https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=43142
Bug ID: 43142
Summary: Elasticsearch number_of_replicas should be driven by a
system preference
Initiative type: ---
Sponsorship ---
status:
Product: Koha
Version: Main
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5 - low
Component: Searching - Elasticsearch
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Target Milestone: ---
Koha's index_config.yaml hardcodes index.number_of_replicas: 1 and
index.number_of_shards: 5. On single-node clusters (the vast majority of Koha
deployments), this causes a permanently yellow cluster health status because
replica shards can never be assigned.
The number_of_replicas setting is applied at index creation time during
rebuild_elasticsearch.pl. Since this is entirely within Koha's control, it
should be configurable via a system preference.
Proposed solution:
- Add a new system preference ElasticsearchReplicas (default: 0)
- rebuild_elasticsearch.pl and any index creation code should read this
preference and override the value from index_config.yaml
- Default of 0 is sensible because:
- Most deployments are single-node
- Replicas are only useful with multiple ES nodes
- Organizations that run multi-node clusters can set it to 1 or higher
- The setting takes effect on rebuild, so changing it is straightforward
This also eliminates the confusing yellow cluster health on fresh installs and
KTD development environments.
Note: The index_config.yaml default could also be changed to 0, with the
syspref allowing organizations to increase it. Either approach works, but the
syspref is the important part for operational control.
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