mirror of https://github.com/zulip/zulip.git
104 lines
3.1 KiB
Markdown
104 lines
3.1 KiB
Markdown
# Full-text search
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Zulip supports full-text search, which can be combined arbitrarily
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with Zulip's full suite of narrowing operators. By default, it only
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supports English text, but there is an experimental
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[PGroonga](https://pgroonga.github.io/) integration that provides
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full-text search for all languages.
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The user interface and feature set for Zulip's full-text search is
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documented in the "Search operators" documentation section in the Zulip
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app's gear menu.
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## The default full-text search implementation
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Zulip's uses [PostgreSQL's built-in full-text search
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feature](https://www.postgresql.org/docs/current/textsearch.html),
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with a custom set of English stop words to improve the quality of the
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search results.
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In order to optimize the performance of delivering messages, the
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full-text search index is updated for newly sent messages in the
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background, after the message has been delivered. This background
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updating is done by
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`puppet/zulip/files/postgresql/process_fts_updates`, which is usually
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deployed on the database server, but could be deployed on an
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application server instead.
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## Multi-language full-text search
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Zulip also supports using [PGroonga](https://pgroonga.github.io/) for
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full-text search. While PostgreSQL's built-in full-text search feature
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supports only one language at a time (in Zulip's case, English), the
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PGroonga full-text search engine supports all languages
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simultaneously, including Japanese and Chinese. Once we have tested
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this new backend sufficiently, we expect to switch Zulip deployments
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to always use PGroonga.
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### Enabling PGroonga
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All steps in this section should be run as the `root` user; on most installs, this can be done by running `sudo -i`.
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1. Alter the deployment setting:
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```bash
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crudini --set /etc/zulip/zulip.conf machine pgroonga enabled
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```
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1. Update the deployment to respect that new setting:
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```bash
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/home/zulip/deployments/current/scripts/zulip-puppet-apply
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```
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1. Edit `/etc/zulip/settings.py`, to add:
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```python
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USING_PGROONGA = True
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```
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1. Apply the PGroonga migrations:
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```bash
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su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga'
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```
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Note that the migration may take a long time, and users will be
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unable to send new messages until the migration finishes.
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1. Once the migrations are complete, restart Zulip:
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```bash
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su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
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```
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### Disabling PGroonga
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1. Remove the PGroonga migration:
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```bash
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su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga zero'
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```
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If you intend to re-enable PGroonga later, you can skip this step,
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at the cost of your Message table being slightly larger than it would
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be otherwise.
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1. Edit `/etc/zulip/settings.py`, editing the line containing `USING_PGROONGA` to read:
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```python
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USING_PGROONGA = False
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```
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1. Restart Zulip:
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```bash
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su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
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```
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1. Finally, remove the deployment setting:
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```bash
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crudini --del /etc/zulip/zulip.conf machine pgroonga
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```
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