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Type: Improvement
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Resolution: Fixed
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Priority: Major - P3
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Affects Version/s: None
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Component/s: Checkpoints
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Storage Engines
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8
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2023-06-27 Lord of the Sprints, 2023-07-11 WiredTractor, 2023-07-25 Absolute unit, StorEng - 2023-08-08, ASeasonTooMany-2023-08-22
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Needed
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Triage and Release
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Checkpointing is one of the most user-visibly disruptive maintenance operations WiredTiger does. Sometimes a lot of time is spent doing checkpoints, and it isn't clear what it is doing with that time.
We should add metrics and/or log lines that give better insight.
An example from a customer shows checkpoints completing in between 15 and 20 minutes, spending 4 minutes of that time writing content (2 at the start, 2 at the end), with no meaningful indication of what happens for the remaining 11 to 16 minutes. There is no meaningful time being spent flushing checkpoint content to disk.
A starting point for this is probably building or finding a workload that takes a long time to create a new checkpoint.
- causes
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WT-12363 Concurrent checkpoint can produce misleading stats
- Closed