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getShardDistribution does not properly support sharded timeseries collections

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    • Type: Icon: Bug Bug
    • Resolution: Works as Designed
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 6.0.2
    • Component/s: None
    • Sharding EMEA
    • ALL
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      1. Create a shareded timeseries collection
      2. Invoke getShardedDistribution() against the namespace - this will return "Collection ts is not sharded"
      3. Invoke getShardedDistribution() against the corresponding system.buckets.ts collection - this will yield NaN for docs per chunk and docs (total)

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      1. Create a shareded timeseries collection 2. Invoke getShardedDistribution() against the namespace - this will return "Collection ts is not sharded" 3. Invoke getShardedDistribution() against the corresponding system.buckets.ts collection - this will yield NaN for docs per chunk and docs (total)
    • Sharding EMEA 2023-04-17, Sharding EMEA 2023-05-01, Sharding EMEA 2023-05-15

      As of v6.0.2 the getShardDistribution() is not able to recognize a sharded timeseries collection:

      [direct: mongos] test> db.weather.getShardDistribution()
MongoshInvalidInputError: [SHAPI-10001] Collection weather is not sharded

      If invoked against the buckets collection, this will show some details, but a number of fields yield NaN:

      [direct: mongos] test> db.system.buckets.weather.getShardDistribution()
Shard shard01 at shard01/localhost:27018
{
  data: '718B',
  docs: undefined,
  chunks: 1,
  'estimated data per chunk': '718B',
  'estimated docs per chunk': NaN
}
---
Totals
{
  data: '718B',
  docs: NaN,
  chunks: 1,
  'Shard shard01': [ '100 % data', 'NaN % docs in cluster', '0B avg obj size on shard' ]
}

      This appears to be an oversight as the expectation is that getShardDistribution() should be able to recognize a sharded timeseries collection.

            Assignee:
            antonio.fuschetto@mongodb.com Antonio Fuschetto
            Reporter:
            dmitry.ryabtsev@mongodb.com Dmitry Ryabtsev
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              Created:
              Updated:
              Resolved: