Why does G1GC log "humongous allocation request failed"?

Solution Verified - Updated -

Issue

  • We see the following messages in our error log followed by a Full GC:
 87080.686: [G1Ergonomics (Heap Sizing) attempt heap expansion, reason: humongous allocation request failed, allocation request: 531476496 bytes]
 87080.686: [G1Ergonomics (Heap Sizing) expand the heap, requested expansion amount: 318767104 bytes, attempted expansion amount: 318767104 bytes]
 87080.686: [G1Ergonomics (Heap Sizing) did not expand the heap, reason: heap expansion operation failed]

Environment

  • Java using G1GC

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