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Type: Improvement
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 3.6.0-rc0
Affects Version/s: None
Component/s: Aggregation Framework
Labels:
None

Backwards Compatibility:
Fully Compatible
Sprint:
Query 2017-09-11, Query 2017-10-02, Query 2017-10-23
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Causal consistency inserts readConcern

{level:"local", afterClusterTime: "xxxxx"}

(https://github.com/mongodb/mongo/blob/r3.5.11/src/mongo/shell/mongo.js#L140-L166) into all commands hence to allow CC session support commands should not reject readConcern

{level:"local"}

as it is a default readConcern level already.
the reject for non supported readConcern

{level:"majority"}

should be left without changes.

[js_test:agg_hint] 2017-08-09T21:16:05.041+0000 cmd: {
[js_test:agg_hint] 2017-08-09T21:16:05.041+0000 	"query" : {
[js_test:agg_hint] 2017-08-09T21:16:05.045+0000 		"aggregate" : "test",
[js_test:agg_hint] 2017-08-09T21:16:05.046+0000 		"pipeline" : [
[js_test:agg_hint] 2017-08-09T21:16:05.046+0000 			{
[js_test:agg_hint] 2017-08-09T21:16:05.048+0000 				"$match" : {
[js_test:agg_hint] 2017-08-09T21:16:05.048+0000 					"x" : 3
[js_test:agg_hint] 2017-08-09T21:16:05.048+0000 				}
[js_test:agg_hint] 2017-08-09T21:16:05.049+0000 			}
[js_test:agg_hint] 2017-08-09T21:16:05.049+0000 		],
[js_test:agg_hint] 2017-08-09T21:16:05.049+0000 		"hint" : "x_1",
[js_test:agg_hint] 2017-08-09T21:16:05.049+0000 		"explain" : true,
[js_test:agg_hint] 2017-08-09T21:16:05.050+0000 		"cursor" : {
[js_test:agg_hint] 2017-08-09T21:16:05.050+0000 
[js_test:agg_hint] 2017-08-09T21:16:05.050+0000 		},
[js_test:agg_hint] 2017-08-09T21:16:05.050+0000 		"readConcern" : {
[js_test:agg_hint] 2017-08-09T21:16:05.051+0000 			"afterClusterTime" : Timestamp(1502313364, 13),
[js_test:agg_hint] 2017-08-09T21:16:05.055+0000 			"level" : "local"
[js_test:agg_hint] 2017-08-09T21:16:05.061+0000 		}
[js_test:agg_hint] 2017-08-09T21:16:05.068+0000 	},
[js_test:agg_hint] 2017-08-09T21:16:05.069+0000 	"$readPreference" : {
[js_test:agg_hint] 2017-08-09T21:16:05.071+0000 		"mode" : "secondary"
[js_test:agg_hint] 2017-08-09T21:16:05.071+0000 	},
[js_test:agg_hint] 2017-08-09T21:16:05.071+0000 	"$clusterTime" : {
[js_test:agg_hint] 2017-08-09T21:16:05.074+0000 		"clusterTime" : Timestamp(1502313364, 13),
[js_test:agg_hint] 2017-08-09T21:16:05.074+0000 		"signature" : {
[js_test:agg_hint] 2017-08-09T21:16:05.075+0000 			"hash" : BinData(0,"H09GsI66Qu9sYoIExRAmnN6Ivyg="),
[js_test:agg_hint] 2017-08-09T21:16:05.075+0000 			"keyId" : NumberLong("6452386646464659457")
[js_test:agg_hint] 2017-08-09T21:16:05.081+0000 		}
[js_test:agg_hint] 2017-08-09T21:16:05.086+0000 	}
[js_test:agg_hint] 2017-08-09T21:16:05.088+0000 }
[js_test:agg_hint] 2017-08-09T21:16:05.090+0000  res: {
[js_test:agg_hint] 2017-08-09T21:16:05.091+0000 	"ok" : 0,
[js_test:agg_hint] 2017-08-09T21:16:05.092+0000 	"errmsg" : "Aggregation explain does not support the 'readConcern' option",
[js_test:agg_hint] 2017-08-09T21:16:05.092+0000 	"code" : 9,
[js_test:agg_hint] 2017-08-09T21:16:05.093+0000 	"codeName" : "FailedToParse",
[js_test:agg_hint] 2017-08-09T21:16:05.093+0000 	"$clusterTime" : {
[js_test:agg_hint] 2017-08-09T21:16:05.100+0000 		"clusterTime" : Timestamp(1502313364, 13),
[js_test:agg_hint] 2017-08-09T21:16:05.100+0000 		"signature" : {
[js_test:agg_hint] 2017-08-09T21:16:05.100+0000 			"hash" : BinData(0,"H09GsI66Qu9sYoIExRAmnN6Ivyg="),
[js_test:agg_hint] 2017-08-09T21:16:05.103+0000 			"keyId" : NumberLong("6452386646464659457")
[js_test:agg_hint] 2017-08-09T21:16:05.104+0000 		}
[js_test:agg_hint] 2017-08-09T21:16:05.105+0000 	},
[js_test:agg_hint] 2017-08-09T21:16:05.105+0000 	"operationTime" : Timestamp(1502313364, 13)
[js_test:agg_hint] 2017-08-09T21:16:05.105+0000 }

also here:

s_test:views_count] 2017-08-09T19:03:41.791-0400 XXX runCommand: cmd: {
[js_test:views_count] 2017-08-09T19:03:41.791-0400 	"query" : {
[js_test:views_count] 2017-08-09T19:03:41.792-0400 		"explain" : {
[js_test:views_count] 2017-08-09T19:03:41.792-0400 			"count" : "lessThanSevenView",
[js_test:views_count] 2017-08-09T19:03:41.792-0400 			"query" : {
[js_test:views_count] 2017-08-09T19:03:41.792-0400 
[js_test:views_count] 2017-08-09T19:03:41.792-0400 			},
[js_test:views_count] 2017-08-09T19:03:41.792-0400 			"fields" : {
[js_test:views_count] 2017-08-09T19:03:41.792-0400 
[js_test:views_count] 2017-08-09T19:03:41.792-0400 			}
[js_test:views_count] 2017-08-09T19:03:41.792-0400 		},
[js_test:views_count] 2017-08-09T19:03:41.792-0400 		"verbosity" : "queryPlanner",
[js_test:views_count] 2017-08-09T19:03:41.792-0400 		"readConcern" : {
[js_test:views_count] 2017-08-09T19:03:41.793-0400 			"afterClusterTime" : Timestamp(1502319821, 18),
[js_test:views_count] 2017-08-09T19:03:41.793-0400 			"level" : "local"
[js_test:views_count] 2017-08-09T19:03:41.793-0400 		}
[js_test:views_count] 2017-08-09T19:03:41.793-0400 	},
[js_test:views_count] 2017-08-09T19:03:41.793-0400 	"$readPreference" : {
[js_test:views_count] 2017-08-09T19:03:41.793-0400 		"mode" : "secondary"
[js_test:views_count] 2017-08-09T19:03:41.793-0400 	},
[js_test:views_count] 2017-08-09T19:03:41.793-0400 	"$clusterTime" : {
[js_test:views_count] 2017-08-09T19:03:41.793-0400 		"clusterTime" : Timestamp(1502319821, 18),
[js_test:views_count] 2017-08-09T19:03:41.793-0400 		"signature" : {
[js_test:views_count] 2017-08-09T19:03:41.794-0400 			"hash" : BinData(0,"JSpLnjCFZeSqWikBtZqtmZ2aaEs="),
[js_test:views_count] 2017-08-09T19:03:41.794-0400 			"keyId" : NumberLong("6452414452082933761")
[js_test:views_count] 2017-08-09T19:03:41.794-0400 		}
[js_test:views_count] 2017-08-09T19:03:41.794-0400 	}
[js_test:views_count] 2017-08-09T19:03:41.794-0400 }
[js_test:views_count] 2017-08-09T19:03:41.795-0400 XXX runCommand: res: {
[js_test:views_count] 2017-08-09T19:03:41.795-0400 	"ok" : 0,
[js_test:views_count] 2017-08-09T19:03:41.795-0400 	"errmsg" : "Explain command on shard shard-rs0/greyparrot:20003,greyparrot:20004 failed, caused by: { ok: 0.0, errmsg: \"Aggregation explain does not support the 'readConcern' option\", code: 9, codeName: \"FailedToParse\" }",
[js_test:views_count] 2017-08-09T19:03:41.795-0400 	"code" : 9,
[js_test:views_count] 2017-08-09T19:03:41.795-0400 	"codeName" : "FailedToParse",
[js_test:views_count] 2017-08-09T19:03:41.795-0400 	"$clusterTime" : {
[js_test:views_count] 2017-08-09T19:03:41.795-0400 		"clusterTime" : Timestamp(1502319821, 18),
[js_test:views_count] 2017-08-09T19:03:41.795-0400 		"signature" : {
[js_test:views_count] 2017-08-09T19:03:41.796-0400 			"hash" : BinData(0,"JSpLnjCFZeSqWikBtZqtmZ2aaEs="),
[js_test:views_count] 2017-08-09T19:03:41.796-0400 			"keyId" : NumberLong("6452414452082933761")
[js_test:views_count] 2017-08-09T19:03:41.796-0400 		}
[js_test:views_count] 2017-08-09T19:03:41.796-0400 	},
[js_test:views_count] 2017-08-09T19:03:41.796-0400 	"operationTime" : Timestamp(1502319821, 18)
[js_test:views_count] 2017-08-09T19:03:41.796-0400 }

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