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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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NullPointerException while loading extension in linux

Hi I am new to Druid and zookeeper and was trying out their basic sort of tut here. What I did is just to run two commands. The first one is to run the zookeeper: [root@ingester bin]# source zkServer.sh start JMX enabled by default Using config:…
Mahesha999
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How to configure tranquility to show debug log

I want to use tranquility and its Storm Bolt to send data to druid.So I wrote a storm topology(with dependency of tranquility) and compile it to a jar file, then use run storm with that jar file in local mode. Yet I came across problems: the storm…
Allan Ruin
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Druid not storing to AWS S3

I am trying to push the data to AWS S3. I had user the example in (http://druid.io/docs/0.7.0/Tutorial:-The-Druid-Cluster.html) but modified the common.runtime.properties as below…
user2611300
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No content to map due to end-of-input

Seemingly out of the blue I'm getting this response to formerly working Druid queries. My guess is this isn't specific to Druid, but I can't seem to figure it out: { "error" : "No content to map due to end-of-input\n at [Source: [B@2862fe6e; line:…
Elijah
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Booting a Druid Cluster using Whirr

I am trying to boot a Druid cluster using Whirr following the steps in Druid website http://druid.io/docs/latest/Booting-a-production-cluster.html The cluster is instantiated, but the different Druid nodes (overlord, middleManager, historical and…
deepkimo
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how to start druid from puppet script

I am trying to run druid on a local vagrant machine. I use puppet to get archives, extract them etc. However I get a problem when trying to run historical and overlord node. I use following code to start servers: file_line {…
homar
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java.lang.NoClassDefFoundError: com/alibaba/druid/pool/DruidDataSourceFactory

I use druid as a Database connection pool in my maven project. I use 'maven package' to have a jar package. Then I just run it. However, it has a java.lang.NoClassDefFoundError exception. In detail, It is that Exception in thread "main"…
jackson
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druid sql query - count distinctly for a multi value field across records

Is there a way to do a distinct count across different rows for a multi-value field in druid SQL for a particular value in which value is only counted once across an array? eg suppose I have below records : shippingSpeed [standard, standard,…
Amol Aggarwal
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How to change the druid admin default password?

In Druid I am using default basic authenticator My config look like…
Derilxavier
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can I set the limit to avoid disk full

Is there any way that I can set the limit on historical node? getting error message that says "disk full" frequently, can I fix this? Druid version I am using is 0.18.1 Thank you.
user17324791
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Find average value for each hour interval in a certain time period

I have a database with the following columns: time, device, metric, value. For every minute, this database collects the value for the respective device/metric combination. I'm trying to write code that will give me the average value over each hour…
carsof
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Apache Druid: My VM hangs when I try to load quickstart data

I'm new to Apache Druid. I used Azure VM (Standard B2s (2 vcpus, 4 GiB memory)) to install apache druid and then tried to load the quick-start tutorial json data (wikiticker-2015-09-12-sampled.json.gz) using console. I followed all the instructions…
Udayan
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Unable to return value to caller function scala

I am trying to call one of the utility functions, but unable to return value to the caller, but somehow I am not able to return the response to the caller; i.e the main function. What could be the issue? I tried reassigning the response to a local…
user3151539
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Why Apache Druid is considered real-time database?

This is a question that relates to how Druid is being marketed. Why is it called real time database, when - as I understand - before any data can be efficiently read from DB there is a need for heavy lifting ETL using external tool (like Hive or…
user2530062
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Apache druid database design

I have heard lot of druid aggregation capabilities. Can someone share any blog/material as to how a druid data base model looks like ,probably with a UML diagram. I am currently exploring druids quick aggregation capabilities. Also it would be…
souradeep majumdar
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