Performance issue with PersistentBag.equalsSnapshot() during query flush when using FlushMode.AUTO in Hibernate

Environment

• Red Hat JBoss Enterprise Application Platform (EAP) 7
• Hibernate 5

Issue

• Significant time is spent in PersistentBag.equalsSnapshot() during query flush when using FlushMode.AUTO if there large lists (e.g. for associations) referenced by entities touched during a transaction.

Resolution

This issue¹ is resolved in This content is not included.EAP 7.2 cumulative patch (CP) 4 and later releases. Production systems should use the latest available cumulative patch.

Root Cause

This is a known issue (Content from hibernate.atlassian.net is not included.HHH-11032).

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