Productionizing H2O¶

(Note: This section is a work in progress.)

About POJOs and MOJOs¶

H2O allows you to convert the models you have built to either a Plain Old Java Object (POJO) or a Model ObJect, Optimized (MOJO).

H2O-generated MOJO and POJO models are intended to be easily embeddable in any Java environment. The only compilation and runtime dependency for a generated model is the h2o-genmodel.jar file produced as the build output of these packages. This file is a library that supports scoring. For POJOs, it contains the base classes from which the POJO is derived from. (You can see “extends GenModel” in a pojo class. The GenModel class is part of this library.) For MOJOs, it also contains the required readers and interpreters. The h2o-genmodel.jar file is required when POJO/MOJO models are deployed to production.

Users can refer to the following Quick Start files for more information about generating POJOs and MOJOs:

Notes:

MOJOs are supported for DRF, GBM, GLM, GLRM, K-Means, Word2vec, and XGBoost models only.
POJOs are not supported for XGBoost.

Developers can refer to the the POJO and MOJO Model Javadoc.

Example Design Patterns¶

Here is a collection of example design patterns for how to productionize H2O.

Consumer loan application¶

Characteristic	Value
Pattern name	Jetty servlet
Example training language	R
Example training data source	CSV file
Example scoring data source	User input to Javascript application running in browser
Scoring environment	REST API service provided by Jetty servlet
Scoring engine	H2O POJO
Scoring latency SLA	Real-time

Resource	Location
Git repos	https://github.com/h2oai/app-consumer-loan
Slides	http://docs.h2o.ai/h2o-tutorials/latest-stable/tutorials/building-a-smarter-application/index.html
Videos	http://library.fora.tv/2015/11/09/building_a_smart_application_hands_on_tom

Craigslist application¶

Characteristic	Value
Pattern name	Sparkling water streaming
Example training language	Scala
Example training data source	CSV file
Example scoring data source	User input to Javascript application running in browser
Scoring engine	H2O cluster
Scoring latency SLA	Real-time

Resource

Location

Git repos

https://github.com/h2oai/app-ask-craig

Blogs

http://blog.h2o.ai/2015/06/ask-craig-sparkling-water/

http://blog.h2o.ai/2015/07/ask-craig-sparkling-water-2/

Slides

http://www.slideshare.net/0xdata/sparkling-water-ask-craig

http://www.slideshare.net/0xdata/sparkling-water-applications-meetup-072115

Malicious domain application¶

Characteristic	Value
Pattern name	AWS Lambda
Example training language	Python
Example training data source	CSV file
Example scoring data source	User input to Javascript application running in browser
Scoring environment	AWS Lambda REST API endpoint
Scoring engine	H2O POJO
Scoring latency SLA	Real-time

Resource	Location
Git repos	https://github.com/h2oai/app-malicious-domains
Slides	https://github.com/h2oai/h2o-meetups/tree/master/2016_05_03_H2O_Open_Tour_Chicago_Application
Videos	http://library.fora.tv/2016/05/03/design_patterns_for_smart_applications_and_data_products

Storm bolt¶

Characteristic	Value
Pattern name	Storm bolt
Example training language	R
Example training data source	CSV file
Example scoring data source	Storm spout
Scoring environment	POJO embedded in a Storm bolt
Scoring engine	H2O POJO
Scoring latency SLA	Real-time

Resource	Location
Git repos	https://github.com/h2oai/h2o-tutorials/tree/master/tutorials/streaming/storm
Tutorials	http://docs.h2o.ai/h2o-tutorials/latest-stable/tutorials/streaming/storm/index.html

Invoking POJO directly in R¶

Characteristic	Value
Pattern name	POJO in R
Example training language	R
Example training data source	(Need example)
Example scoring data source	(Need example)
Scoring environment	R
Scoring engine	H2O POJO
Scoring latency SLA	Batch

Hive UDF¶

Characteristic	Value
Pattern name	Hive UDF
Example training language	R
Example training data source	HDFS directory with hive part files output by a SELECT
Example scoring data source	Hive
Scoring environment	Hive SELECT query (parallel MapReduce) running UDF
Scoring engine	H2O POJO
Scoring latency SLA	Batch

Resource	Location
Git repos	https://github.com/h2oai/h2o-tutorials/tree/master/tutorials/hive_udf_template
Tutorials	http://docs.h2o.ai/h2o-tutorials/latest-stable/tutorials/hive_udf_template/index.html

MOJO as a JAR Resource¶

Characteristic	Value
Pattern name	MOJO JAR
Example training language	R
Example training data source	Iris
Example scoring data source	Single Row
Scoring environment	Portable
Scoring engine	H2O MOJO
Scoring latency SLA	Real-time example, but can be adapted (use in Hive UDF etc.)

Resource	Location
Git repos	https://github.com/h2oai/h2o-tutorials/tree/master/tutorials/mojo-resource

Steam Scoring Server from H2O.ai¶

Characteristic	Value
Pattern name	Steam
Scoring data source	REST API client
Scoring environment	Steam scoring server
Scoring engine	H2O POJO
Scoring latency SLA	Real-time

Resource	Location
Web sites	http://www.h2o.ai/steam/