druid | Apache Druid : a high performance
kandi X-RAY | druid Summary
kandi X-RAY | druid Summary
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.
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Top functions reviewed by kandi - BETA
- Runs the internal task .
- Constructs and initializes a Jetty Server .
- Translates an expression into a leaf filter .
- Scan and aggregate the data for the specified dimensions .
- Intersection of two sets .
- Generates a proxy for a given hostname .
- Process an announcement .
- Merge and push a sink .
- Make a join cursor from a joinable joinable .
- Generate and publish segments .
druid Key Features
druid Examples and Code Snippets
License : Strong Copyleft (CC BY-SA 4.0)
CopyERROR: Could not find a version that satisfies the requirement psycopg2== (from versions: 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.3.2, 2.4, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.5, 2.5.1, 2.5.2, 2@echo off
rem =============================================================================
rem Purpose & Instructions:
rem =============================================================================
rem Because MS-Windows assigns a#!/bin/bash
# This script is used to fetch external packages that are not available in standard Linux distribution
# Example: ./fetch-external-dependencies ubuntu18.04
# Script will create nms-dependencies-ubuntu18.04.tar.gz in local direwsl -l -v
# Confirm distribution name
wsl --set-version 1
static void main(a) {
WebDriverManager.chromedriver().setup()
WebDriver driver = new ChromeDriver(new ChromeOptions())
driver.get('https://nbc.com')
300.times {
driver.executeScript("window.open('https://nbc.com')")using Plots, Distributions
vᵤ = -0.1:0.005:4
f_s0 = pdf.(Uniform(0,1), vᵤ) # uniform distribution with area 1
plot(vᵤ, f_s0, label="f_s0", framestyle=:box)
vᵪ = 0:0.005:4
F_s = pdf.(Chi(3), vᵪ) # chi distribution with area 1
plot!(vᵪ, import networkx as nx
from networkx.generators.random_graphs import binomial_graph
from networkx.generators.degree_seq import expected_degree_graph
import matplotlib.pyplot as plt
import numpy as np
fig=plt.figure()
N_nodes=1000
G=binomiversion: "3"
services:
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
environment:
- "MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD"
- "MYSQL_PWD=$MYSQLSub FormatExcel()
Dim ws As Worksheet, wb As Workbook
Set wb = ThisWorkbook 'ActiveWorkbook?
Set ws = wb.Worksheets("Master")
CopyBlock ws, "All Call Distribution by Queue", "All Calls by Queue"
CopyBlock ws,F = A'B' + A'B + AB
F = A'(B'+B) + AB Distribution Law
F = A'(1) + AB Complement Law
F = A' + AB Identity Law
F = A'(B + 1) + AB Annulment Law
F = A'B + A' + AB Distribution Law
F = (A' + A)B + A' DistrCommunity Discussions
Trending Discussions on druid
QUESTION
I'm learning JavaWeb and deploying local tomcat9 in idea. An exception occurred when I tried to connect to the database by reading the properties file. It should be that my properties file was not found.
I tried to change the file path but it didn't work. What should I do?
This is my method to connect to the database and message
...ANSWER
Answered 2022-Apr-02 at 16:04This problem has been solved.Thank for rehnoj's help.
The answer in Different behavior of ClassLoader.getSystemClassLoader().getResource() in servlet container and test environment.
The correct code
QUESTION
I wanted to get Strings/ints of several Items out of a JSON Array, but I don't really know how I can achieve that
...ANSWER
Answered 2022-Mar-23 at 01:04The value of the key "mythic_plus_best_runs" is an array.
So, you must loop over it to get all "dungeon" values.
QUESTION
I am trying to download image using another thread and to send downloaded bytes in ImageBuf object to main thread using Druid command system. The code I am using is:
...ANSWER
Answered 2022-Feb-18 at 11:11TL;DR
Add generic argument: pub(crate) const UPDATE_IMAGE_COMMAND: Selector = Selector::new("update_image");
Thanks to comment from @Caesar i applied .submit_command::(…) and figured out that druid Selector have generic type on them which determines what kind of payload can be sent with the finally generated Command.
Default type for Selector is so the fix for my problem was just to add ImageBuf as generic argument for selector as shown in the code snippet above
QUESTION
My maven settings.xml is as follows. As you can see, there is no http repository url. All repository url is started with https.
...ANSWER
Answered 2022-Feb-18 at 06:54I find answer myself. I used to config ~/.gradle/init.gradle and set a http url which force gradle to use that insecure repository
QUESTION
I am using Druid as datasource for my grafana. I want to ignore the first and last data points from the druid query result(like trimming the edges). I am thinking of modifying the timestamp passed to druid query from the timepicker. But I cannot find a way to modify the timestamp choosen from the timepicker in grafana. Is there any other way to ignore the first and last data points? Sample query sent by grafana
...ANSWER
Answered 2022-Feb-14 at 13:24I don't know about Druid specifically, but I can answer your question and tell you that it is possible to modify the time range selected by the time picker.
That is by using the built in variables $__from and $__to. Those give you begin and respectively end of the selected time range in UNIX milliseconds. You can then add/subtract milliseconds to/from those to modify the time range used in your query (e.g. in the WHERE clause).
QUESTION
I have gone through following Druid Scan query documentation https://druid.apache.org/docs/0.20.0/querying/scan-query.html . I didn't understand the part when it says. "note that if the underlying datasource is modified in between page fetches in ways that affect overall query results, then the different pages will not necessarily align with each other."
In my case data is added to Druid in real time which means suppose I queried for last one hour data(4-5PM), it might possible that earlier we had 40 records for that query but during the query we received 10 new records. My assumption is that all new records should get added post 40th record and it should not impact the current running paging offset. Please help me how realtime ingestion of data can impact the Druid pagination and what could be the possible fix for that.
...offset : Together, "limit" and "offset" can be used to implement pagination. However, note that if the underlying datasource is modified in between page fetches in ways that affect overall query results, then the different pages will not necessarily align with each other.
ANSWER
Answered 2022-Jan-28 at 20:32The docs describe that the offset/limit are application side values. From the database perspective, it is running the whole query again with every request and just returning the rows between offset and offset + limit.
So, if ordered by __time desc, new rows will appear at the top of the results and therefore shift the content of the pagination.
If sorted __time asc, and no out of time order rows are ingested between calls, then the pagination should be constant and new rows appear at the end.
Also remember that it is a good practice to limit the overall timeframe that you are querying.
QUESTION
I am trying to automate druid batch ingestion using Airflow. My data pipeline creates EMR cluster on demand and shut it down once druid indexing is completed. But for druid we need to have Hadoop configurations in druid server folder ref. This is blocking me from dynamic EMR clusters. Can we override Hadoop connection details in Job configuration or is there a way to support multiple indexing jobs to use different EMR clusters ?
...ANSWER
Answered 2022-Jan-20 at 22:21In researching how this might be done, I found hadoopDependencyCoordinates property here: https://druid.apache.org/docs/0.22.1/ingestion/hadoop.html#task-syntax
which seems relevant.
QUESTION
I'm developing a web scraper to mine data from the Solis Pro platform (Ginlong), but I'm having problems getting the asynchronous data from the plants registered by the user. I'm using Selenium + bs4 and the following has happened. The url is https://m.ginlong.com/pro/epc/plantview/view/doAsyncPlantList.json. I send a payload and in theory I should receive the data, but I am either receiving an error or only part of the data (only {status: 1}).
...ANSWER
Answered 2022-Jan-18 at 14:00Change: response = webdriver.request('POST', url+'pro/epc/plantview/view/doAsyncPlantList.json', headers=headers, data=postData)
to this: response = webdriver.request('POST', url+'pro/epc/plantview/view/doAsyncPlantList.json', headers=headers, json=json.dumps(postData))
(remember to import json) :)
I am not sure why this works but it does, for further reading see this discussion about the difference between data= and json= : Difference between data and json parameters in python requests package
Also, I've managed to get it work with requests only which should speed things up, note that I've had to change my url at the end to "cpro" not "pro" like yours since I don't have a pro account: "https://m.ginlong.com/pro/epc/plantview/view/doAsyncPlantList.json"
QUESTION
I installed apache-druid-0.22.1 as a cluster (master, data and query nodes) and enabled “druid-google-extensions” by adding it to the array druid.extensions.loadList in common.runtime.properties. Finally I defined GOOGLE_APPLICATION_CREDENTIALS ( which has the value of service account json as defined in https://cloud.google.com/docs/authentication/production )as an environment variable of user that run the druid services. However, I got the following error when I try to ingest data from GCR buckets:
Error: Cannot construct instance of org.apache.druid.data.input.google.GoogleCloudStorageInputSource, problem: Unable to provision, see the following errors: 1) Error in custom provider, java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information. at org.apache.druid.common.gcp.GcpModule.getHttpRequestInitializer(GcpModule.java:60) (via modules: com.google.inject.util.Modules$OverrideModule -> org.apache.druid.common.gcp.GcpModule) at org.apache.druid.common.gcp.GcpModule.getHttpRequestInitializer(GcpModule.java:60) (via modules: com.google.inject.util.Modules$OverrideModule -> org.apache.druid.common.gcp.GcpModule) while locating com.google.api.client.http.HttpRequestInitializer for the 3rd parameter of org.apache.druid.storage.google.GoogleStorageDruidModule.getGoogleStorage(GoogleStorageDruidModule.java:114) at org.apache.druid.storage.google.GoogleStorageDruidModule.getGoogleStorage(GoogleStorageDruidModule.java:114) (via modules: com.google.inject.util.Modules$OverrideModule -> org.apache.druid.storage.google.GoogleStorageDruidModule) while locating org.apache.druid.storage.google.GoogleStorage 1 error at [Source: (org.eclipse.jetty.server.HttpInputOverHTTP); line: 1, column: 180] (through reference chain: org.apache.druid.indexing.overlord.sampler.IndexTaskSamplerSpec["spec"]->org.apache.druid.indexing.common.task.IndexTask$IndexIngestionSpec["ioConfig"]->org.apache.druid.indexing.common.task.IndexTask$IndexIOConfig["inputSource"]) A case reported on this matter caught my attention. But I can not see any verified solution to that case. Please help me.
We want to take data from GCP to on prem Druid. We don’t want to take cluster in GCP. So that we want solve this problem.
...ANSWER
Answered 2022-Jan-11 at 19:38You must define the GOOGLE_APPLICATION_CREDENTIALS that points to a file path, and not contain the file content.
In a cluster (like Kubernetes), it's usual to mount a volume with the file in it, and to se the env var to point to that volume.
QUESTION
At the moment my code has multiple if statements that are similar (see below) and i was wondering if there was a way to make a variable or something that can change based on what comes out of the random.choice?
So if it landed on druid instead of checking if the result was barbarian then moving onto the next block of code it would just take druid from the random.choice output and change the import for a single block of code accordingly
sorry if this is worded badly, it's hard for me to convey what i mean, i can elaborate if needed
...ANSWER
Answered 2022-Jan-09 at 19:06You can use python's dict as a hash-map in order to avoid those ifs:
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