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  1. Core Server
  2. SERVER-23625

Some read-only operations (eg count,aggregate) hang indefinitely if the primary for the shard is unreachable from mongos

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    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Sharding
    • None
    • ALL
    • Sharding 2019-02-25

      Even if you specify a 'secondary' read preference, we still try to call setShardVersion on the primary when running count, agg, m/r, etc. If the replica set monitor has already detected that the primary is unreachable then we skip the setShardVersion call and it works. If we have not yet detected that the node we knew to once be primary has since become unreachable, we'll try to send setShardVersion to it, and that will hang forever.

        1. primary_shard_server_blackholed_from_mongos.js
          2 kB
          Spencer Brody

            Assignee:
            blake.oler@mongodb.com Blake Oler
            Reporter:
            spencer@mongodb.com Spencer Brody (Inactive)
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              Created:
              Updated:
              Resolved: