mirror of
https://github.com/apache/impala.git
synced 2026-01-06 06:01:03 -05:00
b9034ea0d5
The following sequence can lead to a crash:
1. Client sets result cache size to N
2. Client issues query with #results < N
3. Client fetches all results, triggering eos and tearing down
Coordinator::root_sink_.
4. Client restarts query with FETCH_FIRST.
5. Client reads all results again. After cache is exhausted,
Coordinator::GetNext() is called to detect eos condition again.
6. GetNext() hits DCHECK(root_sink_ != nullptr).
This patch makes GetNext() a no-op if called after it sets *eos,
avoiding the crash..
Testing:
Regression test that triggered the bug before this fix.
Change-Id: I454cd8a6cf438bdd0c49fd27c2725d8f6c43bb1d
Reviewed-on: http://gerrit.cloudera.org:8080/5335
Reviewed-by: Henry Robinson <henry@cloudera.com>
Reviewed-by: Dan Hecht <dhecht@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.
Supported Platforms
Impala only supports Linux at the moment.
Build Instructions
See bin/bootstrap_build.sh.
Export Control Notice
This distribution uses cryptographic software and may be subject to export controls. Please refer to EXPORT_CONTROL.md for more information.