Apache Druid: a high performance real-time analytics database.
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Kashif Faraz c937068625
Improve polling in segment allocation queue (#15590)
Description
When batchAllocationWaitTime is set to 0, the segment allocation queue is polled continuously even when it is empty. This would take up cpu cycles unnecessarily.

Some existing race conditions would also become more frequent when the batchAllocationWaitTime is 0. This PR tries to better address those race conditions as well.

Changes
Do not reschedule a poll if queue is empty
When a new batch is added to queue, schedule a poll
Simplify keyToBatch map
Handle race conditions better
As soon as a batch starts getting processed, do not add any more requests to it
2024-01-04 17:42:02 +05:30
.github Upgrade CodeQL from v2 to latest v3. (#15619) 2024-01-03 11:31:53 -08:00
.idea Ignore misc.xml (#14362) 2023-06-02 12:00:52 +05:30
benchmarks expression virtual column indexes (#15585) 2024-01-03 21:00:39 -08:00
cloud Prepare master for Druid 29 (#15121) 2023-10-11 10:33:45 +05:30
codestyle fix rat and checkstyle issue (#15530) 2023-12-14 09:33:01 +08:00
dev Suggest adoption of Google Style guide (#14905) 2023-11-01 13:31:03 -07:00
distribution Add MSQ Durable Storage Connector for Google Cloud Storage and change current Google Cloud Storage client library (#15398) 2023-12-14 07:34:49 +05:30
docs Azure client upgrade to allow identity options (#15287) 2024-01-03 18:36:05 -05:00
examples router.sh is missing in Druid Distribution (#15547) 2023-12-15 10:42:04 -08:00
extensions-contrib Reverse lookup fixes and enhancements. (#15611) 2024-01-03 13:28:44 -08:00
extensions-core Run filter-into-join rule early for subqueries and disable project-filter rule (#15511) 2024-01-04 15:33:45 +05:30
helm/druid helm: Add serviceAccounts, rbac, and small fixes (#13747) 2023-02-23 11:42:03 +05:30
hooks Git hooks should fail on errors; pass args to git hooks (#12322) 2022-03-10 09:07:50 +09:00
indexing-hadoop simplify IncrementalIndex since group-by v1 has been removed (#15448) 2023-11-29 14:46:16 -08:00
indexing-service Improve polling in segment allocation queue (#15590) 2024-01-04 17:42:02 +05:30
integration-tests [Flaky test] Fix basic auth integration test (#15561) 2023-12-23 12:11:12 +05:30
integration-tests-ex Add MSQ Durable Storage Connector for Google Cloud Storage and change current Google Cloud Storage client library (#15398) 2023-12-14 07:34:49 +05:30
licenses Web console: Update and prune dependancies (#15487) 2023-12-05 14:25:07 -08:00
processing expression virtual column indexes (#15585) 2024-01-03 21:00:39 -08:00
publications De-incubation cleanup in code, docs, packaging (#9108) 2020-01-03 12:33:19 -05:00
server Reverse lookup fixes and enhancements. (#15611) 2024-01-03 13:28:44 -08:00
services Add logging implementation for AuditManager and audit more endpoints (#15480) 2023-12-19 13:14:04 +05:30
sql Run filter-into-join rule early for subqueries and disable project-filter rule (#15511) 2024-01-04 15:33:45 +05:30
web-console Detect EXPLAIN PLAN queries in web-console (#15570) 2023-12-15 12:12:03 -05:00
website Azure client upgrade to allow identity options (#15287) 2024-01-03 18:36:05 -05:00
.asf.yaml .asf.yaml: Add required "repository" field. (#14499) 2023-06-28 15:05:07 -07:00
.backportrc.json Add 0.18.0 to .backportrc.json to facilitate backport. (#9661) 2020-04-11 13:49:04 -07:00
.codecov.yml Use Codecov (#8388) 2019-08-28 08:49:30 -07:00
.dockerignore Add docker container for druid (#6896) 2019-02-08 12:12:28 +00:00
.gitignore Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
.lgtm.yml be consistent about referring to the web console by its name (#13118) 2022-09-19 15:02:17 -07:00
CONTRIBUTING.md Document our conventions for writing messages (#13916) 2023-04-03 21:30:20 -07:00
LABELS Fixing security vulnerability check errors (#13956) 2023-03-23 11:10:06 +05:30
LICENSE Adding the PropertyNamingStrategies from jackson for fixing hadoop ingestion (#14671) 2023-08-01 20:02:43 +05:30
NOTICE update NOTICE year, update kafka notice in licenses.yaml (#14299) 2023-05-17 04:32:19 -07:00
README.md Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
README.template De-incubation cleanup in code, docs, packaging (#9108) 2020-01-03 12:33:19 -05:00
check_test_suite.py Update Hadoop3 as default build version (#14005) 2023-04-26 12:52:51 +05:30
check_test_suite_test.py remove Travis CI (#13789) 2023-02-10 01:46:56 -08:00
doap_Druid.rdf Fix the created property in DOAP RDF file (#14971) 2023-09-13 06:12:35 -07:00
it.sh Build reliablity fixes (#15048) 2023-09-28 12:27:52 -07:00
licenses.yaml Azure client upgrade to allow identity options (#15287) 2024-01-03 18:36:05 -05:00
owasp-dependency-check-suppressions.xml unpin snakeyaml, add suppressions and licenses (#15549) 2023-12-15 10:33:14 -08:00
pom.xml unpin snakeyaml, add suppressions and licenses (#15549) 2023-12-15 10:33:14 -08:00
upload.sh Adding licenses and enable apache-rat-plugin. (#6215) 2018-09-18 08:39:26 -07:00

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Apache Druid

Druid is a high performance real-time analytics database. Druid's main value add is to reduce time to insight and action.

Druid is designed for workflows where fast queries and ingest really matter. Druid excels at powering UIs, running operational (ad-hoc) queries, or handling high concurrency. Consider Druid as an open source alternative to data warehouses for a variety of use cases. The design documentation explains the key concepts.

Getting started

You can get started with Druid with our local or Docker quickstart.

Druid provides a rich set of APIs (via HTTP and JDBC) for loading, managing, and querying your data. You can also interact with Druid via the built-in web console (shown below).

Load data

data loader Kafka

Load streaming and batch data using a point-and-click wizard to guide you through ingestion setup. Monitor one off tasks and ingestion supervisors.

Manage the cluster

management

Manage your cluster with ease. Get a view of your datasources, segments, ingestion tasks, and services from one convenient location. All powered by SQL systems tables, allowing you to see the underlying query for each view.

Issue queries

query view combo

Use the built-in query workbench to prototype DruidSQL and native queries or connect one of the many tools that help you make the most out of Druid.

Documentation

See the latest documentation for the documentation for the current official release. If you need information on a previous release, you can browse previous releases documentation.

Make documentation and tutorials updates in /docs using Markdown or extended Markdown (MDX). Then, open a pull request.

To build the site locally, you need Node 16.14 or higher and to install Docusaurus 2 with npm|yarn install in the website directory. Then you can run npm|yarn start to launch a local build of the docs.

If you're looking to update non-doc pages like Use Cases, those files are in the druid-website-src repo.

Community

Visit the official project community page to read about getting involved in contributing to Apache Druid, and how we help one another use and operate Druid.

  • Druid users can find help in the druid-user mailing list on Google Groups, and have more technical conversations in #troubleshooting on Slack.
  • Druid development discussions take place in the druid-dev mailing list (dev@druid.apache.org). Subscribe by emailing dev-subscribe@druid.apache.org. For live conversations, join the #dev channel on Slack.

Check out the official community page for details of how to join the community Slack channels.

Find articles written by community members and a calendar of upcoming events on the project site - contribute your own events and articles by submitting a PR in the apache/druid-website-src repository.

Building from source

Please note that JDK 8 or JDK 11 is required to build Druid.

See the latest build guide for instructions on building Apache Druid from source.

Contributing

Please follow the community guidelines for contributing.

For instructions on setting up IntelliJ dev/intellij-setup.md

License

Apache License, Version 2.0