-
Type:
Bug
-
Resolution: Done
-
Priority:
Major - P3
-
None
-
Affects Version/s: 2.2.3
-
Component/s: None
-
None
-
Environment:ubuntu
-
ALL
-
None
-
3
-
None
-
None
-
None
-
None
-
None
-
None
I'm in the process of upgrading from 2.2.3 to 2.4.5. I upgraded one cluster last week and another this week, and both times, when I elected the new primary, it turned out to be missing all the indexes for at least a couple of collections.
Here's a collection on the old primary:
mongodata3:SECONDARY> db["app_22d9b327-2c33-4296-bb50-48b6917b356f:_Installation"].stats()
{
"ns" : "appdata53.app_22d9b327-2c33-4296-bb50-48b6917b356f:_Installation",
"count" : 2962834,
"size" : 1011357036,
"avgObjSize" : 341.3478568154679,
"storageSize" : 1164914688,
"numExtents" : 18,
"nindexes" : 8,
"lastExtentSize" : 307515392,
"paddingFactor" : 1.0000000002533629,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 1238917456,
"indexSizes" : {
"_id_" : 123800992,
"installationId_1_deviceToken_1" : 236245520,
"installationId_1" : 231871360,
"deviceToken_1" : 67214896,
"_updated_at_1" : 142589440,
"_created_at_1" : 96967360,
"timeZone_1__created_at_1" : 236220992,
"channels_1__created_at_1" : 104006896
},
"ok" : 1
}
and on the new one:
mongodata3:PRIMARY> db["app_22d9b327-2c33-4296-bb50-48b6917b356f:_Installation"].stats()
{
"ns" : "appdata53.app_22d9b327-2c33-4296-bb50-48b6917b356f:_Installation",
"count" : 2962834,
"size" : 861644152,
"avgObjSize" : 290.81755913426133,
"storageSize" : 965894144,
"numExtents" : 18,
"nindexes" : 1,
"lastExtentSize" : 256282624,
"paddingFactor" : 1.0000000002360774,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 152073600,
"indexSizes" : {
"_id_" : 152073600
},
"ok" : 1
}
Not sure how many collections this has happened to, I only found these by visually scanning the logs for high nscanned numbers. I have tried grepping the logs for any indication of an index getting dropped, but there is nada.
I did run a compaction on all the collections a while back, but I checked for interrupted index builds at the time and didn't see anything. That's the only thing I can think of though, am I missing anything?