[SERVER-7788] Error reported in log Created: 28/Nov/12  Updated: 08/Mar/13  Resolved: 24/Feb/13

Status: Closed
Project: Core Server
Component/s: Storage, Usability
Affects Version/s: 2.2.2
Fix Version/s: None

Type: Bug Priority: Minor - P4
Reporter: Samuel Rettore Assignee: David Hows
Resolution: Incomplete Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified
Environment:

Debian linux 64 bits.


Operating System: ALL
Participants:

 Description   

Wed Nov 28 10:00:02 [conn44] end connection xxxx:40800 (19 connections now open)
Wed Nov 28 10:00:05 [snapshotthread] cpu: elapsed:4000  writelock: 0%
Wed Nov 28 10:00:07 [conn4] query xx.BrqQuantaPosicao query: { _id: ObjectId('50a2c5fee4b03aa4348b6f03') } ntoreturn:1 idhack:1 keyUpdates:0 locks(micros) r:154484 reslen:1066 154ms
Wed Nov 28 10:00:09 [snapshotthread] cpu: elapsed:4000  writelock: 0%
Wed Nov 28 10:00:09 [snapshotthread]   Assertion failure _newer._created > _older._created src/mongo/db/stats/snapshots.cpp 40
0xaffd31 0xac65cd 0x9beb4a 0x9bf0b1 0xac8dfe 0xaca444 0xb45ba9 0x7f9a8a0788ca 0x7f9a8942bb6d 
 /usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xaffd31]
 /usr/bin/mongod(_ZN5mongo12verifyFailedEPKcS1_j+0xfd) [0xac65cd]
 /usr/bin/mongod() [0x9beb4a]
 /usr/bin/mongod(_ZN5mongo14SnapshotThread3runEv+0x91) [0x9bf0b1]
 /usr/bin/mongod(_ZN5mongo13BackgroundJob7jobBodyEN5boost10shared_ptrINS0_9JobStatusEEE+0xbe) [0xac8dfe]
 /usr/bin/mongod(_ZN5boost6detail11thread_dataINS_3_bi6bind_tIvNS_4_mfi3mf1IvN5mongo13BackgroundJobENS_10shared_ptrINS7_9JobStatusEEEEENS2_5list2INS2_5valueIPS7_EENSD_ISA_EEEEEEE3runEv+0x74) [0xaca444]
 /usr/bin/mongod() [0xb45ba9]
 /lib/libpthread.so.0(+0x68ca) [0x7f9a8a0788ca]
 /lib/libc.so.6(clone+0x6d) [0x7f9a8942bb6d]
Wed Nov 28 10:00:09 [snapshotthread] ERROR in SnapshotThread: assertion src/mongo/db/stats/snapshots.cpp:40
Wed Nov 28 10:00:13 [snapshotthread] cpu: elapsed:3899  writelock: 0%



 Comments   
Comment by David Hows [ 30/Nov/12 ]

Hi Samuel,

The alert you have seen here is that the performance metric snapshot delta's creation time was not greater than the last one.

There are a few reasons that this could occur, but realistically if the issue occurred only once and you cannot see any impacts you should be okay.

Cheers,

David

Comment by Samuel Rettore [ 29/Nov/12 ]

Hello David,

The problem I could see only once, checked the data and everything is OK.

It's the first time I see error like this at first but everything behaves well.

There were no other impacts, just reported it to alert a possible failure but does not fit smoothly the goal is to help yourself.

cordially

Samuel

Comment by David Hows [ 29/Nov/12 ]

Hi Samuel,

Does the issue occur consistently? Or just the once?

If consistently, is there anything you can do to cause it? Or it just happens?

Additionally, are there any other impacts - beyond the error in your log?

Cheers,

David

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