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Apache Druid: a high performance real-time analytics database.
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Roman Leventov 36a1543222 Lookup cache bug fixes (#3609) 
* Return better lastVersion from JDBCExtractionNamespaceCacheFactory's cache populator callable

* Return the lastVersion if URI lookup last modified date is not later than the last cached, from URIExtractionNamespaceCacheFactory's cache populator callable

* Fix a race condition in NamespaceExtractionCacheManager.cancelFuture()

* Don't delete cache from NamespaceExtractionCacheManager if the ExtractionNamespaceCacheFactory returned the same version as the last; Better exception treatment in the scheduled cache updater runnable in NamespaceExtractionCacheManager (in particular, don't consume Errors); throw AssertionError in StaticMapExtractionNamespaceCacheFactory if the lastVersion != null)

* In NamespaceExtractionCacheManager, put NamespaceImplData.latestVersion update in the same synchronized() block with swapAndClearCache(id, cacheId); Turn getPostRunnable which returns a callback into a simple updateNamespace() method

* In StaticMapExtractionNamespaceCacheFactory.getCachePopulator(), check the input directly, not inside a callback

* In URIExtractionNamespaceCacheFactory, allow URI last modified time to go backwards

* Better logging in NamespaceExtractionCacheManager

* Add comment on lastVersion nullability in URIExtractionNamespaceCacheFactory
 		2016-11-02 09:40:19 -07:00
api Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
aws-common Bump versions to 0.9.3-SNAPSHOT (#3524) 2016-09-29 13:53:32 -07:00
benchmarks eagerly allocate the intermediate computation buffers (#3628) 2016-10-31 15:24:07 -07:00
codestyle Add Checkstyle framework (#3551) 2016-10-13 13:37:47 -07:00
common Math expressions support for missing columns. (#3630) 2016-11-01 09:40:25 -07:00
distribution Add druid-lookups-cached-single to default distribution build (#3550) 2016-10-15 08:11:04 -07:00
docs manage overshadowing efficiently at coordinator (#3584) 2016-10-24 22:49:08 +05:30
examples fix 'No Such File' error when execute script out of druid installation directory (#3517) 2016-11-01 09:57:09 -07:00
extensions-contrib Deprecate Aggregator.getName and AggregatorFactory.getAggregatorStartValue. (#3572) 2016-10-31 15:24:30 -07:00
extensions-core Lookup cache bug fixes (#3609) 2016-11-02 09:40:19 -07:00
indexing-hadoop Deprecate Aggregator.getName and AggregatorFactory.getAggregatorStartValue. (#3572) 2016-10-31 15:24:30 -07:00
indexing-service Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
integration-tests Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
java-util Faster interval comparator (#3605) 2016-10-26 14:20:27 +05:30
processing fix zero period in PeriodGranularity causing gran.iterable(start, end) infinite loop (#3644) 2016-11-02 15:40:07 +05:30
publications Changes to lambda architecture paper required for HICSS (#3382) 2016-09-06 21:32:21 -07:00
server max row limit is necessary is connector is setup for streaming (#3635) 2016-11-01 09:39:55 -07:00
services Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
.gitignore move distribution artifacts to distribution/target 2015-10-30 12:40:05 -05:00
.travis.yml Disable cobertura travis portion (#3122) 2016-06-13 12:27:35 +05:30
CONTRIBUTING.md Add doc link to eclipse formatting settings as well (#3131) 2016-06-24 15:27:50 -07:00
DruidCorporateCLA.pdf fix CLA email / mailing address 2014-04-17 15:26:28 -07:00
DruidIndividualCLA.pdf fix CLA email / mailing address 2014-04-17 15:26:28 -07:00
LICENSE Clean up README and license 2015-02-18 23:09:28 -08:00
NOTICE Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
README.md update readme (#2830) 2016-04-13 11:33:31 -07:00
druid_intellij_formatting.xml Make formatting IntelliJ 2016 friendly (#2978) 2016-05-18 12:42:21 -07:00
eclipse.importorder Merge pull request #2905 from javasoze/eclipse_formatting 2016-04-29 18:42:03 -07:00
eclipse_formatting.xml Merge pull request #2905 from javasoze/eclipse_formatting 2016-04-29 18:42:03 -07:00
pom.xml Migrating java-util from Metamarkets. (#3585) 2016-10-21 14:57:07 -07:00
upload.sh upload.sh: Use awscli if s3cmd is not available. (#3114) 2016-06-08 17:01:46 -07:00

README.md

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Druid

Druid is a distributed, column-oriented, real-time analytics data store that is commonly used to power exploratory dashboards in multi-tenant environments.

Druid excels as a data warehousing solution for fast aggregate queries on petabyte sized data sets. Druid supports a variety of flexible filters, exact calculations, approximate algorithms, and other useful calculations.

Druid can load both streaming and batch data and integrates with Samza, Kafka, Storm, Spark, and Hadoop.

License

Apache License, Version 2.0

More Information

More information about Druid can be found on http://www.druid.io.

Documentation

You can find the documentation for the latest Druid release on the project website.

If you would like to contribute documentation, please do so under /docs/content in this repository and submit a pull request.

Getting Started

You can get started with Druid with our quickstart.

Reporting Issues

If you find any bugs, please file a GitHub issue.

Community

Community support is available on the druid-user mailing list(druid-user@googlegroups.com).

Development discussions occur on the druid-development list(druid-development@googlegroups.com).

We also have a couple people hanging out on IRC in #druid-dev on irc.freenode.net.

Contributing

Please follow the guidelines listed here.