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  1. WiredTiger
  2. WT-9658

Add visible statistics for s3_store module



    • StorEng - Refinement Pipeline


      We want to be able to track actual S3 requests (size of requests, how many, is input/output, cached or not) and have them appear as WT statistics.  Right now many of these things are being tracked and reported via a logging mechanism.  We really want it tracked in a standard way that can be accessed directly via statistics cursors and pushed into time series files that can be examined by t2.

      TBD on whether we want to make a general solution for extension statistics, or something more specific that models perhaps current file system statistics. Read/write to disk storage already has counter, size and latency stats, so maybe there's a way we can reorganize software (abstract out the "I/O stats collection"so it can be used by both.  Note that the S3_store I/O calls are triggered indirectly by a WT_STORAGE_SOURCE->ss_flush call, it is not the individual WT_FILE->write calls that cause the S3 transfer to happen.


      • This came out of discussions with steve.kuhn@mongodb.com and keith.smith@mongodb.com.  We want to make technical and product decisions based on real data.  The data to be collected by microbenchmarks in PM-2524 touch the surface of what we need.

      Acceptance Criteria (Definition of Done)
      Ideally, we'd have the ability to look at number and size of S3 put/get calls along with latency and access this with statistics cursors and t2.  We'll need some simply (probably python) tests to show this - at least the statistics cursors part.




            backlog-server-storage-engines Backlog - Storage Engines Team
            donald.anderson@mongodb.com Donald Anderson
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