We have several shardings, each sharding has 3 nodes(1 primary, 1 slave, 1 arbiter). On one of those shardings, slave crashes for many times due to the same reason:

========================================================================================================================
Log from slave node:

Mon Jan 14 20:17:16 [rsBackgroundSync] replSet syncing to: test-mongodb-online01.company.internal:27018
Mon Jan 14 20:17:17 [conn361741] end connection 10.10.111.111:7099 (131 connections now open)
Mon Jan 14 20:17:17 [rsSync] replSet error possible failover clock skew issue? 50f3f741:305
Mon Jan 14 20:17:17 [conn361832] end connection 10.10.112.112:13124 (130 connections now open)
Mon Jan 14 20:17:17 [repl writer worker 1] ERROR: writer worker caught exception: E11000 duplicate key error index: test.test.$user_id_1_doc_id_1 dup key: { : "40b2d10559dd731750839a20b78ac075", : 331282 } on: { ts: Timestamp 1358165814000|175, h: -7276577398417103929, v: 2, op: "i", ns: "test.test", o:

{ _id: "2013-01-14_40b2d10559dd731750839a20b78ac075_331282", user_id: "40b2d10559dd731750839a20b78ac075", doc_id: 331282, col1: 277939, col2: 31, col3: -1, col4: 1358165766, col5: 2 }

}
Mon Jan 14 20:17:17 [repl writer worker 1] Fatal Assertion 16360
0xaffd31 0xac5323 0x9a2e56 0xad35cd 0xb45ba9 0x3d56407851 0x3d560e767d
/usr/bin/mongod(_ZN5mongo15printStackTraceERSo+0x21) [0xaffd31]
/usr/bin/mongod(_ZN5mongo13fassertFailedEi+0xa3) [0xac5323]
/usr/bin/mongod(_ZN5mongo7replset14multiSyncApplyERKSt6vectorINS_7BSONObjESaIS2_EEPNS0_8SyncTailE+0x156) [0x9a2e56]
/usr/bin/mongod(_ZN5mongo10threadpool6Worker4loopEv+0x26d) [0xad35cd]
/usr/bin/mongod() [0xb45ba9]
/lib64/libpthread.so.0() [0x3d56407851]
/lib64/libc.so.6(clone+0x6d) [0x3d560e767d]
Mon Jan 14 20:17:17 [repl writer worker 1]

***aborting after fassert() failure

========================================================================================================================

The following shows the indexes of our collection, user_id is our shard key:

test1:PRIMARY> use test
switched to db test
test1:PRIMARY> db.test.getIndexes()
[
{
"v" : 1,
"key" :

{ "_id" : 1 }

,
"ns" : "test.test",
"name" : "id"
},
{
"v" : 1,
"key" :

{ "user_id" : 1 }

,
"ns" : "test.test",
"name" : "user_id_1"
},
{
"v" : 1,
"key" :

{ "user_id" : 1, "doc_id" : 1 }

,
"unique" : true,
"ns" : "test.test",
"name" : "user_id_1_doc_id_1"
}
]

We have examined the oplog regarding the specific key, and we don't find any clues that we break the idempotency. Could anyone give me some advices? Thanks.

test1:PRIMARY> use local
switched to db local
test1:PRIMARY> db.oplog.rs.find(

{ "op" : "i", "o.user_id" : "40b2d10559dd731750839a20b78ac075" }

)
{ "ts" : Timestamp(1358165814000, 175), "h" : NumberLong("-7276577398417103929"), "v" : 2, "op" : "i", "ns" : "test.test", "o" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282", "user_id" : "40b2d10559dd731750839a20b78ac075", "doc_id" : 331282, "col1" : 277939, "col2" : 31, "col3" : -1, "col4" : 1358165766, "col5" : 2 }

}

test1:PRIMARY> db.oplog.rs.find(

{ "op" : "u", "o2._id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

)
{ "ts" : Timestamp(1358165862000, 502), "h" : NumberLong("-2969379546764696617"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165857 }

, "$set" :

{ "col4" : 1358165857 }

, "$set" :

{ "col4" : 1358165857 }

, "$set" :

{ "col4" : 1358165857 }

, "$set" :

{ "col4" : 1358165857 }

} }
{ "ts" : Timestamp(1358165862000, 847), "h" : NumberLong("-9174841252872684216"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

} }
{ "ts" : Timestamp(1358165865000, 819), "h" : NumberLong("8728551110388921671"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

} }
{ "ts" : Timestamp(1358165866000, 149), "h" : NumberLong("-5398085733751542631"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

, "$set" :

{ "col4" : 1358165860 }

} }
{ "ts" : Timestamp(1358165868000, 974), "h" : NumberLong("-472422500396759906"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165862 }

, "$set" :

{ "col4" : 1358165862 }

, "$set" :

{ "col4" : 1358165862 }

, "$set" :

{ "col4" : 1358165862 }

, "$set" :

{ "col4" : 1358165862 }

} }
{ "ts" : Timestamp(1358165869000, 1635), "h" : NumberLong("-2936801391795544718"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165847 }

, "$set" :

{ "col4" : 1358165847 }

, "$set" :

{ "col4" : 1358165847 }

, "$set" :

{ "col4" : 1358165847 }

, "$set" :

{ "col4" : 1358165847 }

} }
{ "ts" : Timestamp(1358165871000, 328), "h" : NumberLong("4783438901816552532"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165868 }

, "$set" :

{ "col4" : 1358165868 }

, "$set" :

{ "col4" : 1358165868 }

, "$set" :

{ "col4" : 1358165868 }

, "$set" :

{ "col4" : 1358165868 }

} }
{ "ts" : Timestamp(1358165871000, 923), "h" : NumberLong("-7701283919644547362"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165831 }

, "$set" :

{ "col4" : 1358165831 }

, "$set" :

{ "col4" : 1358165831 }

, "$set" :

{ "col4" : 1358165831 }

, "$set" :

{ "col4" : 1358165831 }

} }
{ "ts" : Timestamp(1358165877000, 217), "h" : NumberLong("905044855275590032"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165858 }

, "$set" :

{ "col4" : 1358165858 }

, "$set" :

{ "col4" : 1358165858 }

, "$set" :

{ "col4" : 1358165858 }

, "$set" :

{ "col4" : 1358165858 }

} }
{ "ts" : Timestamp(1358165878000, 321), "h" : NumberLong("1021697642751326149"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165814 }

, "$set" :

{ "col4" : 1358165814 }

, "$set" :

{ "col4" : 1358165814 }

, "$set" :

{ "col4" : 1358165814 }

, "$set" :

{ "col4" : 1358165814 }

} }
{ "ts" : Timestamp(1358165878000, 1479), "h" : NumberLong("-1093460978146924040"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165861 }

, "$set" :

{ "col4" : 1358165861 }

, "$set" :

{ "col4" : 1358165861 }

, "$set" :

{ "col4" : 1358165861 }

, "$set" :

{ "col4" : 1358165861 }

} }
{ "ts" : Timestamp(1358165881000, 253), "h" : NumberLong("7582300884665231609"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

} }
{ "ts" : Timestamp(1358165886000, 194), "h" : NumberLong("-6977646000941125783"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165841 }

, "$set" :

{ "col4" : 1358165841 }

, "$set" :

{ "col4" : 1358165841 }

, "$set" :

{ "col4" : 1358165841 }

, "$set" :

{ "col4" : 1358165841 }

} }
{ "ts" : Timestamp(1358165891000, 8), "h" : NumberLong("4878117036357406261"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

} }
{ "ts" : Timestamp(1358165925000, 1403), "h" : NumberLong("-4218451351552474554"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165892 }

, "$set" :

{ "col4" : 1358165892 }

, "$set" :

{ "col4" : 1358165892 }

, "$set" :

{ "col4" : 1358165892 }

, "$set" :

{ "col4" : 1358165892 }

} }
{ "ts" : Timestamp(1358165926000, 37), "h" : NumberLong("8166869776502988491"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

} }
{ "ts" : Timestamp(1358165926000, 1020), "h" : NumberLong("-2018291843739556146"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165913 }

, "$set" :

{ "col4" : 1358165913 }

, "$set" :

{ "col4" : 1358165913 }

, "$set" :

{ "col4" : 1358165913 }

, "$set" :

{ "col4" : 1358165913 }

} }
{ "ts" : Timestamp(1358165926000, 1578), "h" : NumberLong("-728060886959932591"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165888 }

, "$set" :

{ "col4" : 1358165888 }

, "$set" :

{ "col4" : 1358165888 }

, "$set" :

{ "col4" : 1358165888 }

, "$set" :

{ "col4" : 1358165888 }

} }
{ "ts" : Timestamp(1358165932000, 363), "h" : NumberLong("-2899178056259116954"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165873 }

, "$set" :

{ "col4" : 1358165873 }

, "$set" :

{ "col4" : 1358165873 }

, "$set" :

{ "col4" : 1358165873 }

, "$set" :

{ "col4" : 1358165873 }

} }
{ "ts" : Timestamp(1358165933000, 361), "h" : NumberLong("3881140476962009969"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

, "$set" :

{ "col4" : 1358165883 }

} }
{ "ts" : Timestamp(1358165939000, 359), "h" : NumberLong("-7011314542025612956"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165899 }

, "$set" :

{ "col4" : 1358165899 }

, "$set" :

{ "col4" : 1358165899 }

, "$set" :

{ "col4" : 1358165899 }

, "$set" :

{ "col4" : 1358165899 }

} }
{ "ts" : Timestamp(1358165942000, 1288), "h" : NumberLong("8584958629205924536"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

, "$set" :

{ "col4" : 1358165882 }

} }
{ "ts" : Timestamp(1358165983000, 778), "h" : NumberLong("-1825276314084065452"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165918 }

, "$set" :

{ "col4" : 1358165918 }

, "$set" :

{ "col4" : 1358165918 }

, "$set" :

{ "col4" : 1358165918 }

, "$set" :

{ "col4" : 1358165918 }

} }
{ "ts" : Timestamp(1358165991000, 747), "h" : NumberLong("-6136876944333387998"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165935 }

, "$set" :

{ "col4" : 1358165935 }

, "$set" :

{ "col4" : 1358165935 }

, "$set" :

{ "col4" : 1358165935 }

, "$set" :

{ "col4" : 1358165935 }

} }
{ "ts" : Timestamp(1358165992000, 568), "h" : NumberLong("-628829561541387552"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

} }
{ "ts" : Timestamp(1358165992000, 1586), "h" : NumberLong("2249883926090089681"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165880 }

, "$set" :

{ "col4" : 1358165880 }

, "$set" :

{ "col4" : 1358165880 }

, "$set" :

{ "col4" : 1358165880 }

, "$set" :

{ "col4" : 1358165880 }

} }
{ "ts" : Timestamp(1358165993000, 913), "h" : NumberLong("-2406566488359488622"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165986 }

, "$set" :

{ "col4" : 1358165986 }

, "$set" :

{ "col4" : 1358165986 }

, "$set" :

{ "col4" : 1358165986 }

, "$set" :

{ "col4" : 1358165986 }

} }
{ "ts" : Timestamp(1358166031000, 414), "h" : NumberLong("2038488693111769456"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165985 }

, "$set" :

{ "col4" : 1358165985 }

, "$set" :

{ "col4" : 1358165985 }

, "$set" :

{ "col4" : 1358165985 }

, "$set" :

{ "col4" : 1358165985 }

} }
{ "ts" : Timestamp(1358166036000, 694), "h" : NumberLong("9076849425697437764"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

, "$set" :

{ "col4" : 1358165981 }

} }
{ "ts" : Timestamp(1358166050000, 1186), "h" : NumberLong("3767029040654546262"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165996 }

, "$set" :

{ "col4" : 1358165996 }

, "$set" :

{ "col4" : 1358165996 }

, "$set" :

{ "col4" : 1358165996 }

, "$set" :

{ "col4" : 1358165996 }

} }
{ "ts" : Timestamp(1358166057000, 465), "h" : NumberLong("4054304491520021028"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358166056 }

, "$set" :

{ "col4" : 1358166056 }

, "$set" :

{ "col4" : 1358166056 }

, "$set" :

{ "col4" : 1358166056 }

, "$set" :

{ "col4" : 1358166056 }

} }
{ "ts" : Timestamp(1358166057000, 867), "h" : NumberLong("-8241200638844377915"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358166049 }

, "$set" :

{ "col4" : 1358166049 }

, "$set" :

{ "col4" : 1358166049 }

, "$set" :

{ "col4" : 1358166049 }

, "$set" :

{ "col4" : 1358166049 }

} }
{ "ts" : Timestamp(1358166093000, 283), "h" : NumberLong("8163250488038851407"), "v" : 2, "op" : "u", "ns" : "test.test", "o2" :

{ "_id" : "2013-01-14_40b2d10559dd731750839a20b78ac075_331282" }

, "o" : { "$set" :

{ "col4" : 1358165996 }

, "$set" :

{ "col4" : 1358165996 }

, "$set" :

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