Cloudera Engineering Blog · CDH Posts
These new Apache HBase features in CDH 5.2 make multi-tenant environments easier to manage.
Historically, Apache HBase treats all tables, users, and workloads with equal weight. This approach is sufficient for a single workload, but when multiple users and multiple workloads were applied on the same cluster or table, conflicts can arise. Fortunately, starting with HBase in CDH 5.2 (HBase 0.98 + backports), workloads and users can now be prioritized.
A significant vulnerability affecting the entire Apache Hadoop ecosystem has now been patched. What was involved?
By now, you may have heard about the POODLE (Padding Oracle On Downgraded Legacy Encryption) attack on TLS (Transport Layer Security). This attack combines a cryptographic flaw in the obsolete SSLv3 protocol with the ability of an attacker to downgrade TLS connections to use that protocol. The result is that an active attacker on the same network as the victim can potentially decrypt parts of an otherwise encrypted channel. The only immediately workable fix has been to disable the SSLv3 protocol entirely.
Installing CDH on newer unsupported operating systems (such as Ubuntu 13.04 and later) can lead to conflicts. These guidelines will help you avoid them.
Some of the more recently released operating systems that bundle portions of the Apache Hadoop stack in their respective distro repositories can conflict with software from Cloudera repositories. Consequently, when you set up CDH for installation on such an OS, you may end up picking up packages with the same name from the OS’s distribution instead of Cloudera’s distribution. Package installation may succeed, but using the installed packages may lead to unforeseen errors.
Our thanks to Micah Whitacre, a senior software architect on Cerner Corp.’s Big Data Platforms team, for the post below about Cerner’s use case for CDH + Apache Kafka. (Kafka integration with CDH is currently incubating in Cloudera Labs.)
Over the years, Cerner Corp., a leading Healthcare IT provider, has utilized several of the core technologies available in CDH, Cloudera’s software platform containing Apache Hadoop and related projects—including HDFS, Apache HBase, Apache Crunch, Apache Hive, and Apache Oozie. Building upon those technologies, we have been able to architect solutions to handle our diverse ingestion and processing requirements.
Thanks to new improvements in Hue, CDH 5.2 offers the best GUI yet for using Hadoop.
CDH 5.2 includes important new usability functionality via Hue, the open source GUI that makes Apache Hadoop easy to use. In addition to shipping a brand-new app for managing security permissions, this release is particularly feature-packed, and is becoming a great complement to BI tools from Cloudera partners like Tableau, MicroStrategy, and Zoomdata because a more usable Hadoop translates into better BI overall across your organization!
Impala authentication can now be handled by a combination of LDAP and Kerberos. Here’s why, and how.
Impala, the open source analytic database for Apache Hadoop, supports authentication—the act of proving you are who you say you are—using both Kerberos and LDAP. Kerberos has been supported since release 1.0, LDAP support was added more recently, and with CDH 5.2, you can use both at the same time.
This new feature, jointly developed by Cloudera and Intel engineers, makes management of role-based security much easier in Apache Hive, Impala, and Hue.
Apache Sentry (incubating) provides centralized authorization for services and applications in the Apache Hadoop ecosystem, allowing administrators to set up granular, role-based protection on resources, and to review them in one place. Previously, Sentry only designated administrators to
REVOKE privileges on an authorizable object. In Apache Sentry 1.5.0 (shipping inside CDH 5.2), we have implemented a new feature (SENTRY-327) that allows admin users to delegate the
GRANT privilege to other users using
WITH GRANT OPTION. If a user has the
GRANT OPTION privilege on a specific resource, the user can now grant the
GRANT privilege to other users on the same resource. Apache Hive, Impala, and Hue have all been updated to take advantage of this new Sentry functionality.
Impala 2.0 is the most SQL-complete/SQL-compatible release yet.
As we reported in the most recent roadmap update (“What’s Next for Impala: Focus on Advanced SQL Functionality”), more complete SQL functionality (and better SQL compatibility with other vendor extensions) is a major theme in Impala 2.0.
Cloudera Labs contains ecosystem innovations that one day may bring developers more functionality or productivity in CDH.
Since its inception, one of the defining characteristics of Apache Hadoop has been its ability to evolve/reinvent and thrive at the same time. For example, two years ago, nobody could have predicted that the formative MapReduce engine, one of the cornerstones of “original” Hadoop, would be marginalized or even replaced. Yet today, that appears to be happening via Apache Spark, with Hadoop becoming the stronger for it. Similarly, we’ve seen other relatively new components, like Impala, Apache Parquet (incubating), and Apache Sentry (also incubating), become widely adopted in relatively short order.
Cloudera Enterprise 5.2 contains new functionality for security, cloud deployments, and real-time architectures, and support for the latest open source component releases and partner technologies.
We’re pleased to announce the release of Cloudera Enterprise 5.2 (comprising CDH 5.2, Cloudera Manager 5.2, Cloudera Director 1.0, and Cloudera Navigator 2.1).