mirror of https://github.com/apache/druid.git
179 lines
7.9 KiB
Markdown
179 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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~ regarding copyright ownership. The ASF licenses this file
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~ to you under the Apache License, Version 2.0 (the
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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 Druid 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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Completing [Tutorial: Configuring retention](../tutorials/tutorial-retention.html) first is highly recommended, as we will be using retention rules in this tutorial.
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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
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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 segment is dropped by retention rules, and when a user manually disables a segment through the Coordinator API. This tutorial will cover both cases.
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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, first with load rules, then manually.
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## Drop some data with load rules
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As with the previous retention tutorial, there are currently 24 segments in the `deletion-tutorial` datasource.
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click the blue pencil icon next to `Cluster default: loadForever` for the `deletion-tutorial` datasource.
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A rule configuration window will appear.
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Now click the `+ New rule` button twice.
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In the upper rule box, select `Load` and `by interval`, and then enter `2015-09-12T12:00:00.000Z/2015-09-13T00:00:00.000Z` in field next to `by interval`. Replicants can remain at 2 in the `_default_tier`.
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In the lower rule box, select `Drop` and `forever`.
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Now click `Next` and enter `tutorial` for both the user and changelog comment field.
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This will cause the first 12 segments of `deletion-tutorial` to be dropped. However, these dropped segments are not removed from deep storage.
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You can see that all 24 segments are still present in deep storage by listing the contents of `apache-druid-#{DRUIDVERSION}/var/druid/segments/deletion-tutorial`:
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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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## Manually disable a segment
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Let's manually disable a segment now. This will mark a segment as "unused", but not remove it from deep storage.
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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 14 segment by sending the following DELETE request to the Coordinator, where {SEGMENT-ID} is the full segment ID shown in the info box:
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```bash
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curl -XDELETE http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/segments/{SEGMENT-ID}
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```
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After that command completes, you should see that the segment for hour 14 has been disabled:
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Note that the hour 14 segment is 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:8090/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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2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
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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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