Memory leak in Infinispan QueryResultsRegionImpl for cacheable Hibernate queries executed outside a transaction in JBoss EAP

Environment

• Red Hat JBoss Enterprise Application Platform (EAP) 7.2
• Infinispan 9.3

Issue

• Defined a cacheable query

  @NamedQuery(name = "EmployeeQuery", query = "FROM Employee e WHERE e.name = :name",
      hints = { @QueryHint(name = "org.hibernate.cacheable", value = "true") }
  )
  

• Executing the query outside a transaction

• Memory usage grows with each query execution as indicated by heap analysis

  Class Name                                                                 | Shallow Heap | Retained Heap | Percentage
  -----------------------------------------------------------------------------------------------------------------------
  org.infinispan.hibernate.cache.v53.impl.QueryResultsRegionImpl @ 0xb7316a80|           56 | 1,024,011,584 |     96.55%
  |- java.util.concurrent.ConcurrentHashMap @ 0xb7316af0                     |           64 | 1,024,011,472 |     96.55%
  |  '- java.util.concurrent.ConcurrentHashMap$Node[524288] @ 0xe0fe2800     |    2,097,168 | 1,024,011,408 |     96.55%
  |     |- java.util.concurrent.ConcurrentHashMap$Node @ 0xbcf1df60          |           32 |        24,672 |      0.00%
  |     |- java.util.concurrent.ConcurrentHashMap$Node @ 0xbcd40238          |           32 |        24,672 |      0.00%
  |     |- java.util.concurrent.ConcurrentHashMap$Node @ 0xb2c1f750          |           32 |        24,672 |      0.00%
  |     |- java.util.concurrent.ConcurrentHashMap$Node @ 0xd707aef8          |           32 |        24,672 |      0.00%
  |     |- java.util.concurrent.ConcurrentHashMap$Node @ 0xbf1e04d0          |           32 |        20,560 |      0.00%
        ...
  -----------------------------------------------------------------------------------------------------------------------
  

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 defect (Content from issues.jboss.org is not included.ISPN-10323).

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