1description: db-aggregate-write-readPreference
2
3schemaVersion: '1.4'
4
5runOnRequirements:
6 # 3.6+ non-standalone is needed to utilize $readPreference in OP_MSG.
7 # Serverless does not support $listLocalSessions and $currentOp stages, and
8 # mongos does not allow combining them with $out or $merge.
9 - minServerVersion: "3.6"
10 topologies: [ replicaset ]
11 serverless: forbid
12
13_yamlAnchors:
14 readConcern: &readConcern
15 level: &readConcernLevel "local"
16 writeConcern: &writeConcern
17 w: &writeConcernW 1
18
19createEntities:
20 - client:
21 id: &client0 client0
22 observeEvents:
23 - commandStartedEvent
24 # Used to test that read and write concerns are still inherited
25 uriOptions:
26 readConcernLevel: *readConcernLevel
27 w: *writeConcernW
28 - database:
29 id: &database0 database0
30 client: *client0
31 databaseName: &database0Name db0
32 databaseOptions:
33 readPreference: &readPreference
34 # secondaryPreferred is specified for compatibility with clusters that
35 # may not have a secondary (e.g. each shard is only a primary).
36 mode: secondaryPreferred
37 # maxStalenessSeconds is specified to ensure that drivers forward the
38 # read preference to mongos or a load balancer. That would not be the
39 # case with only secondaryPreferred.
40 maxStalenessSeconds: 600
41 - collection:
42 id: &collection0 collection0
43 database: *database0
44 collectionName: &collection0Name coll0
45
46initialData:
47 - collectionName: *collection0Name
48 databaseName: *database0Name
49 documents: []
50
51tests:
52 - description: "Database-level aggregate with $out includes read preference for 5.0+ server"
53 runOnRequirements:
54 - minServerVersion: "5.0"
55 serverless: "forbid"
56 operations:
57 - object: *database0
58 name: aggregate
59 arguments:
60 pipeline: &outPipeline
61 - { $listLocalSessions: {} }
62 - { $limit: 1 }
63 - { $addFields: { _id: 1 } }
64 - { $project: { _id: 1 } }
65 - { $out: *collection0Name }
66 expectEvents:
67 - client: *client0
68 events:
69 - commandStartedEvent:
70 command:
71 aggregate: 1
72 pipeline: *outPipeline
73 $readPreference: *readPreference
74 readConcern: *readConcern
75 writeConcern: *writeConcern
76 outcome: &outcome
77 - collectionName: *collection0Name
78 databaseName: *database0Name
79 documents:
80 - { _id: 1 }
81
82 - description: "Database-level aggregate with $out omits read preference for pre-5.0 server"
83 runOnRequirements:
84 # MongoDB 4.2 introduced support for read concerns and write stages.
85 # Pre-4.2 servers may allow a "local" read concern anyway, but some
86 # drivers may avoid inheriting a client-level read concern for pre-4.2.
87 - minServerVersion: "4.2"
88 maxServerVersion: "4.4.99"
89 serverless: "forbid"
90 operations:
91 - object: *database0
92 name: aggregate
93 arguments:
94 pipeline: *outPipeline
95 expectEvents:
96 - client: *client0
97 events:
98 - commandStartedEvent:
99 command:
100 aggregate: 1
101 pipeline: *outPipeline
102 $readPreference: { $$exists: false }
103 readConcern: *readConcern
104 writeConcern: *writeConcern
105 outcome: *outcome
106
107 - description: "Database-level aggregate with $merge includes read preference for 5.0+ server"
108 runOnRequirements:
109 - minServerVersion: "5.0"
110 operations:
111 - object: *database0
112 name: aggregate
113 arguments:
114 pipeline: &mergePipeline
115 - { $listLocalSessions: {} }
116 - { $limit: 1 }
117 - { $addFields: { _id: 1 } }
118 - { $project: { _id: 1 } }
119 - { $merge: { into: *collection0Name } }
120 expectEvents:
121 - client: *client0
122 events:
123 - commandStartedEvent:
124 command:
125 aggregate: 1
126 pipeline: *mergePipeline
127 $readPreference: *readPreference
128 readConcern: *readConcern
129 writeConcern: *writeConcern
130 outcome: *outcome
131
132 - description: "Database-level aggregate with $merge omits read preference for pre-5.0 server"
133 runOnRequirements:
134 - minServerVersion: "4.2"
135 maxServerVersion: "4.4.99"
136 operations:
137 - object: *database0
138 name: aggregate
139 arguments:
140 pipeline: *mergePipeline
141 expectEvents:
142 - client: *client0
143 events:
144 - commandStartedEvent:
145 command:
146 aggregate: 1
147 pipeline: *mergePipeline
148 $readPreference: { $$exists: false }
149 readConcern: *readConcern
150 writeConcern: *writeConcern
151 outcome: *outcome
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