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Questions tagged [druid]

Druid is a column-oriented open-source distributed data store written in Java.

According to the Apache Druid website:

Apache Druid is a real-time analytics database designed for fast slice-and-dice analytics ("OLAP" queries) on large data sets. Most often, Druid powers use cases where real-time ingestion, fast query performance, and high uptime are important.

Druid is commonly used as the database backend for GUIs of analytical applications, or for highly-concurrent APIs that need fast aggregations. Druid works best with event-oriented data.

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How to make oracle data export to druid.io

I'm using druid and imply, how to make oracle data export to druid.io? How to export oracle data to druid databases?
Gank
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Connecting Druid with MySQL

I finish setting up Druid on my computer by reading quickstart guide. I do setup MySQL extension by reading MySQL Metadata Store as well. But, when I sign to mysql to mysql -u druid -p dirud I got druid table only.I don't have any data that I…
Set Kyar Wa Lar
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Which druid node is best to install Apache Superset on?

I originally installed Apache Superset on the same AWS node that I have the coordinator and overlord processes running on. Superset ran ok. Then I moved it to its own utility node to see if it would be faster. Turns out it is much slower (queries…
Climbs_lika_Spyder
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Timeseries database with multi-column aggregation

I am trying to design a system that has time-series data. Here are the requirements of the system: Data comes into the system anytime of the day from multiple cities and departments. These individual records should be available for life-time.…
emkay
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Cassandra vs Druid

I have a use case where i had to analyze real time data using Apache Spark. But i still have a confusion related to choosing data store for my application. The analysis mostly include aggregation, KPI based identity analysis and machine learning…
Arslan
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Why get the connection that has been closed, resulting in "holder is null" error

This is the nesting problem, please help to analyze the reasons Overall code structure description： TransactionA in some of the DB operation, and then open the transactionB. TransactionA commit time to trigger a custom trigger, the trigger in the…
sinory
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Streamming data to Druid Server

I have ad log data and I want to send it real-time to Druid server. But, the issue is that between Tranquility and Kafka. Which is the best method to ingest data real-time. Because, when using kafka it make a bundle of error. I try to use…
VanThaoNguyen
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"error" : "null exception" in timeseries query on Druid

I am using timeseries query on my indexed data, the snippets belows: { "queryType": "timeseries", "dataSource": "statistic-test-v1", "granualarity": "hour", "descending": "true", "aggregations":[{"type": "longSum", "name": "output_imp",…
VanThaoNguyen
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Cause: java.sql.SQLException: connection is closed

db : Mydql connection pool ： Druid jdk7 mybatis org.springframework.jdbc.UncategorizedSQLException: ### Error querying database. Cause: java.sql.SQLException: connection is closed ### The error may exist in class path resource…
JackLong Lee
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Tech stack selection for DMP systems

Our DMP system has such a demand： 1. Audience Export: Audience based on tag need to export new demographic results to Redis or files every day, to DSP. Because the tag data is refreshed every day.We have 600 million users.When we have tens of…
snow
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