Cloudera Engineering Blog · HDFS Posts

What Do Real-Life Apache Hadoop Workloads Look Like?

Organizations in diverse industries have adopted Apache Hadoop-based systems for large-scale data processing. As a leading force in Hadoop development with customers in half of the Fortune 50 companies, Cloudera is in a unique position to characterize and compare real-life Hadoop workloads. Such insights are essential as developers, data scientists, and decision makers reflect on current use cases to anticipate technology trends.

Recently we collaborated with researchers at UC Berkeley to collect and analyze a set of Hadoop traces. These traces come from Cloudera customers in e-commerce, telecommunications, media, and retail (Table 1). Here I will explain a subset of the observations, and the thoughts they triggered about challenges and opportunities in the Hadoop ecosystem, both present and in the future.

Meet the Engineer: Aaron T. Myers

Aaron T. Myers

As I mentioned in my inaugural post last week, it’s important to shine a spotlight on the Cloudera engineers who have a hand in making the Hadoop projects run. It’s an obvious point, and yet an overlooked one, that a community is an aggregation of individual personalities who have diverse backgrounds and interests yet a shared passion for the group and its goals. As Jono Bacon puts it in his seminal 2009 book The Art of Community, “The building blocks of a community are its teams, and the material that makes these blocks are people.”

Cloudera Software Engineer Eli Collins on Apache Hadoop and CDH4

In June 2012, Eli Collins (@elicollins), from Cloudera’s Platforms team, led a session at QCon New York 2012 on the subject “Introducing Apache Hadoop: The Modern Data Operating System.” During the conference, the QCon team had an opportunity to interview Eli about several topics, including important things to know about CDH4, main differences between MapReduce 1.0 and 2.0, Hadoop use cases, and more. It’s a great primer for people who are relatively new to Hadoop.

You can catch the full interview (video and transcript versions) here.

CDH3 update 5 is now available

We are happy to announce the general availability of CDH3 update 5. This update is a maintenance release of CDH3 platform and provides a considerable amount of bug-fixes and stability enhancements. Alongside these fixes, we have also included a few new features, most notable of which are the following:

HttpFS for CDH3 – The Apache Hadoop FileSystem over HTTP

HttpFS is an HTTP gateway/proxy for Apache Hadoop FileSystem implementations. HttpFS comes with CDH4 and replaces HdfsProxy (which only provided read access). Its REST API is compatible with WebHDFS (which is included in CDH4 and the upcoming CDH3u5).

HttpFs is a proxy so, unlike WebHDFS, it does not require clients be able to access every machine in the cluster. This allows clients to to access a cluster that is behind a firewall via the WebHDFS REST API. HttpFS also allows clients to access CDH3u4 clusters via the WebHDFS REST API.

NameNode Recovery Tools for the Hadoop Distributed File System

Warning: The procedure described below can cause data loss. Contact Cloudera Support before attempting it.

Most system administrators have had to deal with a bad hard disk at some point. One moment, the hard disk is a mechanical marvel; the next, it is an expensive paperweight.

Meet the Presenters: Aaron Myers from Cloudera and Suresh Srinivas from Hortonworks

This was originally posted on the Hadoop Summit 2012 blog.

Today’s “Meet the Presenters” interview features two speakers: Aaron Myers from Cloudera and Suresh Srinivas from Hortonworks. Aaron and Suresh will be presenting on HDFS NameNode High Availability, one of the hottest topics in the Apache Hadoop space today.

Question: Tell us about your current role and how you interact with Apache Hadoop?

High Availability for the Hadoop Distributed File System (HDFS)


Apache Hadoop consists of two primary components: HDFS and MapReduce. HDFS, the Hadoop Distributed File System, is the primary storage system of Hadoop, and is responsible for storing and serving all data stored in Hadoop. MapReduce is a distributed processing framework designed to operate on data stored in HDFS.

HDFS has long been considered a highly reliable file system.  An empirical study done at Yahoo! concluded that across Yahoo!’s 20,000 nodes running Apache Hadoop in 10 different clusters in 2009, HDFS lost only 650 blocks out of 329 million total blocks. The vast majority of these lost blocks were due to a handful of bugs which have long since been fixed.

Apache Hadoop for Archiving Email – Part 2

Part 1 of this post covered how to convert and store email messages for archival purposes using Apache Hadoop, and outlined how to perform a rudimentary search through those archives. But, let’s face it: for search to be of any real value, you need robust features and a fast response time. To accomplish this we use Solr/Lucene-type indexing capabilities on top of HDFS and MapReduce.

Before getting into indexing within Hadoop, let us review the features of Lucene and Solr:

Apache Lucene and Apache Solr

Hadoop World 2011: A Glimpse into Development

The Development track at Hadoop World is a technical deep dive dedicated to discussion about Apache Hadoop and application development for Apache Hadoop. You will hear committers, contributors and expert users from various Hadoop projects discuss the finer points of building applications with Hadoop and the related ecosystem. The sessions will touch on foundational topics such as HDFS, HBase, Pig, Hive, Flume and other related technologies. In addition, speakers will address key development areas including tools, performance, bringing the stack together and testing the stack. Sessions in this track are for developers of all levels who want to learn more about upcoming features and enhancements, new tools, advanced techniques and best practices.

Preview of Development Track Sessions

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