Parallelize TransactionImpl.readUnread() (#1080)

When a transaction only writes to a row+col and then has a collision
Fluo will read the row+col after the collision to look for orphaned
locks. This commit parallelizes this behavior by reading all row+cols
at once.

This commit accomplishes this by using a ParallelSnapshotScanner
instead of a SnapshotScanner.

Fixes #948
3 files changed
tree: 59f9f34f8032ae328aa9f527d5ed29a51edf623e
  1. .gitignore
  2. .travis.yml
  7. contrib/
  8. modules/
  9. pom.xml


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Apache Fluo is a distributed processing system that lets users make incremental updates to large data sets. With Apache Fluo, users can set up workflows that execute cross node transactions when data changes. These workflows enable users to continuously join new data into large existing data sets without reprocessing all data. Apache Fluo is built on Apache Accumulo. Check out the Fluo project website for news and general information.

Getting Started

  • Take the Fluo Tour if you are completely new to Fluo.
  • Read the Fluo documentation to learn how to install Fluo and start a Fluo application on a cluster where Accumulo, Hadoop & Zookeeper are running. If you need help setting up these dependencies, see the related projects page for external projects that may help.