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108 lines
3.7 KiB
Markdown
108 lines
3.7 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](http://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](http://www.postgresql.org/docs/current/static/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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We use a small extension,
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[tsearch_extras](https://github.com/zulip/tsearch_extras), for
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highlighting of the matching words. There is [some discussion of
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removing this extension, at least as an
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option](https://github.com/zulip/zulip/issues/467), so that Zulip can
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be used with database-as-a-service platforms.
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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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## An optional full-text search implementation
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Zulip now supports using [PGroonga](http://pgroonga.github.io/) for
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full-text search. PGroonga is a PostgreSQL extension that provides
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full-text search feature. PostgreSQL's built-in full-text search
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feature supports only one language at a time (in Zulip's case,
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English). PGroonga supports all languages simultaneously, including
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Japanese, Chinese and so on, all at once. We expect to migrate
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Zulip's full-text search to only support PGroonga once we have tested
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this new extension fully.
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The following processes should be executed as the root user. Run:
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sudo -i
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### How to enable full-text search across all languages
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This section describes how to enable using PGroonga to back the
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full-text search feature.
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To install PGroonga, add `pgroonga = enabled` in the `[machine]`
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section in `/etc/zulip/zulip.conf`:
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[machine]
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...
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pgroonga = enabled
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And then run as root:
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/home/zulip/deployments/current/scripts/zulip-puppet-apply
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Then, add `USING_PGROONGA = true` in `/etc/zulip/settings.py`:
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USING_PGROONGA = True
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And apply the PGroonga migrations:
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cd /srv/zulip
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./manage.py migrate pgroonga
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Note that the migration may take a long time, and you can't send new
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messages until the migration finishes.
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Once the migrations are complete, restart Zulip:
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su zulip -c /home/zulip/deployments/current/scripts/restart-server
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Now, you can use full-text search across all languages.
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### How to disable full-text search across all languages
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This section describes how to disable full-text search feature based
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on PGroonga.
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If you want to fully remove PGroonga, first you need to remove the
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PGroonga column (as above, this will take a long time and no messages
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can be sent while it is running). If you intend to re-enable PGroonga
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later, you can skip this step (at the cost of your Message table being
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slightly larger than it would be otherwise).
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/home/zulip/deployments/current/manage.py migrate pgroonga zero
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Then, set `USING_PGROONGA = False` in `/etc/zulip/settings.py`:
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USING_PGROONGA = False
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And, restart Zulip:
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su zulip -c /home/zulip/deployments/current/scripts/restart-server
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Now, full-text search feature based on PGroonga is disabled. If you'd
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like, you can also remove the `pgroonga = enabled` line in
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`/etc/zulip/zulip.conf` and uninstall the `pgroonga` packages.
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