Bug fix: NPE when adding event count in ParamMapBucket #494
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Describe what this PR does / why we need it
Fix the bug that NPE may occur when adding event count in ParamMapBucket. This is due to the concurrent operation for different values, causing old value eviction in LRU map.
Does this pull request fix one issue?
Fixes #493
Describe how you did it
Try to get the exact counter (though not strictly concise).
Describe how to verify it
Rerun the code snippet in #493. No NPE should occur.
Special notes for reviews
NONE