Latest News & Updates

Driven acquired by Xplenty. What does this mean for Cascading?

Cascading 3.2.0 Released

Cascading 3.2.0 has been released.

This release covers the following issues and improvements:

– Much improved planner support for complex and tight c.p.Pipe assemblies that arise when merging files with themselves, or other split and joins with no intermediate operations.

– c.t.h.DistCacheTap is now applied by default to any accumulated side of a HashJoin by rule.

– Added a c.f.h.MultiMapReduceFlow that can manage executing multiple JobConf instances as a single c.f.Flow.

For a detailed list of changes in this release, see:

It can be downloaded here:

The source can be found here:

Cascading 3.1 Release

We are happy to announce Cascading 3.1 is now publicly available for download.

Version 3.1 improves the performance of Cascading over 3.0, resolves a number of issues during planning of complex workloads when running on MapReduce and Apache Tez, and further delivers on the promise of new platform portability with the addition of Apache Flink as an execution platform.

As of version 3.1, Cascading can further leverage declared type information during serialization of data across the ‘shuffle’ (partitioning phase) between map and reduce tasks or Tez vertices. For many applications, performing ETL or data cleansing type workloads, having flexible type support within a column can dramatically improve reliability by having operation request values as the types they require (a string or an integer). When integrating complex data sets, a given column or field may not be consistent across data sets, so requiring a common type instead of a means to lazily convert value on demand can be difficult to rely on in practice. But for applications and systems that are consistent, declaring types not only enforce consistency (or prevent inconsistency), the type information is now used to improve serialization IO efficiency.

In addition to leveraging additional type information, applications consuming data from directory partitioned data sets (data stored by date or other values) can be pre-filtered using a new filtering mechanism introduced in 3.1. For example, if a data set spans 10 years and is partitioned by year, and month, a filter can be used to prevent a Cascading application from reading files that are not within the expected time range during runtime by excluding partitions (directories) that do not match the filter. This simple enhancement allows applications to have greater performance without impacting the maintainability of large complex applications.

We are also very happy to remind users of the availability of Cascading on Apache Flink, with the release of 3.1.0, the Cascading Connector on Flink can be run against a stable Cascading release. For more information, see this Apache Conference presentation Faster Workflows.

Please note this is a minor release retaining API compatibility with Cascading 3.0 public methods.

As we continue to advance the code base, a number of other enhancements and bug fixes are included in the release. For the complete list of changes in Cascading 3.1, please see the change log.

Announcing Cascading 3.0 on Apache Flink

Thanks to our partners, data Artisans, Cascading users now have an additional compute fabric to execute Cascading 3.0 applications on, Apache Flink.

From the project site..

“Apache Flink is a platform for scalable stream and batch processing. Flink’s execution engine features low-latency pipelined and scalable batched data transfers and high-performance, in-memory operators for sorting and joining that gracefully go out-of-core in case of scarce memory resources.

Apache Flink uses in-memory storage to achieve massive performance gains over MapReduce. It’s active memory management and custom serialization stack enables highly efficient operations on binary data and effectively prevents JVM OutOfMemoryErrors as well as frequent Garbage Collection pauses. Memory-safe execution means very little parameter tuning is necessary to reliably execute Cascading programs on Flink.”

According to data Artisans, with virtually no code changes, Cascading 3.0 applications will run in Apache Flink, furthering the portability promise of Cascading through their contribution.

We are very excited to see another alternative for high performance production deployments made available to our community.

Link to Source code:
Data Artisans blog:


Cascading Newsletter - September 2015

September 2015 Newsletter

Cascading 3.0 Maintenance Release

We have just published Cascading 3.0.2, a minor maintenance release.  Upgrading is recommended for all users.

This release resolves the following issues:

  • Updated Apache Tez to 0.6.2 to prevent deadlocks in complex DAGs. Note this release is incompatible with Tez 0.6.1.
  • Fixed issues concerning detailed stats retrieval robustness for both MapReduce and Tez platforms.
  • Updated build to exclude jgrapht-ext, further isolation of jgrapht apis to support reliable shading.
  • Fixed issue on Apache Tez where a split before and subsequent splicing back into a c.p.HashJoin could create an invalid plan.
  • Fixed issue where an unreachable YARN timeline server could cause the application to fail.
  • Fixed issue with NPE when retrieving Tez task status from timeline server.

For a detailed list of changes in this release, see:

It can be downloaded here:

The source can be found here:


Cascading 2.7 Maintenance Release

We have just published Cascading 2.7.1, a minor maintenance release.
This release resolves the following issues:
  • Fixed issue where c.p.GroupBy or c.p.CoGroup would fail if attempting to group or join incoming Fields.UNKNOWN tuple streams using relative positions in the grouping fields selectors.
  • Fixed issue where c.u.ShutdownUtil could log a NPE if a hook is removed during JVM shutdown.

It can be downloaded here:


Cascading Newsletter - July 2015

July 2015 Newsletter

Cascading 3.0 Maintenance Release

We have just published a new maintenance release 3.0.1 of Cascading.
This release resolves the following issue:
– Fixed issue in c.f.t.p.Hadoop2TezFlowStepJob where the LocalResources were not passed to the AppMaster correctly causing ClassNotFoundException during split calculation for custom InputFormats.
It can be downloaded from these locations:

Cascading Newsletter - June 2015

There has been a lot going on in the last month. Cascading 3.0 release is now available. This release helps future-proof your data infrastructure investmentsand by supporting newer compute fabrics as they become available. Also, a new EAP version for Driven is freely available for doing real time performance testing of your Cascading/Scalding apps. A Scalding blog reports dramatic improvements in performance of Cascading 3.0 on Apache Tez. Netflix / PigPen published a Getting Started Guide for Cascading users. New Concurrent blogs include a tutorial on how to run Cascading on AWS EMR and how to boost Hadoop performance through better Dev and Ops collaboration. Continue reading