Details
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Improvement
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Status: Closed
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Major - P3
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Resolution: Fixed
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None
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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
Description
Improve the Initial Sync Progress Metrics.
Proposed new structure in ReplSetGetStatus:
New metrics in bold
"initialSyncStatus": {
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"failedInitialSyncAttempts": 0,
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"maxFailedInitialSyncAttempts": 10,
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*approxTotalDataSize*
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*approxTotalBytesCopied*
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"initialSyncStart": ISODate("2019-12-04T05:12:35.719Z"),
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*totalInitialSyncElapsedMillis*
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*remainingInitialSyncEstimatedMillis*
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"initialSyncAttempts": [],
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"fetchedMissingDocs": 0,
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"appliedOps": 0,
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"initialSyncOplogStart": Timestamp(1575436355, 1),
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"databases": {
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*databasesToClone*
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"databasesCloned": 2,
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"admin": {
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"collections": 4,
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"clonedCollections": 4,
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"start": ISODate("2019-12-04T05:12:35.947Z"),
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"end": ISODate("2019-12-04T05:12:36.486Z"),
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"elapsedMillis": 539,
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"admin.system.roles":{
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"documentsToCopy": 12,
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"documentsCopied": 12,
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*bytesToCopy*
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*approxBytesCopied*
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"indexes": 2,
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"fetchedBatches": 1,
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"start": ISODate("2019-12-04T05:12:35.950Z"),
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"end": ISODate("2019-12-04T05:12:36.101Z"),
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"elapsedMillis": 151,
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"receivedBatches": 1
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},
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},
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}
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},
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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()
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source: localhost:27018
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syncedTo: Mon Apr 20 2020 12:38:47 GMT+0100 (WEST)
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0 secs (0 hrs) behind the primary
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source: localhost:27019
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syncedTo: Thu Jan 01 1970 01:00:00 GMT+0100 (CET)
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1587382727 secs (440939.65 hrs) behind the primary
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Suggested output:
MongoDB Enterprise replset:PRIMARY> rs.printSlaveReplicationInfo()
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source: localhost:27018
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syncedTo: Mon Apr 20 2020 12:38:47 GMT+0100 (WEST)
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0 secs (0 hrs) behind the primary
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source: localhost:27019
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*InitialSyncSyncSource: <host:port>*
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*InitialSyncRemainingEstimatedDuration: “remainingInitialSyncEstimatedMillis” in X hours Y minutes*
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Attachments
Issue Links
- 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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