFS subdirectory under /user/flume where events will be stored.
OAuth Access token from your Twitter developer account
OAuth Consumer key from your Twitter developer account
URL from which to fetch resources (e.g., Hadoop binaries) instead of Launchpad.
OAth Consumer secret from your Twitter developer account
The application to use for this Flume source. Deafult to TwitterSource bundled with Flume.
The maximum number of events stored in the channel.
Maximum number of twitter messages to put in a single batch
OAuth Access token secret from your Twitter developer account