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I recently updated to MongoDB version 7. I am using a sharded cluster with PSA (PRIMARY-SECONDARY-ARBITER) shards. The arbiter not is constantly writing every second this warning into to log:
{
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"t": {
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"$date": "2024-01-17T07:47:12.004+01:00"
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},
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"s": "W",
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"c": "QUERY",
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"id": 23799,
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"ctx": "ftdc",
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"msg": "Aggregate command executor error",
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"attr": {
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"error": {
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"code": 26,
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"codeName": "NamespaceNotFound",
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"errmsg": "Unable to retrieve storageStats in $collStats stage :: caused by :: Collection [local.oplog.rs] not found."
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},
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"stats": {},
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"cmd": {
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"aggregate": "oplog.rs",
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"cursor": {},
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"pipeline": [
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{
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"$collStats": {
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"storageStats": {
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"waitForLock": false,
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"numericOnly": true
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}
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}
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}
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],
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"$db": "local"
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}
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}
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}
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It does not have a big impact, because the ARBITER does not store any data. However, it is filling up the logfile, I get every day a logfile of 55MB.
I don't think a permanent warning should be part of a normally running mongod process
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