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Type:
Improvement
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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: None
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Fully Compatible
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v4.4, v4.2, v4.0, v3.6
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Repl 2020-10-19, Repl 2020-11-16, Repl 2020-11-30
Improve the Initial Sync Progress Metrics.
Proposed new structure in ReplSetGetStatus:
New metrics in bold
"initialSyncStatus": {
"failedInitialSyncAttempts": 0,
"maxFailedInitialSyncAttempts": 10,
*approxTotalDataSize*
*approxTotalBytesCopied*
"initialSyncStart": ISODate("2019-12-04T05:12:35.719Z"),
*totalInitialSyncElapsedMillis*
*remainingInitialSyncEstimatedMillis*
"initialSyncAttempts": [],
"fetchedMissingDocs": 0,
"appliedOps": 0,
"initialSyncOplogStart": Timestamp(1575436355, 1),
"databases": {
*databasesToClone*
"databasesCloned": 2,
"admin": {
"collections": 4,
"clonedCollections": 4,
"start": ISODate("2019-12-04T05:12:35.947Z"),
"end": ISODate("2019-12-04T05:12:36.486Z"),
"elapsedMillis": 539,
"admin.system.roles":{
"documentsToCopy": 12,
"documentsCopied": 12,
*bytesToCopy*
*approxBytesCopied*
"indexes": 2,
"fetchedBatches": 1,
"start": ISODate("2019-12-04T05:12:35.950Z"),
"end": ISODate("2019-12-04T05:12:36.101Z"),
"elapsedMillis": 151,
"receivedBatches": 1
},
},
}
},
New Metrics Details
- totalInitialSyncElapsedMillis
- = Current Time - Start Time
- remainingInitialSyncEstimatedMillis
- = (totalInitialSyncElapsedMillis / approxTotalBytesCopied) * (approxTotalDataSize - approxTotalBytesCopied)
- If (approxBytesCopied == 0), this field will not be shown
- <collection>.bytesToCopy
- = collStats.size
- <collection>.approxBytesCopied
- = collStats.avgObjSize * documentsCopied
- databasesToClone
- = length of listDatabases response
- approxTotalDataSize
- = Sum (dbStats.dataSize for all databases)
- approxTotalBytesCopied
- = Sum (collection.approxBytesCopied for all collections)
Proposed changes to rs.status()
- Inherit changes to replSetGetStatus
- No changes to rs.status() specifically
Proposed changes to db.getReplicationInfo()
- No change, the current metrics are unrelated to initial sync
Proposed changes to rs.printReplicationInfo()
- No change, the current metrics are unrelated to initial sync
Proposed changes to rs.printSlaveReplicationInfo()
Current output:
When doing Initial Sync:
MongoDB Enterprise replset:PRIMARY> rs.printSlaveReplicationInfo() source: localhost:27018 syncedTo: Mon Apr 20 2020 12:38:47 GMT+0100 (WEST) 0 secs (0 hrs) behind the primary source: localhost:27019 syncedTo: Thu Jan 01 1970 01:00:00 GMT+0100 (CET) 1587382727 secs (440939.65 hrs) behind the primary
Suggested output:
MongoDB Enterprise replset:PRIMARY> rs.printSlaveReplicationInfo() source: localhost:27018 syncedTo: Mon Apr 20 2020 12:38:47 GMT+0100 (WEST) 0 secs (0 hrs) behind the primary source: localhost:27019 *InitialSyncSyncSource: <host:port>* *InitialSyncRemainingEstimatedDuration: “remainingInitialSyncEstimatedMillis” in X hours Y minutes*
- is related to
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SERVER-54266 Update tenant migration recipient currentOp output
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- Closed
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- related to
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SERVER-53017 replSetGetStatus remainingInitialSyncEstimatedMillis always 0
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- Closed
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- Closed
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- Backlog
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- Closed
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- mentioned in
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