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/**
* Validate basic batched multi-deletion functionality.
*
* @tags: [
* requires_fcv_61,
* requires_replication,
* ]
*/
(function() {
"use strict";
load("jstests/libs/analyze_plan.js");
function validateBatchedDeletes(conn) {
const db = conn.getDB("test");
const coll = db.getCollection("c");
const collName = coll.getName();
const docsPerBatchDefault = 100; // batchedDeletesTargetBatchDocs.
const collCount = 5017; // Intentionally not a multiple of batchedDeletesTargetBatchDocs.
function validateDeletion(db, coll, docsPerBatch) {
coll.drop();
assert.commandWorked(
coll.insertMany([...Array(collCount).keys()].map(x => ({_id: x, a: "a".repeat(1024)})),
{ordered: false}));
const serverStatusBatchesBefore = db.serverStatus()['batchedDeletes']['batches'];
const serverStatusDocsBefore = db.serverStatus()['batchedDeletes']['docs'];
assert.eq(collCount, coll.find().itcount());
assert.commandWorked(coll.deleteMany({_id: {$gte: 0}}));
assert.eq(0, coll.find().itcount());
const serverStatusBatchesAfter = db.serverStatus()['batchedDeletes']['batches'];
const serverStatusDocsAfter = db.serverStatus()['batchedDeletes']['docs'];
const serverStatusBatchesExpected =
serverStatusBatchesBefore + Math.ceil(collCount / docsPerBatch);
const serverStatusDocsExpected = serverStatusDocsBefore + collCount;
assert.eq(serverStatusBatchesAfter, serverStatusBatchesExpected);
assert.eq(serverStatusDocsAfter, serverStatusDocsExpected);
}
coll.drop();
assert.commandWorked(coll.insertMany(
[...Array(collCount).keys()].map(x => ({_id: x, a: "a".repeat(1024)})), {ordered: false}));
// For consistent results, don't enforce the targetBatchTimeMS and targetStagedDocBytes.
assert.commandWorked(db.adminCommand({setParameter: 1, batchedDeletesTargetBatchTimeMS: 0}));
assert.commandWorked(db.adminCommand({setParameter: 1, batchedDeletesTargetStagedDocBytes: 0}));
// Explain plan and executionStats.
{
const expl = db.runCommand({
explain: {delete: collName, deletes: [{q: {_id: {$gte: 0}}, limit: 0}]},
verbosity: "executionStats"
});
assert.commandWorked(expl);
assert(getPlanStage(expl, "BATCHED_DELETE"));
assert.eq(0, expl.executionStats.nReturned);
assert.eq(collCount, expl.executionStats.totalDocsExamined);
assert.eq(collCount, expl.executionStats.totalKeysExamined);
assert.eq(0, expl.executionStats.executionStages.nReturned);
assert.eq(1, expl.executionStats.executionStages.isEOF);
}
// Actual deletion.
for (const docsPerBatch of [10, docsPerBatchDefault]) {
assert.commandWorked(
db.adminCommand({setParameter: 1, batchedDeletesTargetBatchDocs: docsPerBatch}));
validateDeletion(db, coll, docsPerBatch);
}
}
// Standalone
{
const conn = MongoRunner.runMongod();
validateBatchedDeletes(conn);
MongoRunner.stopMongod(conn);
}
// Replica set
{
const rst = new ReplSetTest({
name: "batched_multi_deletes_test",
nodes: 2,
});
rst.startSet();
rst.initiate();
rst.awaitNodesAgreeOnPrimary();
validateBatchedDeletes(rst.getPrimary());
rst.stopSet();
}
})();
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