Apache Druid Q&A

Optimisation Questions related to stabilizing, tuning and optimizing Druid’s performance. System Operations Questions about monitoring, maintaining, securing and upgrading Druid processes. Google Groups (read only) Tap into more community knowledge with this read-only copy of the druid-user Google Group. Design & Architecture Questions about how Druid fits into your planned or existing data and analytics pipelines. Data Management Questions about distributing, optimizing and deleting data within Druid. Query Questions about SQL and Druid Native query design, execution, and optimization. Deploy & Configure General questions about the design, deployment, stabilisation, and operation of an Apache Druid data pipeline. Model & Ingest Questions about modeling, ingesting and indexing batch and real-time data.

Topic	Replies	Views	Activity
About the Apache Druid Q&A category Apache Druid Q&A	0	125	November 3, 2020
What does Druid use the druid_datasource metadata table for? Model & Ingest kafka	0	10	December 4, 2021
Getting SSL error while bin/post-index-task Model & Ingest data-ingestion	2	31	December 2, 2021
Concat two nested fields from JSON in Spec Model & Ingest	6	26	December 2, 2021
Segments not overwritten with Minor Compaction Model & Ingest compaction	1	32	December 2, 2021
Native index_parallel Ingestion failing at scale with Caused by: org.jboss.netty.channel.ChannelException: Failed to connect to host Model & Ingest ingestion , s3 , data-management , data-ingestion	1	34	December 2, 2021
Druid Lookup is loaded but not available for querying Query	2	35	December 2, 2021
Parse access logs wrapped in docker logs (json) Model & Ingest data-ingestion , transform	2	48	December 2, 2021
Fail to configure data ingestion from minio object storage Deploy & Configure s3 , data-ingestion	13	106	December 2, 2021
Decommission druid historical nodes Deploy & Configure data-management , data-analysis	2	21	December 2, 2021
Ingesting data from Apache Hive Model & Ingest	1	23	December 1, 2021
Error Timestamp loading data Model & Ingest	1	26	November 30, 2021
Client pagination Model & Ingest	1	18	November 29, 2021
Reindex from druid - task not returning data Model & Ingest	1	38	November 13, 2021
Kafka Ingested data are not available immediately for querying Model & Ingest	17	116	November 11, 2021
Whatever I do I am unable to get more than 5 to 10 TPS Deploy & Configure data-ingestion , data-analysis	6	45	November 8, 2021
Index_parallel job tuning Model & Ingest ingestion , data-ingestion , troubleshooting	2	47	November 4, 2021
Jets3t.properties in Druid operator System Operations	1	48	November 4, 2021
Druid Datasource not loading Deploy & Configure	1	34	November 1, 2021
Optimize nested aggregations Query data-analysis	3	101	October 14, 2021
Are my segment sizes too small, or should I optimize my queries? Optimisation kafka , compaction	3	97	October 13, 2021
Detect new data arrival from kafka into druid cluster Model & Ingest	2	55	October 13, 2021
Druid ingestion Incremental persist failed Model & Ingest data-ingestion	3	69	October 12, 2021
First / Last aggregator in ingestion spec Model & Ingest kafka , data-ingestion	1	71	October 11, 2021
Druid Dedicated worker category queue Deploy & Configure	2	113	October 11, 2021
Problems to select “Avro Stream” input format when creating an ingestion spec using the Apache Druid UI Model & Ingest	3	79	October 8, 2021
Cannot see the logs of FAILED Task Model & Ingest data-ingestion , data-analysis	4	131	October 7, 2021
Issues with postgresql input source: `java.lang.ClassNotFoundException: org.postgresql.Driver` Model & Ingest postgres	1	58	October 6, 2021
Request has been blocked by CORS policy: Response to preflight request doesn't pass access control check in Apache Druid Deploy & Configure troubleshooting	3	223	October 5, 2021
Querying with a limit and grouping by a numeric field returns inconsistent results Query	10	164	September 29, 2021