Release - Federate v26

We’re happy to announce today the release of Siren Federate version 26, which is compatible with Elasticsearch version 7.15.1. This release includes the following enhancements and fixes:


  • Parts of our tuple-at-a-time query processing pipeline are replaced with a vectorized query processing pipeline. This will improve the overall performance of the system by increasing the worker thread throughput and by reducing in-memory I/O load by using a contiguous memory chunk. Our objective is to complete this work and switch to a fully-vectorized query processing pipeline in Siren Federate version 27. A benchmark report will be published at release time.
  • Upgraded to Elasticsearch version 7.15.1.

Breaking changes:

  • Removed a deprecated property,, in favor of the siren.memory.root.limit setting.
  • If Search Guard is the configured security system, the node-level setting searchguard.allow_custom_headers: "siren.*" must be added to each node of the cluster.
  • Changed the format of the JSON response for Cluster APIs Nodes Statistics.

Bug fixes:

  • Fixed a join cache issue with Elastic Stack Security’s templated queries when they include placeholders such as {{ _user: }}.
  • Fixed a ConcurrentModificationException in the select phase following a recent change in Elasticsearch 7.15 involving the FieldUsageTrackingDirectoryReader.
  • Adjusted the validation query in the datasource validation endpoint with the latest Avatica JDBC connector.
  • Adjusted the autoCommit setting to work with the latest Avatica JDBC connector.
  • Fixed a rare issue where a cluster is unable to initialize a Federate job due to a closed RootBufferManager on a node.
  • Fixed a broken link to the _sample method in the connector APIs documentation.

Download it here.