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  1. Core Server
  2. SERVER-33538

mapReduce "replace" on a sharded output collection can lead to UUIDCatalog inconsistencies

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    • Minor Change
    • ALL
    • v4.0
    • Storage NYC 2018-03-26, Sharding 2018-05-21, Sharding 2018-06-04
    • 60

    Description

      mapReduce with a sharded output collection assigns the UUID obtained from the config server to the final output collection. mapReduce "replace" will drop the existing output collection, which has the same UUID as the new output collection. Two-phase-drop may cause the dropCollection to finish after the renameCollection finishes, erroneously removing the UUIDCatalog entry for the output collection.

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          is documented by

          Task - A task that needs to be done. DOCS-11731 Docs for SERVER-33538: mapReduce "replace" on a sharded output collection can lead to UUIDCatalog inconsistencies

          • Major - P3 - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-33599 Out collection not in UUID catalog when shards started as replica sets in mapReduce_outSharded.js, mrShardedOutput.js, forget_mr_temp_ns.js

          • Major - P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. SERVER-35425 After a map reduce an exception NamespaceNotFound happens in a secondary shard

          • Major - P3 - Major loss of function.
          • Closed
          related to

          Task - A task that needs to be done. SERVER-34539 Re-enable sharded mapReduce concurrency testing and only use a single mongos

          • Major - P3 - Major loss of function.
          • Closed

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              janna.golden@mongodb.com Janna Golden
              maria.vankeulen@mongodb.com Maria van Keulen
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              Dates

                Created:
                Updated:
                Resolved: