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### What changes were proposed in this pull request? Use WeakReference not SoftReference in LevelDB ### Why are the changes needed? (See discussion at https://github.com/apache/spark/pull/28769#issuecomment-906722390 ) "The soft reference to iterator introduced in this pr unfortunately ended up causing iterators to not be closed when they go out of scope (which would have happened earlier in the finalize) This is because java is more conservative in cleaning up SoftReference's. The net result was we ended up having 50k files for SHS while typically they get compacted away to 200 odd files. Changing from SoftReference to WeakReference should make it much more aggresive in cleanup and prevent the issue - which we observed in a 3.1 SHS" ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Existing tests Closes #33859 from srowen/SPARK-36603. Authored-by: Sean Owen <srowen@gmail.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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