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  1. Core Server
  2. SERVER-76076

Investigate latency regressions in resharding workload while in catalog shard mode

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    • Icon: Improvement Improvement
    • Resolution: Gone away
    • Icon: Major - P3 Major - P3
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    • Sharding NYC
    • Sharding NYC 2023-06-12

    Description

      As part of SERVER-74266 we ran a genny workload patch with catalog shard mode on for the `shard` and `shard-single` suites. The results of the patch can be found here: https://spruce.mongodb.com/version/64346dd05623438f7351377a/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

      Using the performance analyzer tool to analyze the patch, we found that the reshard_collection_mixed workload had the largest regressions in terms of latencies. More specifically there were significant regressions in the 99th percentile latencies for reads and writes to a collection being resharded. 

      The following is a mini-writeup with more details on the genny workload patch and the specific regressions noticed: https://docs.google.com/document/d/1eAioYLvz_haug2RkRx-5e9Dlscw-nT8xQ70WNWmkSag/edit?usp=sharing

      Someone with knowledge on resharding should investigate these regressions and see if there is anything that needs to be fixed or improved. 

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            wenqin.ye@mongodb.com Wenqin Ye
            wenqin.ye@mongodb.com Wenqin Ye
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