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This test query is supposed to check the error path for when a collection buffer cannot be allocated. However, it's flaky because the collection allocations are not very big (< 2KB), so it's possible for a different operator to trigger OOM. I think the correct solution is to create a test file that contains very large collections, so a large collection allocation will trigger OOM, rather than many small collection allocations. For now though, let's disable the specific collection allocation check to unblock the build, even though we risk losing coverage. Change-Id: Iab4c9b605186926c522cf692246a37882fbdfcdb Reviewed-on: http://gerrit.cloudera.org:8080/2208 Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com> Tested-by: Internal Jenkins
Welcome to Impala
Lightning-fast, distributed SQL queries for petabytes of data stored in Apache Hadoop clusters.
Impala is a modern, massively-distributed, massively-parallel, C++ query engine that lets you analyze, transform and combine data from a variety of data sources:
- Best of breed performance and scalability.
- Support for data stored in HDFS, Apache HBase and Amazon S3.
- Wide analytic SQL support, including window functions and subqueries.
- On-the-fly code generation using LLVM to generate CPU-efficient code tailored specifically to each individual query.
- Support for the most commonly-used Hadoop file formats, including the Apache Parquet (incubating) project.
- Apache-licensed, 100% open source.
More about Impala
To learn more about Impala as a business user, or to try Impala live or in a VM, please visit the Impala homepage.
If you are interested in contributing to Impala as a developer, or learning more about Impala's internals and architecture, visit the Impala wiki.