VSB-TUO/Make Solr heap tunable via SOLR_HEAP (backport #1309)

[jr-rk]

Problem

The Solr heap in docker/docker-compose-rest.yml is hardcoded to -m 4g. With
-XX:+AlwaysPreTouch the container commits the full 4 GB on start — wasteful on shared dev
hosts running several DSpace stacks, and not lowerable without editing a tracked file.

Backport of #1309 to customer/vsb-tuo.
Tracking issue: dataquest-dev/dspace-customers#746

Change set

Single-line change to the dspacesolr entrypoint in docker/docker-compose-rest.yml:

-      exec solr -p ${SOLR_PORT} -f -m 4g
+      exec solr -p ${SOLR_PORT} -f -m "${SOLR_HEAP:-4g}"

Translated, not cherry-picked (per the FE backport model). On this branch (7.6.5 family) the Solr launch uses -p ${SOLR_PORT},
so only the -m 4g argument changed; the port and every other line are untouched. The value
is quoted to survive word-splitting, matching the source PR follow-up.

Out of scope: the default heap value (stays 4g), other services, ports, Solr image/version,
and AlwaysPreTouch.

Test evidence

• Post-change marker present (line 149): -m "${SOLR_HEAP:-4g}"
• Pre-change marker -m 4g no longer present (grep count 0)
• Compose YAML re-parses cleanly (yaml.safe_load); edit sits inside the entrypoint scalar
• Default/override: SOLR_HEAP unset -> 4g, SOLR_HEAP=1g -> 1g

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 93a308e3-992a-4816-8437-f75c338bf0e6

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}