Pat Patterson

Pat

Pat is StreamSets' Community Champion.An outgoing personality and self-described 'articulate techie', Pat is an accomplished international public speaker, presenting at events such as Dreamforce, JavaOne (both San Francisco and Tokyo), the RSA Conference, Defrag and more.

Ask StreamSets: Questions and Answers for the StreamSets Community

Ask StreamSetsIt's fair to say that most developers are familiar with Stack Overflow and the Stack Exchange network of question and answer sites. Q&A sites such as Stack Overflow serve communities of users focused around a particular topic or discipline – in the case of Stack Overflow, programming. Today, we're launching Ask StreamSets, a Q&A site for the StreamSets community.

Pat PattersonAsk StreamSets: Questions and Answers for the StreamSets Community
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Cache Salesforce Data in Redis with StreamSets Data Collector

Redis LogoRedis is an open-source, in-memory, NoSQL database implementing a networked key-value store with optional persistence to disk. Perhaps the most popular key-value database, Redis is widely used for caching web pages, sessions and other objects that require blazingly fast access – lookups are typically in the millisecond range.

At RedisConf 2017 I presented a session, Cache All The Things! Data Integration via Jedis (slides), looking at how the open source Jedis library provides a small, sane, easy to use Java interface to Redis, and how a StreamSets Data Collector (SDC) pipeline can read data from a platform such as Salesforce, write it to Redis via Jedis, and keep Redis up-to-date by subscribing for notifications of changes in Salesforce, writing new and updated data to Redis. In this blog entry, I'll describe how I built the SDC pipeline I showed during my session.

Pat PattersonCache Salesforce Data in Redis with StreamSets Data Collector
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Triggering Databricks Notebook Jobs from StreamSets Data Collector

S3 and DatabricksLast December, I covered Continuous Data Integration with StreamSets Data Collector and Spark Streaming on Databricks. In StreamSets Data Collector (SDC) version 2.5.0.0 we added the Spark Executor, allowing your pipelines to trigger a Spark application, running on Apache YARN or Databricks. I'm going to cover the latter in this blog post, showing you how to trigger a notebook job on Databricks from events in a pipeline, generating analyses and visualizations on demand.

Pat PattersonTriggering Databricks Notebook Jobs from StreamSets Data Collector
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Visualizing and Analyzing Salesforce Data with Neo4j

Cases in Neo4jGraph databases represent and store data in terms of nodes, edges and properties, allowing quick, easy retrieval of complex hierarchical structures that may be difficult to model in traditional relational databases. Neo4j is an open source graph database widely deployed in the community; in this blog entry I'll show you how to use StreamSets Data Collector (SDC) to read case data from Salesforce and load it into the graph database using Neo4j's JDBC driver.

Pat PattersonVisualizing and Analyzing Salesforce Data with Neo4j
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Calling External Libraries from the JavaScript Evaluator

JavaScript logoThe Script Evaluators in StreamSets Data Collector (SDC) allow you to manipulate data in pretty much any way you please. I've already written about how you can call external Java code from your scripts – compiled Java code has great performance, but sometimes the code you need isn't available in a JAR. Today I'll show you how to call an external JavaScript library from the JavaScript Evaluator.

Pat PattersonCalling External Libraries from the JavaScript Evaluator
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Quick Tip: Resolving ‘minReplication’ Hadoop FS Error

minReplication ErrorI run StreamSets Data Collector on my MacBook Pro. In fact, I have about a dozen different versions installed – the latest, greatest 2.5.0.0, older versions, release candidates, and, of course, a development ‘master' build that I hack on. Preparing for tonight's St Louis Hadoop User Group Meetup, I downloaded Cloudera's CDH 5.10 Quickstart VM so I could show our classic ‘Taxi Data Tutorial‘ and Drift Synchronization with Hadoop FS and Apache Hive. Spinning up the tutorial pipeline, I was surprised to see an error: HADOOPFS_13 - Error while writing to HDFS: com.streamsets.pipeline.api.StageException: HADOOPFS_58 - Flush failed on file: '/sdc/taxi/_tmp_sdc-847321ce-0acb-4574-8d2c-ff63529f25b8_0' due to 'org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /sdc/taxi/_tmp_sdc-847321ce-0acb-4574-8d2c-ff63529f25b8_0 could only be replicated to 0 nodes instead of minReplication (=1). There are 1 datanode(s) running and 1 node(s) are excluded in this operation. I'll explain what this means, and how to resolve it, in this blog post.

Pat PattersonQuick Tip: Resolving ‘minReplication’ Hadoop FS Error
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Create a Custom Expression Language Function for StreamSets Data Collector

Custom EL SnapshotOne of the most powerful features in StreamSets Data Collector (SDC) is support for Expression Language, or ‘EL' for short. EL was introduced in JavaServer Pages (JSP) 2.0 as a mechanism for accessing Java code from JSP. The Expression Evaluator and Stream Selector stages rely heavily on EL, but you can use EL in configuring almost every SDC stage. In this blog entry I'll explain a little about EL and show you how to write your own EL functions.

Pat PattersonCreate a Custom Expression Language Function for StreamSets Data Collector
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Creating a Custom Multithreaded Origin for StreamSets Data Collector

Multithreaded PipelineMultithreaded Pipelines, introduced a couple of releases back, in StreamSets Data Collector (SDC) 2.3.0.0, enable a single pipeline instance to process high volumes of data, taking full advantage of all available CPUs on the machine. In this blog entry I'll explain a little about how multithreaded pipelines work, and how you can implement your own multithreaded pipeline origin thanks to a new tutorial by Guglielmo Iozzia, Big Data Analytics Manager at Optum, part of UnitedHealth Group.

Pat PattersonCreating a Custom Multithreaded Origin for StreamSets Data Collector
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Making Sense of Stream Processing

StreamThere has been an explosion of innovation in open source stream processing over the past few years. Frameworks such as Apache Spark and Apache Storm give developers stream abstractions on which they can develop applications; Apache Beam provides an API abstraction, enabling developers to write code independent of the underlying framework, while tools such as Apache NiFi and StreamSets Data Collector provide a user interface abstraction, allowing data engineers to define data flows from high-level building blocks with little or no coding.

In this article, I'll propose a framework for organizing stream processing projects, and briefly describe each area. I’ll be focusing on organizing the projects into a conceptual model; there are many articles that compare the streaming frameworks for real-world applications – I list a few at the end.

Pat PattersonMaking Sense of Stream Processing
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Installing StreamSets Data Collector on Amazon Web Services EC2

Mike FullerMike Fuller, a consultant at Red Pill Analytics, recently wrote Stream Me Up (to the Cloud), Scotty, a tutorial on installing StreamSets Data Collector (SDC) on Amazon Web Services EC2. Mike's article takes you all the way from logging in to a fresh EC2 instance to seeing your first pipeline in action. We're reposting it here courtesy of Mike and Red Pill.

Pat PattersonInstalling StreamSets Data Collector on Amazon Web Services EC2
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