Difference between revisions of "ElasticSearch"
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[https://github.com/elastic/elasticsearch GitHub] | [https://github.com/elastic/elasticsearch GitHub] | ||
| − | == Install == | + | ==Install== |
| − | * Install Java <syntaxhighlight lang="bash"> | + | *Install Java <syntaxhighlight lang="bash"> |
sudo apt install openjdk-7-jre-headless | sudo apt install openjdk-7-jre-headless | ||
</syntaxhighlight><br /> | </syntaxhighlight><br /> | ||
| Line 11: | Line 11: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | == API == | + | ==API== |
Get status<syntaxhighlight lang="bash"> | Get status<syntaxhighlight lang="bash"> | ||
curl -X GET "http://localhost:9200" | curl -X GET "http://localhost:9200" | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | == Paths == | + | == Configuration == |
| + | cluster.name | ||
| + | |||
| + | node.name | ||
| + | |||
| + | index.number_of_shards | ||
| + | |||
| + | index.number_of_replicas | ||
| + | |||
| + | node.master | ||
| + | |||
| + | node.data | ||
| + | |||
| + | ===Paths=== | ||
{| class="wikitable" | {| class="wikitable" | ||
|+ | |+ | ||
Revision as of 08:18, 15 April 2019
Install
- Install Java
sudo apt install openjdk-7-jre-headless
Download Debian package from elastic.co
sudo dpkg -i elasticsearch-X.X.X.deb
API
Get status
curl -X GET "http://localhost:9200"
Configuration
cluster.name
node.name
index.number_of_shards
index.number_of_replicas
node.master
node.data
Paths
| Type | Description | Location (Debian) |
|---|---|---|
| Home | Home of Elastic Search Installation | /usr/share/elasticsearch |
| Bin | Binary scripts including elasticsearch to start a node | /usr/share/elasticsearch/bin |
| Conf | Configuration file elasticsearch.yml | /etc/elasticsearch |
| data | The location of the data files of each index or shard allocated on the node | /etc/elasticsearch |
| logs | Log file location | /var/log/elasticsearch |
| plugins | Plugin directories location | /usr/share/elasticsearch/plugins |
Plugins
Site Plugins
- Head: Swiss Army Knife for ElasticSearch cluster topology & cluster status, table views & API frontend views
- BigDesk: Statistics, charts
- Kopf: Cluster administration & query tool
Analysis Plugins
- SmartCN: Analyze Chinese text
QueryDSL vs RDMBS
| Elastic Search | RDMBS |
|---|---|
| Index | Database |
| Type | Table |
| Document | Row |
| Field | Column |
| Mapping | Schema |
| Query DSL | SQL |
| Get API | Select * FROM |
| POST API | UPDATE <TABLE> SET |
| PUT API | INSERT INTO <TABLE> |
| Everything is indexed | Index on demand |
| Aggregation | SELECT <FIELD>, COUNT (*) FROM <TABLE> |