by Jeff Bean and Joanthan Hsieh
Apache HBase is a rapidly-evolving random-access distributed data store built on top of Apache Hadoop’s HDFS and Apache ZooKeeper. Drawing from real-world support experiences, this talk provides administrators insight into improving HBase’s availability and recovering from situations where HBase is not available. We share tips on the common root causes of unavailability, explain how to diagnose them, and prescribe measures for ensuring maximum availability of an HBase cluster. We discuss new features that improve recovery time such as distributed log splitting as well as supportability improvements. We will also describe utilities including new failure recovery tools that we have developed and contributed that can be used to diagnose and repair rare corruption problems on live HBase systems.
We use “SaasBase Analytics” to incrementally process large heterogeneous data sets into pre-aggregated, indexed views, stored in HBase to be queried in realtime. The requirement we started from was to get large amounts of data available in near realtime (minutes) to large amounts of users for large amounts of (different) queries that take milliseconds to execute. This set our problem apart from classical solutions such as Hive and PIG. In this talk I`ll go through the design of the solution and the strategies (and hacks) to achieve low latency and scalability from theoretical model to the entire process of ETL to warehousing and queries.
There are a number of excellent databases that have proven invaluable when working with `big data` – including Cassandra, Riak, DynamoDB, MongoDB, and HBase. So, how do you decide which is the right solution for you? This talk will start by briefly discussing some of the theory involved with distributed databases – from the oft-cited (and almost-as-often misunderstood) CAP theorem, to vector clocks and the difficulties of eventual consistency, and much more. We will then compare how mainstream distributed databases make use of these concepts, and the tradeoffs they incur. Unfortunately, due to the nature of these tradeoffs, there is no one-size-fits all solution. So, we`ll discuss what classes of problems each of these systems is appropriate for – and include some real world benchmarks – to help you make an informed decisions about your distributed systems.
by Bilung Lee and Kathleen Ting
Apache Sqoop (incubating) was created to efficiently transfer big data between Hadoop related systems (such as HDFS, Hive, and HBase) and structured data stores (such as relational databases, data warehouses, and NoSQL systems). The popularity of Sqoop in enterprise systems confirms that Sqoop does bulk transfer admirably. In the meantime, we have encountered many new challenges that have outgrown the abilities of the current infrastructure. To fulfill more data integration use cases as well as become easier to manage and operate, a new generation of Sqoop, also known as Sqoop 2, is currently undergoing development to address several key areas, including ease of use, ease of extension, and security. This session will talk about Sqoop 2 from both the development and operations perspectives.
by Alex Kozlov
Processing of large data requires new approaches to data mining: low, close to linear, complexity and stream processing. While in the traditional data mining the practitioner is usually presented with a static dataset, which might have just a timestamp attached to it, to infer a model for predicting future/takeout observations, in stream processing the problem is often posed as extracting as much information as possible on the current data to convert them to an actionable model within a limited time window. In this talk I present an approach based on HBase counters for mining over streams of data, which allows for massively distributed processing and data mining. I will consider overall design goals as well as HBase schema design dilemmas to speed up knowledge extraction process. I will also demo efficient implementations of Naive Bayes, Nearest Neighbor and Bayesian Learning on top of Bayesian Counters.
13th–14th June 2012