nikhilvavs commented on issue #748: Huge CPU spike after upgrading from 0.8.2 to 0.8.4 URL: https://github.com/apache/helix/issues/748#issuecomment-585063817 We took flame graphs of the CPU with and without the upgraded version. The upgraded version had 25.7% samples from `org/apache/helix/common/DedupEventProcessor.run` compared to 3.23% in the normal revision. **Flame graph from 0.8.2:** Although not very clear from this image, the small box next to `java/lang/Thread.run` (second row from bottom) is the box corresponding to helix code  **Flame graph from the upgraded version (0.8.4):** You can see a significant increase in the number of samples in `DedupEventProcessor.run`  **Flame graph zoomed in on details with helix (version 0.8.4):**  Apologies for not being able to attach the complete svg. We checked the commits in `DedupEventProcessor.java` and saw that the commit was introduced in 0.8.3. (It may have been some other function inside as well.)
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