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Ran 27 Sep 2018 08:55AM UTC

Files 1012

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Committed 27 Sep 2018 08:55AM UTC coverage: 80.563% (+1.8%) from 78.753%

Job # 1078.1

Build Type

push

jenkins

Committed by ravipesala

Commit Message

[HOTFIX] Fix NPE in LRU cache when entry from the same table is getting evicted to load another entry from same table

Problem
When driver LRU cache size is configured to a small value then on running concurrent queries sometimes while loading the block dataMap in LRU cache one of the dataMap entries from the same table is getting deleted because of shortage of space. Due to this in the flow after loading the dataMap cache NPE is thrown.
This is because when an cacheable entry is removed from LRU cache then invalidate is called on that cacheable entry to clear the unsafe memory used by that entry. Invalidate method makes the references null and clears the unsafe memory which leads to NPE when accessed again.

Solution
Currently dataMap cache uses unsafe offheap memory for datamap caching. To avoid this the code is modified to use unsafe with onheap so that JVM itself takes care of clearing the memory when required. We do not require to explicitly set the references to null.

This closes #2759

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