mmsdev:PRIMARY> db.app.migrations.findOne({_id: 'DownloadBaseWindowsMigration'});
2014-11-26T19:12:29.880+0000 I QUERY    Error: error: { "$err" : "Didn't find DiskLoc in WiredTigerRecordStore", "code" : 28556 }
    at Error (<anonymous>)
    at DBQuery.next (src/mongo/shell/query.js:259:15)
    at DBCollection.findOne (src/mongo/shell/collection.js:187:22)
    at (shell):1:19 at src/mongo/shell/query.js:259

2014-11-26T19:12:29.874+0000 I -        [conn1829] Assertion: 28556:Didn't find DiskLoc in WiredTigerRecordStore
2014-11-26T19:12:29.879+0000 I CONTROL  [conn1829] 
 0xf41389 0xee8d61 0xece71f 0xd5833e 0x8f1506 0x9ecba3 0xbcbaba 0xbb90bc 0xa9db93 0x7e0290 0xefd9c1 0x7f79b3a79182 0x7f79b2b79fbd
----- BEGIN BACKTRACE -----
{"backtrace":[{"b":"400000","o":"B41389"},{"b":"400000","o":"AE8D61"},{"b":"400000","o":"ACE71F"},{"b":"400000","o":"95833E"},{"b":"400000","o":"4F1506"},{"b":"400000","o":"5ECBA3"},{"b":"400000","o":"7CBABA"},{"b":"400000","o":"7B90BC"},{"b":"400000","o":"69DB93"},{"b":"400000","o":"3E0290"},{"b":"400000","o":"AFD9C1"},{"b":"7F79B3A71000","o":"8182"},{"b":"7F79B2A7F000","o":"FAFBD"}],"processInfo":{ "mongodbVersion" : "2.8.0-rc1", "gitVersion" : "c8171e7f969519af8b87a43425ae291ee69a0191", "uname" : { "sysname" : "Linux", "release" : "3.13.0-36-generic", "version" : "#63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000" }, { "b" : "7FFF89EAE000", "elfType" : 3 }, { "b" : "7F79B3A71000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3 }, { "b" : "7F79B3869000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3 }, { "b" : "7F79B3665000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3 }, { "b" : "7F79B3361000", "path" : "/usr/lib/x86_64-linux-gnu/libstdc++.so.6", "elfType" : 3 }, { "b" : "7F79B305B000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3 }, { "b" : "7F79B2E45000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3 }, { "b" : "7F79B2A7F000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3 }, { "b" : "7F79B3C8F000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3 } ] }}
 mongod(_ZN5mongo15printStackTraceERSo+0x29) [0xf41389]
 mongod(_ZN5mongo10logContextEPKc+0xE1) [0xee8d61]
 mongod(_ZN5mongo11msgassertedEiPKc+0xAF) [0xece71f]
 mongod(+0x95833E) [0xd5833e]
 mongod(_ZNK5mongo10Collection6docForEPNS_16OperationContextERKNS_7DiskLocE+0x16) [0x8f1506]
 mongod(_ZN5mongo11IDHackStage4workEPm+0x1A3) [0x9ecba3]
 mongod(_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_7DiskLocE+0x9A) [0xbcbaba]
 mongod(_ZN5mongo11newRunQueryEPNS_16OperationContextERNS_7MessageERNS_12QueryMessageERNS_5CurOpES3_b+0x99C) [0xbb90bc]
 mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortEb+0xBB3) [0xa9db93]
 mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0xE0) [0x7e0290]
 mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x421) [0xefd9c1]
 libpthread.so.0(+0x8182) [0x7f79b3a79182]
 libc.so.6(clone+0x6D) [0x7f79b2b79fbd]
-----  END BACKTRACE  -----
2014-11-26T19:12:29.879+0000 I COMMAND  [conn1829] assertion 28556 Didn't find DiskLoc in WiredTigerRecordStore ns:cloudconf.app.migrations query:{ _id: "DownloadBaseWindowsMigration" }
2014-11-26T19:12:29.879+0000 I COMMAND  [conn1829]  ntoskip:0 ntoreturn:-1
2014-11-26T19:13:38.306+0000 I QUERY    [conn521] command admin.$cmd command: listDatabases { listDatabases: 1 } keyUpdates:0  reslen:4505 4430ms

mmsdev:SECONDARY> db.app.migrations.findOne({_id: 'DownloadBaseWindowsMigration'});
null

ubuntu@ip-10-167-150-115:/log$ grep DownloadBaseWindowsMigration mms-server.log*
mms-server.log:     [java] 2014-11-25T19:30:31.674+0000 [main] gid: INFO  com.xgen.svc.common.migration.MigrationSvc [runOne:72] - Running migration DownloadBaseWindowsMigration
mms-server.log:     [java] 2014-11-25T19:30:31.712+0000 [main] gid: INFO  com.xgen.svc.common.migration.impl.DownloadBaseWindowsMigration [runInternal:28] - Finished migrating 26 documents
mms-server.log:     [java] 2014-11-25T19:30:31.713+0000 [main] gid: INFO  com.xgen.svc.common.migration.MigrationSvc [runOne:74] - Completed migration DownloadBaseWindowsMigration in 37msec

 [java] 2014-11-25T19:32:07.661+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 14886 (ms)
     [java] 2014-11-25T21:32:17.503+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 29046 (ms)
     [java] 2014-11-25T22:31:59.308+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 10328 (ms)
     [java] 2014-11-25T22:47:17.483+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 29441 (ms)
     [java] 2014-11-26T00:02:20.766+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 31003 (ms)
     [java] 2014-11-26T14:32:41.533+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 49895 (ms)
     [java] 2014-11-26T14:47:01.686+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 13590 (ms)
     [java] 2014-11-26T15:01:59.900+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 10134 (ms)
     [java] 2014-11-26T15:16:58.646+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 10882 (ms)
     [java] 2014-11-26T15:46:56.920+0000 [main] gid: INFO  com.xgen.svc.core.ServerMain [start:329] - Started mms in: 9591 (ms)
     [java] 2014-11-26T17:15:26.277+0000 [main] gid: ERROR com.xgen.svc.common.migration.MigrationRunner [run:183] - An unexpected error occurred: Didn't find DiskLoc in WiredTigerRecordStore

{
	"_id" : "DownloadBaseWindowsMigration",
	"status" : "COMPLETE",
	"numInserted" : 0,
	"numDeleted" : 0,
	"numUpdated" : 26,
	"startDate" : ISODate("2014-11-25T19:30:31.676Z"),
	"completedDate" : ISODate("2014-11-25T19:30:31.713Z")
}