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/**
* Tests that query options are not dropped by mongos when a query against a view is rewritten as an
* aggregation against the underlying collection.
*/
(function() {
"use strict";
load("jstests/libs/profiler.js"); // For profilerHasSingleMatchingEntryOrThrow.
const st = new ShardingTest({
name: "view_rewrite",
shards: 2,
other: {
rs0: {
nodes:
[{rsConfig: {priority: 1}}, {rsConfig: {priority: 0, tags: {"tag": "secondary"}}}]
},
rs1: {
nodes:
[{rsConfig: {priority: 1}}, {rsConfig: {priority: 0, tags: {"tag": "secondary"}}}]
},
enableBalancer: false
}
});
const mongos = st.s0;
const config = mongos.getDB("config");
const mongosDB = mongos.getDB("view_rewrite");
const coll = mongosDB.getCollection("coll");
assert.commandWorked(config.adminCommand({enableSharding: mongosDB.getName()}));
st.ensurePrimaryShard(mongosDB.getName(), "view_rewrite-rs0");
const rs0Secondary = st.rs0.getSecondary();
const rs1Primary = st.rs1.getPrimary();
const rs1Secondary = st.rs1.getSecondary();
assert.commandWorked(config.adminCommand({shardCollection: coll.getFullName(), key: {a: 1}}));
assert.commandWorked(mongos.adminCommand({split: coll.getFullName(), middle: {a: 5}}));
assert.commandWorked(
mongosDB.adminCommand({moveChunk: coll.getFullName(), find: {a: 5}, to: "view_rewrite-rs1"}));
for (let i = 0; i < 10; ++i) {
assert.writeOK(coll.insert({a: i}));
}
assert.commandWorked(mongosDB.createView("view", coll.getName(), []));
const view = mongosDB.getCollection("view");
//
// Confirms that queries run against views on mongos result in execution of a rewritten
// aggregation that contains all expected query options.
//
function confirmOptionsInProfiler(shardPrimary) {
assert.commandWorked(shardPrimary.setProfilingLevel(2));
// Aggregation
assert.commandWorked(mongosDB.runCommand({
aggregate: "view",
pipeline: [],
comment: "agg_rewrite",
maxTimeMS: 5 * 60 * 1000,
readConcern: {level: "linearizable"},
cursor: {}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardPrimary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "agg_rewrite",
"command.maxTimeMS": {"$exists": true},
"command.readConcern": {level: "linearizable"},
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Find
assert.commandWorked(mongosDB.runCommand({
find: "view",
comment: "find_rewrite",
maxTimeMS: 5 * 60 * 1000,
readConcern: {level: "linearizable"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardPrimary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "find_rewrite",
"command.maxTimeMS": {"$exists": true},
"command.readConcern": {level: "linearizable"},
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Count
assert.commandWorked(mongosDB.runCommand({
count: "view",
comment: "count_rewrite",
maxTimeMS: 5 * 60 * 1000,
readConcern: {level: "linearizable"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardPrimary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "count_rewrite",
"command.maxTimeMS": {"$exists": true},
"command.readConcern": {level: "linearizable"},
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Distinct
assert.commandWorked(mongosDB.runCommand({
distinct: "view",
key: "a",
comment: "distinct_rewrite",
maxTimeMS: 5 * 60 * 1000,
readConcern: {level: "linearizable"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardPrimary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "distinct_rewrite",
"command.maxTimeMS": {"$exists": true},
"command.readConcern": {level: "linearizable"},
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
assert.commandWorked(shardPrimary.setProfilingLevel(0));
shardPrimary.system.profile.drop();
}
//
// Confirms that queries run against views on mongos are executed against a tagged secondary, as
// per readPreference setting.
//
function confirmReadPreference(shardSecondary) {
assert.commandWorked(shardSecondary.setProfilingLevel(2));
// Aggregation
assert.commandWorked(mongosDB.runCommand({
query: {aggregate: "view", pipeline: [], comment: "agg_readPref", cursor: {}},
$readPreference: {mode: "nearest", tags: [{tag: "secondary"}]},
readConcern: {level: "local"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardSecondary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "agg_readPref",
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Find
assert.commandWorked(mongosDB.runCommand({
query: {find: "view", comment: "find_readPref", maxTimeMS: 5 * 60 * 1000},
$readPreference: {mode: "nearest", tags: [{tag: "secondary"}]},
readConcern: {level: "local"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardSecondary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "find_readPref",
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Count
assert.commandWorked(mongosDB.runCommand({
query: {count: "view", comment: "count_readPref"},
$readPreference: {mode: "nearest", tags: [{tag: "secondary"}]},
readConcern: {level: "local"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardSecondary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "count_readPref",
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
// Distinct
assert.commandWorked(mongosDB.runCommand({
query: {distinct: "view", key: "a", comment: "distinct_readPref"},
$readPreference: {mode: "nearest", tags: [{tag: "secondary"}]},
readConcern: {level: "local"}
}));
profilerHasSingleMatchingEntryOrThrow({
profileDB: shardSecondary,
filter: {
"ns": coll.getFullName(),
"command.aggregate": coll.getName(),
"command.comment": "distinct_readPref",
"command.pipeline.$mergeCursors": {"$exists": false},
"nreturned": {"$exists": true}
}
});
assert.commandWorked(shardSecondary.setProfilingLevel(0));
}
confirmOptionsInProfiler(st.rs1.getPrimary().getDB(mongosDB.getName()));
confirmReadPreference(st.rs0.getSecondary().getDB(mongosDB.getName()));
confirmReadPreference(st.rs1.getSecondary().getDB(mongosDB.getName()));
st.stop();
})();
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