[SERVER-42011] Create concurrency suites to enable WiredTiger eviction debugging mode Created: 28/Jun/19 Updated: 29/Oct/23 Resolved: 21/Aug/19 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | Storage, WiredTiger |
| Affects Version/s: | None |
| Fix Version/s: | 4.3.1 |
| Type: | Task | Priority: | Major - P3 |
| Reporter: | Eric Milkie | Assignee: | Louis Williams |
| Resolution: | Fixed | Votes: | 1 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Backwards Compatibility: | Fully Compatible | ||||||||||||||||
| Sprint: | Execution Team 2019-08-12, Execution Team 2019-08-26 | ||||||||||||||||
| Participants: | |||||||||||||||||
| Linked BF Score: | 52 | ||||||||||||||||
| Description |
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| Comments |
| Comment by Githook User [ 21/Aug/19 ] |
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Author: {'name': 'Louis Williams', 'email': 'louis.williams@mongodb.com', 'username': 'louiswilliams'}Message: |
| Comment by Maria van Keulen [ 19/Aug/19 ] |
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Thanks for the clarification, max.hirschhorn. If we're interested in testing the interaction between debug builds and eviction debugging, perhaps we could add the new concurrency suites but only run them on debug builds. |
| Comment by Susan LoVerso [ 19/Aug/19 ] |
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We haven't done a side-by-side performance comparison but this additional debugging isn't just additional checking. The eviction debug mode changes algorithms to force more lookaside behavior. It would likely be a more noticeable impact than other debug-style checking. I would probably suggest being a bit more selective in turning it on, at least initially. Some tests or workloads may stress eviction more than others so the impact will vary. |
| Comment by Louis Williams [ 15/Aug/19 ] |
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sue.loverso, how expensive is this eviction debugging? Making new concurrency suites just to enable these debug checks doesn't make sense to me without testing any additional features. Could we just enable this in all debug builds? Our debug builds already perform additional runtime checks, and are often slower than other builds. |
| Comment by Max Hirschhorn [ 03/Aug/19 ] |
maria.vankeulen, the mutational (jstestfuzz) fuzzer is only able to detect cases where the server crashes, hangs, or corrupts data. In particular, it won't detect data correctness issues because it makes no assertions about the server's response. My impression for |
| Comment by Maria van Keulen [ 01/Aug/19 ] |
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Based on my understanding of |