mirror of https://github.com/apache/druid.git
181 lines
7.9 KiB
Markdown
181 lines
7.9 KiB
Markdown
---
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layout: doc_page
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title: "Tutorial: Deleting data"
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---
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<!--
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~ Licensed to the Apache Software Foundation (ASF) under one
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~ or more contributor license agreements. See the NOTICE file
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# Tutorial: Deleting data
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This tutorial demonstrates how to delete existing data.
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For this tutorial, we'll assume you've already downloaded Apache Druid (incubating) as described in
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the [single-machine quickstart](index.html) and have it running on your local machine.
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## Load initial data
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In this tutorial, we will use the Wikipedia edits data, with an indexing spec that creates hourly segments. This spec is located at `quickstart/tutorial/deletion-index.json`, and it creates a datasource called `deletion-tutorial`.
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Let's load this initial data:
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```bash
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bin/post-index-task --file quickstart/tutorial/deletion-index.json --url http://localhost:8081
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```
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When the load finishes, open [http://localhost:8888/unified-console.html#datasources](http://localhost:8888/unified-console.html#datasources) in a browser.
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## How to permanently delete data
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Permanent deletion of a Druid segment has two steps:
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1. The segment must first be marked as "unused". This occurs when a user manually disables a segment through the Coordinator API.
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2. After segments have been marked as "unused", a Kill Task will delete any "unused" segments from Druid's metadata store as well as deep storage.
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Let's drop some segments now, by using the coordinator API to drop data by interval and segmentIds.
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## Disable segments by interval
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Let's disable segments in a specified interval. This will mark all segments in the interval as "unused", but not remove them from deep storage.
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Let's disable segments in interval `2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z` i.e. between hour 18 and 20.
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```bash
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curl -X 'POST' -H 'Content-Type:application/json' -d '{ "interval" : "2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z" }' http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
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```
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After that command completes, you should see that the segment for hour 18 and 19 have been disabled:
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Note that the hour 18 and 19 segments are still present in deep storage:
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```bash
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$ ls -l1 var/druid/segments/deletion-tutorial/
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2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
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2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
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2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
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2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
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2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
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2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
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2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
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2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
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2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
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2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
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2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
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2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
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2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
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2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
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2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
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2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
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2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
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2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
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2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
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2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
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2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
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2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
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2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
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2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
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```
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## Disable segments by segment IDs
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Let's disable some segments by their segmentID. This will again mark the segments as "unused", but not remove them from deep storage. You can see the full segmentID for a segment from UI as explained below.
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In the [segments view](http://localhost:8888/unified-console.html#segments), click the arrow on the left side of one of the remaining segments to expand the segment entry:
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The top of the info box shows the full segment ID, e.g. `deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-02-28T01:11:51.606Z` for the segment of hour 14.
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Let's disable the hour 13 and 14 segments by sending a POST request to the Coordinator with this payload
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```json
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{
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"segmentIds":
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[
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"deletion-tutorial_2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z_2019-05-01T17:38:46.961Z",
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"deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-05-01T17:38:46.961Z"
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]
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}
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```
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This payload json has been provided at `quickstart/tutorial/deletion-disable-segments.json`. Submit the POST request to Coordinator like this:
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```bash
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curl -X 'POST' -H 'Content-Type:application/json' -d @quickstart/tutorial/deletion-disable-segments.json http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
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```
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After that command completes, you should see that the segments for hour 13 and 14 have been disabled:
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Note that the hour 13 and 14 segments are still in deep storage:
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```bash
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$ ls -l1 var/druid/segments/deletion-tutorial/
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2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
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2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
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2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
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2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
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2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
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2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
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2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
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2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
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2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
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2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
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2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
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2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
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2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
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2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
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2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
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2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
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2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
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2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
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2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
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2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
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2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
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2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
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2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
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2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
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```
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## Run a kill task
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Now that we have disabled some segments, we can submit a Kill Task, which will delete the disabled segments from metadata and deep storage.
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A Kill Task spec has been provided at `quickstart/tutorial/deletion-kill.json`. Submit this task to the Overlord with the following command:
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```bash
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curl -X 'POST' -H 'Content-Type:application/json' -d @quickstart/tutorial/deletion-kill.json http://localhost:8081/druid/indexer/v1/task
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```
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After this task completes, you can see that the disabled segments have now been removed from deep storage:
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```bash
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$ ls -l1 var/druid/segments/deletion-tutorial/
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2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
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2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
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2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
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2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
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2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
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2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
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2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
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2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
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```
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