Major Description
GridCacheMapEntry class rely on synchronized on itself heavily. In ATOMIC caches we lock multiple entries at once using Unsafe.monitorEnter/Exit methods. Unfortunately these methods were removed in Java 9. Recursion is not an option, as it would cause stack overflow for putAll operations with multiple entries.
Possible fixes:
1) Rework synchronized to ReentrantLock. Easy, but may cause additional memory pressure.
2) Have different implementations for Java 8 (synchronzied) and Java 9 (ReentrantLock) - much more complex solution, because we will require separate module for Java 8 and Java 9.
3) Rework ATOMIC caches, so that putAll operation updates entries one-by-one. As a side effect it will eliminate deadlocks.
Attachments
Issue Links
- Is contained by
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IGNITE-6728 Support Java 9
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- Resolved
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- links to
