Cask Tracker Application

Introduction

The Cask™ Data Application Platform (CDAP) is an integrated, open source application development platform for the Hadoop ecosystem that provides developers with data and application abstractions to simplify and accelerate application development.

Tracker

Cask Tracker is one such application built by the team at Cask that provides the ability to track data ingested either through Cask Hydrator or through a custom CDAP application and provide input to data governance processes on a cluster. It includes this data about "the data":

• Metadata
  • Tags, properties, and schema for CDAP datasets and programs
  • System and user scopes
• Data Quality
  • Metadata including feed-level and field-level quality metrics of datasets
• Data Usage Statistics
  • Usage statistics of both datasets and programs

Getting Started

Prerequisites

To use the 0.3.0 version of Tracker, you must have CDAP version 4.0.x or higher.

Audit Publishing to Kafka

The Tracker App contains a flow that subscribes to the TMS (Transactional Messaging System, a component of CDAP) topic to which CDAP publishes the audit updates. Before using this application, you should enable publishing of audit updates to TMS by setting the audit.enabled option in your cdap-site.xml to true.

Building Cask Tracker

Build the Tracker directly from the latest source code by downloading and compiling:

git clone https://github.com/caskdata/cask-tracker.git
cd cask-tracker
mvn clean package

After the build completes, you will have a JAR in the ./target/ directory.

You can build without running tests using mvn clean package -DskipTests

Deploying Cask Tracker

Step 1: Using the CDAP CLI, deploy the plugin:

> load artifact target/tracker-<version>.jar

Step 2: Create an application configuration file based on the instructions below.

Step 3: Create a CDAP application using the configuration file:

> create app TrackerApp tracker <version> USER appconfig.txt

Application Configuration File

Create an application configuration file that contains the ZooKeeper quorum (not required in CDAP Standalone mode).

Sample configuration file:

{
  "config": {
    "auditLogConfig": {
      "zookeeperString": "hostname:2181/cdap"
    }
  }
}

Audit Log Config:

This key contains a property map with:

Required Properties:

• zookeeperString: ZooKeeper quorum string that is used by CDAP (required only in CDAP Distributed mode)

Optional Properties:

• topic: TMS Topic to which CDAP audit updates are published; default is audit which corresponds to the default topic used in CDAP for audit log updates
• numPartitions: Number of Kafka partitions; default is set to 10
• offsetDataset: Name of the dataset where TMS offsets are stored; default is _auditOffset
• limit: Number of TMS audit messages to read in batch

Mailing Lists

CDAP User Group and Development Discussions:

• [email protected]

The cdap-user mailing list is primarily for users using the product to develop applications or building plugins for appplications. You can expect questions from users, release announcements, and any other discussions that we think will be helpful to the users.

IRC Channel

CDAP IRC Channel: #cdap on irc.freenode.net

License and Trademarks

Copyright © 2016 Cask Data, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Cask is a trademark of Cask Data, Inc. All rights reserved.