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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DOCS-11731 Docs for SERVER-33538: mapReduce "replace" on a sharded output collection can lead to UUIDCatalog inconsistencies
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- Closed
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- is duplicated by
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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
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- Closed
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- Closed
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- related to
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- Closed
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