Your Jira Upgrade Will Break 3 Things. Here’s How to Find Them First

A practical pre-upgrade checklist for Jira Data Center administrators who’ve been burned before (or don’t want to be).

I’ve been building tools for Jira DC admins for years, and every major upgrade cycle the pattern repeats. Plugins silently break. Performance degrades. The load balancer locks everyone out — including the admin trying to fix it.

So here’s what actually breaks during Jira DC upgrades, and how to find these problems before they find you.

The 3 Things That Break

Every upgrade failure I’ve seen falls into one of three categories:

1. Your apps — plugins that worked yesterday won’t work tomorrow
2. Your data — orphaned records, corrupted workflows, schema surprises
3. Your infrastructure — reindex timeouts, load balancer lockouts, NFS stale mounts

Let’s go through each one with specific checks you can run today.

1 Your Apps Will Break (and Some Won’t Tell You)

Apps are the #1 cause of upgrade failures. Not sometimes — consistently.

The silent killer pattern

An incompatible plugin in the installed-plugins folder can prevent Jira from starting at all. No error page. No admin console. Just… nothing. The only fix is emptying the plugins folder and reinstalling apps after Jira starts.

But that’s the obvious case. The worse scenario is when apps appear to work but silently malfunction. After one community member upgraded, the bundled Automation for Jira plugin started consuming extreme CPU. The upgrade “succeeded,” but the system was essentially DoS-ing itself.

What to check

Use the built-in compatibility checker:

Go to Administration > Manage Apps > scroll to Jira Update Check at the bottom. Select your target version and click “Check.”

ScriptRunner deserves special attention

If you use ScriptRunner, know that Groovy 4 introduced breaking changes that will silently break your scripts:

Also check for these deprecated Jira API patterns (not Groovy 4 specific, but commonly found in legacy scripts):

Empty objects in array lists (“a”,”b”,,”c”) are no longer allowed either. You need explicit empty strings (“a”,”b”,””,”c”).

The upgrade strategy that works

1. Before upgrading, disable all third-party plugins
2. Upgrade Jira first
3. Re-enable and upgrade plugins one at a time
4. After each re-enable, check atlassian-jira.log for errors
5. Run a full reindex only after all plugins are updated

This is slower than upgrading everything at once. That’s the point — you isolate which app caused which problem.

What Jira 11 changes for apps

This isn’t a minor version bump. Jira 11 introduces platform-level breaking changes that affect most third-party apps:

• Trusted Apps authentication removed entirely. If your integrations use Trusted Apps (common in older enterprise setups), they will stop working. Migrate to OAuth 2.0 with impersonation before upgrading.
• jQuery upgrade from 2 to 3. Every custom UI fragment, ScriptRunner behavior, and plugin that touches the frontend may break. jQuery Migrate removal is planned for Jira 12, so fixing jQuery 3 compatibility now avoids a second round of breakage.
• LESS web-resource transformer removed. Plugins using LESS runtime transformation will fail in Jira 11. The complete block on all plugins requiring transformation is planned for Jira 12.
• Global serialization filter. New blocklist for Java deserialization, Velocity, Struts, and XStream. Apps that relied on these serialization paths will fail silently.
• Apps must support Platform 6, 7, AND 8 simultaneously through 2026. This means some vendors may deprioritize Jira 11 support if their user base is still mostly on 10.x. Check with your vendors explicitly.

2 Your Data Has Problems You Don’t Know About

Every Jira instance accumulates data integrity issues over time. They’re harmless during normal operations but can cause upgrade failures when the database schema changes.

The queries that save upgrades

Run these before you upgrade. Each one takes seconds but can save hours of troubleshooting.

SELECT jiraissue.id, jiraissue.pkey,
       os_wfentry.*
FROM jiraissue
JOIN os_wfentry ON jiraissue.workflow_id = os_wfentry.id
WHERE os_wfentry.state IS NULL
OR os_wfentry.state = 0;

UPDATE os_wfentry
SET state = 1
WHERE id IN (
  SELECT os_wfentry.id
  FROM jiraissue
  JOIN os_wfentry ON jiraissue.workflow_id = os_wfentry.id
  WHERE os_wfentry.state IS NULL OR os_wfentry.state = 0
);

SELECT * FROM fieldconfigscheme fcs
WHERE NOT EXISTS (
  SELECT 1 FROM configurationcontext cc
  WHERE cc.fieldconfigscheme = fcs.id
)
AND fcs.fieldid LIKE 'customfield_%';

SELECT il.*
FROM issuelink il
LEFT JOIN jiraissue src ON il.source = src.id
LEFT JOIN jiraissue dst ON il.destination = dst.id
WHERE src.id IS NULL OR dst.id IS NULL;

SELECT * FROM project
WHERE id NOT IN (
  SELECT source_node_id FROM nodeassociation
  WHERE sink_node_entity = 'PermissionScheme'
);

SELECT jiraissue.id, jiraissue.issuenum,
       jiraissue.issuestatus, jiraissue.project
FROM jiraissue
JOIN os_currentstep currentStep
ON jiraissue.workflow_id = currentStep.entry_id
WHERE jiraissue.issuestatus IS NULL;

Know your numbers

Before upgrading, know exactly what you’re dealing with:

-- Total issues (critical for reindex time estimation)
SELECT count(*) FROM jiraissue;

-- Attachment volume per project (identifies bloat)
SELECT count(*),
       SUM(fa.filesize) / 1000000 as total_MB,
       p.pname, p.pkey
FROM project p
JOIN jiraissue j ON p.id = j.project
JOIN fileattachment fa ON fa.issueid = j.id
GROUP BY p.pname, p.pkey
ORDER BY total_MB DESC;

-- Custom field values per project (heavy projects slow reindex most)
SELECT count(*), p.pname, p.pkey
FROM jiraissue i
JOIN project p ON i.project = p.id
JOIN customfieldvalue cfv ON i.id = cfv.issue
GROUP BY p.pname, p.pkey
ORDER BY count(*) DESC;

3 Your Infrastructure Will Surprise You

Even if your apps are compatible and your data is clean, the infrastructure layer has its own set of traps.

The reindex reality

Major version upgrades typically require a full reindex. Starting with Jira 11.2, OpenSearch is fully production-supported as a search backend (Lucene public APIs are being deprecated, though Lucene itself remains supported for now), which means the search infrastructure is changing fundamentally.

Before upgrading, check this setting: Administration > System > Advanced Settings > look for the reindex thread count. If your hardware can handle it, increase the number of threads. Test in staging first.

Reindex stuck at 0%?

In DC clusters, this is almost always a stale NFS mount. The mount worked fine before the upgrade — the reboot during upgrade is what triggers it. The only fix is a server reboot. Check your NFS mount options. Recommended:

rw,nfsvers=4.1,lookupcache=pos,noatime,intr,rsize=32768,wsize=32768,_netdev

The load balancer lockout

Since Jira 8.19.1, when indexes are unhealthy, Jira responds “MAINTENANCE” to the /status endpoint. If your load balancer uses /status for health checks (it probably does), it will block all traffic — including your admin access.

You literally cannot log in to fix the problem that’s preventing you from logging in.

The Zero Downtime Upgrade trap

ZDU is great for minor version updates (10.1 to 10.3, for example). But it does not work between major versions (10.x to 11.x). If you try it, the upgraded node refuses to start with: “Jira does not support zero downtime upgrades between major releases.”

Post-upgrade performance: the invisible failure

Some upgrades “succeed” but performance degrades silently:

• entity_property table: After any upgrade, database index statistics may be outdated, causing the query optimizer to choose terrible execution plans. Run UPDATE STATISTICS (SQL Server) or VACUUM ANALYZE (PostgreSQL) on this table immediately post-upgrade.
• Automation for Jira CPU spike: The bundled plugin can consume extreme CPU after upgrade. Disabling it returns CPU to normal. Re-enable after verifying the rest of the system is stable.
• Basic Auth disabled by default in Jira 11. Your monitoring scripts, API integrations, and CI/CD pipelines that use basic authentication will silently stop working. They won’t fail loudly — they’ll just get 401 responses that may or may not be logged.

None of these show up in upgrade logs. You only notice when users start complaining — or when your Monday morning dashboard is empty.

The Pre-Upgrade Checklist

Here’s the condensed version. Print this. Pin it. Follow it every time.

If it fails

Don’t troubleshoot on a broken production system. Roll back immediately, then debug in staging. Rolling back means:

1. Stop Jira
2. Restore database from backup (native tools)
3. Restore installation and home directories
4. Start Jira on the old version

What’s New in Jira 11: The Full Breakage List

Here’s everything that changes when you upgrade from Jira 10 to 11. This isn’t meant to scare you — it’s meant to give you a checklist of what to verify.

Platform changes

Authentication and security

Search infrastructure

Plugin and UI changes

Lessons From Admins Who’ve Done This Before

These tips come from Atlassian Community veterans and Jira experts like Rodney Nissen (The Jira Guy) and Rachel Wright (Strategy for Jira). They’re not in official docs, but they should be.