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  1. Core Server
  2. SERVER-23097

Segfault on drop of source collection during MapReduce

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    Details

    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Backport Completed:
    • Steps To Reproduce:
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      1) run aggregation on a collection in parallel on multiple keys
      2) drop the target collection after completion

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      1) run aggregation on a collection in parallel on multiple keys 2) drop the target collection after completion
    • Sprint:
      Query 12 (04/04/16)
    • Linked BF Score:
      0

      Description

      Mongod process seems to sporadically causing segment errors while running mongo aggregation framework or/and right after completing the aggregation pipeline, most notably during dropping temp collections created as part of the aggregation framework.

      We run aggregation on multiple keys on a collection, we need unique counts for each of the field values, several aggregation pipelines are run in parallel and target collections are dropped after reading the results and writing the outputs to a unified collection [ done via map-reduce framework].

      The errors seem to be happening quite frequently - in dev and qa.

      Platform specs : Mongo Db version 3.2.1
      Storage Engine: WiredTiger
      OS :Linux version 3.13.0-74-generic (buildd@lcy01-07) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) )

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                • Created:
                  Updated:
                  Resolved: