Implement the aggregation stage $listClusterCatalog as an alias of the following pipeline (used to return the default values):
[
{ $_internalListCollections: {} },
{ $lookup: {
from: {
db: "config",
coll: "collections"
},
localField: "_id",
foreignField: "name",
as: "trackedCollectionInfo" }},
{ $addFields: {
"sharded": {
$and: [
{$ne: ["$trackedCollectionInfo", []]},
{$ne: [{$first: "$trackedCollectionInfo.unsplittable"}, true]}
]
} }},
{ $addFields: {
"shardKey": {
$cond: {
if: "$sharded",
then: {$first: "$trackedCollectionInfo.key"},
else: "$$REMOVE"
}
}
}}
]
In addition, the aggregation stage will also return additional values if they are requested through the stage specifications.
These are the extra fields that will be returned if the specified parameter is introduced:
| PARAMETER INTRODUCED | OPTIONAL FIELD | TYPE |
| {shards: 1} | shards | array of strings |
| {zoneRanges: 1} | zoneRanges | (opt) array of BSON |
| {chunksInfo:1} | chunks | (opt) array of BSON |
| {chunksInfo:1} | chunkSize | (opt) int |
| {balancingConfiguration: 1} | balancingEnabled | (opt) boolean |
| {balancingConfiguration: 1} | autoMergingEnabled | (opt) boolean |
| {tracked: 1} | tracked | bool |
- backported by
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SERVER-98652 [v8.0] Backport the $listClusterCatalog aggregation stage to v8.0
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- Closed
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- causes
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SERVER-102582 Disallow overriding readConcern on $listClusterCatalog
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- Closed
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- depends on
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- Closed
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- duplicates
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- Closed
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- fixes
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- Closed
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- is depended on by
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- Closed
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- Closed
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SERVER-89883 removeShard should hint about how to move data of tracked unsharded collections
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- Closed
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- is related to
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- Closed
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