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  1. Core Server
  2. SERVER-4177

make multi-shard retrying due to stale versions smarter

    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Sharding
    • None

      In general, when doing multi-shard operations which depend on versions, if a single or only two shards have incorrect versions the command / query needs to be retried on all shards. This is not usually necessary, and can cause unnecessary load if the command is costly (like mapreduce).

      Fix : figure out which shards we need to refresh, just retry commands on those servers. This wouldn't totally eliminate the problem (if detected a version change on one shard but not the other after a migrate, for example), but would make it much less likely.

            Assignee:
            Unassigned Unassigned
            Reporter:
            greg_10gen Greg Studer
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