A Touch of Azure in Your KNIME Workflow
A Touch of Azure in Your KNIME Workflow
Learn from this article about the new integration of KNIME along with Microsoft Azure. Practice the hands on example to get started with KNIME.
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The latest release of KNIME Analytics Platform 3.4 has produced many new features, nodes, integrations, and example workflows. This is all to give you a better all-round experience in data science, enterprise operations, usability, learning, and scalability.
When we talk about scalability, the cloud often comes to mind. When we talk about the cloud, Microsoft Azure often comes to mind. That is the reason why KNIME has been integrating some of the Azure products and services.
The novelty of this latest release consists of the example material. If you currently access (or want to access in the future) some Microsoft products, on the cloud, in your KNIME workflow, you can start by having a look at the 11_Partners/01_Microsoft folder in the EXAMPLES server and at this link on the KNIME Node Guide.
A little note for the neophytes among us. The KNIME EXAMPLES server is a public KNIME server hosting a constantly growing number of example workflows (see YouTube video “KNIME EXAMPLES Server”). If you are new to a topic, let’s say “churn prediction,” and you are looking for a quick starting point, then you could access the EXAMPLES server in the top left corner inside the KNIME workbench, download the example workflow in 50_Applications/18_Churn_Prediction (50_Applications/18_Churn_Prediction/01_Training_a_Churn_Predictor), and update it to your data and specific business problem. It is very easy and one of the most loved features in the KNIME Analytics Platform.
A special section (11_Partners/01_Microsoft) on the EXAMPLES server is dedicated to access and use Microsoft products. Let’s see now what we find in there!
Figure 1. Five tutorial workflows on Microsoft products available for download on the KNIME EXAMPLES Server and released in July 2017 with KNIME Analytics Platform 3.4. These tutorial workflows show how to access MS SQL Server, HDInsight Hive, and BlobStorage and how to run SQL queries for In-Database processing, train models using the HDInsight Spark ML library, and generically execute Microsoft R code.
- MS SQL Server. The first example workflow in the folder.(11_Partners/01_Microsoft/01_SQL_Server_InDB_Processing(Azure)) shows how to run a few in-database operations on a MS SQL Server. Connection to the database happens through a dedicated connector node, named SQL Server Connector. In-database processing operations are implemented via dedicated SQL nodes, using a GUI in their configuration window, or via a SQL Query node for free SQL code.
Note. The SQL Server Connector node would connect equally well to Microsoft DW as it does to MS SQL Server, provided that the right JDBC driver is installed. So this example workflow actually works for SQL Server and DW at the same time.
- BlobStorage. The second example workflow. (11_Partners/01_Microsoft/02_SQLServer_BlobStorage_andKNIMEModels) offers a data blending example. It takes data from MS SQL Server, like in the first example workflow above, and data from BlobStorage. The Azure BlobStore Connection node connects to a BlobStorage installation on the Azure cloud, the Azure BlobStore File Picker node allows for exploration of the BlobStorage repository and for the selection of one file. The full file path is then passed via flow variable to a more classic File Reader node.
Figure 2. Tutorial workflow 02.SQLServer_BlobStorage_and KNIMEModels shows how to connect to Azure BlobStorage data repository
- HDInsight Hive. Example workflow 11_Partners/01_Microsoft/03_HDI_Hive_KNIME accesses Hive in an Azure HDInsight installation. Similarly to the SQL Server example, here a Hive Connector, a dedicated connector, connects to the Hive database and a number of In-database processing nodes prepares the data to train a Decision Tree Learner node, which is a KNIME native node.
- HDInsight Spark. 11_Partners/01_Microsoft/04_HDI_Hive_Spark conceptually implements exactly the same workflow as in 03.HDI_Hive_KNIME, but here the mix and match effect is obtained by inserting Spark based model training nodes rather than KNIME native nodes. Data transfer from Hive to Spark and RDD creation happen through the Hive To Spark nodes. Transfer data operations and RDD creation can also happen through a variety of other nodes available, like Database to Spark, JSON To Spark, and Parquet To Spark. In this example, we also train a Spark Decision Tree. Many more data mining algorithms are available from the Spark Machine Learning library. Just type “Spark” in the search box above the Node Repository to fully explore the KNIME Spark integration.
Figure 3. Tutorial workflow 04.HDI_Hive_Spark shows the Hive Connector node, a dedicated connector to Hive access, and a number of Spark based nodes to run Machine Learning algorithms on a HDINsight Spark platform.
- Microsoft R. We have reached the last example workflow (11_Partners/01_Microsoft/05_Predict_DepartureDelays_with_MicrosoftR) of the batch produced with the latest release of KNIME Analytics Platform 3.4. The KNIME R integration fully supports Microsoft R. It provides a full set of nodes to write R scripts, train and/or apply R models, and produce R graphs. It is sufficient to set the pointer of the R executable to a Microsoft R installation in the KNIME Preferences page. The following video explains step by step how to configure and use the Microsoft R integration within KNIME Analytics Platform.
Video 1. YouTube tutorial video on the KNIME Microsoft R integration.
The 05.Predict_DepartureDelays_with_MicrosoftR workflow trains a model to predict whether a flight will be delayed at departure when leaving from ORD airport. It shows this same operation 3 times.
- “Pure Microsoft R” uses only R code written in the R Snippet node.
- “Hybrid Microsoft R & KNIME” mixes R code based nodes with KNIME GUI based nodes.
- “Pure KNIME Analytics Platform” runs the whole procedure again using only KNIME nodes.
Indeed, not all data scientists are created equally R experts. For the R coding wizards, the standalone implementation using the R Snippet node as R editor is probably what they prefer. However, for the other less R experts, the other two implementations might be more suitable. Indeed, breaking up R code in smaller easier pieces and mixing and matching with KNIME nodes, might make the whole R coding experience more pleasant for most of us.
Figure 4. Tutorial workflow 05_Predict_DepartureDelays_with_MicrosoftR trains a model on the airline dataset in 3 ways. Purely using an R script; mixing and matching R code segments and KNIME nodes; purely using KNIME nodes.
With the ease of use and the extensive coverage of data science algorithms of KNIME Analytics Platform, with the collaboration and production features of the KNIME Server, with the versatility of the Azure platform, with the completeness of the Microsoft data repository offer, the work of a data scientist can become quicker, more efficient, and ultimately more productive.
Published at DZone with permission of Rosaria Silipo , DZone MVB. See the original article here.
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