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Type:
New Feature
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Fully Compatible
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Query Optimization 2021-02-22, Query Optimization 2021-03-08, Query Optimization 2021-03-22, Query Optimization 2021-04-05, Query Optimization 2021-04-19
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3
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As part of a resharding operation we issue a pipeline with a $sort followed by a $lookup on config.cache.chunks. For efficiency and resumability, we need each shard to provide things in a sorted order and also perform the $lookup. Today this doesn't work because the $sort forces a split of a sharded pipeline and does not push the $lookup into the shards part. For this particular $lookup, we know it is safe to run it in parallel, so we should be able to push it into the shards pipeline.
- causes
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SERVER-57164 Invariant failure in a $group-by-variable optimization
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- Closed
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- is depended on by
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SERVER-53940 Support resuming resharding collection cloning for sharded collections with non-simple default collations
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- Closed
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- is related to
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SERVER-26442 Push $sort before $project and $addFields
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- Open
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- related to
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- Backlog
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