[GitHub] [ozone] duongkame commented on pull request #3754: HDDS-7199. Implement new mix workload Read/Write Freon command which meets specific test requirements

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duongkame commented on PR #3754:
URL: https://github.com/apache/ozone/pull/3754#issuecomment-1284634984

   
   > Code can continue testing and add a metric at the end for successful reads vs. not found read. It is a valid test to look at the performance of OM to report a key does not exist. Object Stores can be bombarded with nonexistent keys, and the performance of the underlying storage to report keys that don't exist is important. LSM tree-based storage has to scan all levels before reporting a key as not found and in some ways represents the worst case performance at scale.
   
   agree, reading nonexistent keys is a valid test case and the tool should support it deterministically. To do that, it has to know (on its own) which key exists and which doesn't. Warp does that by having a pre-test phase in which warp creates a set of keys (10K or so) and keeps the created keys in memory for the real read test.
   
   We can also do the same for this tool, by maintaining a set of known keys that can be initialized by a pretest phase and grows with the write test.


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