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Type:
Task
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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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None
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Fully Compatible
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Server Serverless 2023-02-20
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55
Here is example currentOp output on the donor:
{
desc: 'tenant donor migration',
migrationCompleted: false,
instanceID: UUID("c71ed9d7-f8b8-4f99-a51e-f387c2c76d51"),
tenantId: 'mtm',
recipientConnectionString: 'mongodb://u:p@127.0.0.1:28000/?replicaSet=proxytest2&ssl=true',
readPreference: { mode: 'primaryPreferred' },
receivedCancellation: false,
lastDurableState: 4,
migrationStart: ISODate("2022-05-25T13:12:28.560Z"),
startMigrationDonorTimestamp: Timestamp({ t: 1653484348, i: 25 }),
blockTimestamp: Timestamp({ t: 1653485495, i: 1 }),
commitOrAbortOpTime: { ts: Timestamp({ t: 1653486224, i: 1 }), t: Long("1") }
}
and recipient:
{
desc: 'tenant recipient migration',
instanceID: UUID("c71ed9d7-f8b8-4f99-a51e-f387c2c76d51"),
tenantId: 'mtm',
donorConnectionString: 'proxytest/host1.local.10gen.cc:27000,host2.local.10gen.cc:27010,host3.local.10gen.cc:27020',
readPreference: { mode: 'primaryPreferred' },
state: 2,
dataSyncCompleted: false,
migrationCompleted: false,
numRestartsDueToDonorConnectionFailure: Long("0"),
numRestartsDueToRecipientFailure: Long("0"),
approxTotalDataSize: Long("36846854"),
approxTotalBytesCopied: Long("36851562"),
totalReceiveElapsedMillis: Long("1707019"),
remainingReceiveEstimatedMillis: Long("-218"),
databases: {
databasesClonedBeforeFailover: 0,
databasesToClone: 1,
databasesCloned: 1,
approxTotalDataSize: 36846854,
approxTotalBytesCopied: 36851562,
mtm_test: {
clonedCollectionsBeforeFailover: 0,
collections: 1,
clonedCollections: 1,
start: ISODate("2022-05-25T13:14:39.657Z"),
end: ISODate("2022-05-25T13:15:02.294Z"),
elapsedMillis: 22637,
'mtm_test.foo': {
documentsToCopy: 1674857,
documentsCopied: 1675071,
indexes: 1,
insertedBatches: 3,
start: ISODate("2022-05-25T13:14:39.659Z"),
end: ISODate("2022-05-25T13:15:02.294Z"),
elapsedMillis: 22635,
receivedBatches: 4
}
}
},
startFetchingDonorOpTime: { ts: Timestamp({ t: 1653484348, i: 32 }), t: Long("1") },
startApplyingDonorOpTime: { ts: Timestamp({ t: 1653484349, i: 2 }), t: Long("1") },
dataConsistentStopDonorOpTime: { ts: Timestamp({ t: 1653484488, i: 13 }), t: Long("1") },
cloneFinishedRecipientOpTime: { ts: Timestamp({ t: 1653484502, i: 22028 }), t: Long("1") },
donorSyncSource: 'host1.local.10gen.cc:27000',
receiveStart: ISODate("2022-05-25T13:12:28.780Z"),
numOpsApplied: 75000
}
We should at least update the "state" fields to contain a descriptive string rather than number values like "4" and "2". In particular, when the donor is waiting for donorForgetMigration, it'd be helpful for its state to say something like "Waiting for donorForgetMigration command".
It would also be nice name documentsToCopy and documentsCopied so that it's not surprising if documentsCopied is larger. Perhaps documentsToCopyAtStartOfClone and documentsCopiedIncludingOplogCatchup, if those are the right meanings?
We could also change the recipient's "dataSyncCompleted" field to "migrationCompleted". It's confusing that today dataSyncCompleted remains false even after the donor has made the commit decision, and only gets set to true when the recipient receives recipientForgetMigration.
- is duplicated by
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- Closed
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