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  1. Core Server
  2. SERVER-21527

Race between remove shard and access to database may cause NULL pointer crash

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 3.2.0-rc3
    • Fix Version/s: None
    • Component/s: Sharding
    • Labels:
      None
    • Operating System:
      ALL
    • Sprint:
      Sharding C (11/20/15), Sharding D (12/11/15), Sharding E (01/08/16)

      Description

      ShardRegistry::getShard will return nullptr if the shard id is not found. In the steady state, the metadata should never contain a database which references a removed shard, because we drain the shard first and clear the cached metadata. However, in theory, there is a very narrow race condition where a query might be referencing a database entry, which points to a shard, which was just removed.

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                • Created:
                  Updated:
                  Resolved: