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/**
* Tests updates on the size and max document fields of capped collections.
*
* @tags: [
* requires_fcv_60,
* requires_capped,
* requires_collstats,
* requires_fastcount,
* # Capped collections cannot be sharded
* assumes_unsharded_collection,
* ]
*/
(function() {
load("jstests/libs/feature_flag_util.js");
const testDB = db.getSiblingDB(jsTestName());
const cappedColl = testDB["capped_coll"];
const maxSize = 25 * 1024; // 25 KB.
const doubleMaxSize = 50 * 1024; // 50 KB.
const maxDocs = 2;
const doubleMaxDocs = 2 * maxDocs;
const initialDocSize = 2;
const maxDocumentCeiling = 0x7fffffff;
const maxSizeCeiling = 0x4000000000000;
let insertDocs = function() {
// Insert ~50KB of data.
const doc = {key: "a".repeat(10 * 1024)};
for (let i = 0; i < 5; i++) {
assert.commandWorked(cappedColl.insert(doc));
}
};
let resetCappedCollection = function(extra) {
const options = Object.assign({}, {capped: true}, extra);
cappedColl.drop();
assert.commandWorked(testDB.createCollection(cappedColl.getName(), options));
// With a capped collection capacity of 25KB, we should have 2 documents.
insertDocs();
let stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, initialDocSize);
assert.lte(stats.size, extra.size);
// Check the size and max document limits.
assert.eq(stats.maxSize, extra.size);
if (extra.max) {
assert.eq(stats.max, extra.max);
}
};
let verifyLimitUpdate = function(updates) {
const fullCmd = Object.assign({}, {collMod: cappedColl.getName()}, updates);
assert.commandWorked(testDB.runCommand(fullCmd));
const stats = assert.commandWorked(cappedColl.stats());
if (updates.cappedSize) {
assert.eq(stats.maxSize, updates.cappedSize);
}
if (updates.cappedMax) {
const expectedMax = (updates.cappedMax <= 0) ? maxDocumentCeiling : updates.cappedMax;
assert.eq(stats.max, expectedMax);
}
// Insert documents after updating the capped collection limits. If the actual size is above the
// limit, the inserts will elict a deletion of documents.
insertDocs();
};
(function updateSizeLimit() {
jsTestLog("Updating the maximum size of the capped collection.");
resetCappedCollection({size: maxSize});
// Increase the size of the capped collection and we should see more documents in the
// collection.
verifyLimitUpdate({cappedSize: doubleMaxSize});
let stats = assert.commandWorked(cappedColl.stats());
assert.gt(stats.count, initialDocSize);
assert.lte(stats.size, doubleMaxSize);
// Decrease the size parameter of the capped collection and see that documents are removed.
verifyLimitUpdate({cappedSize: maxSize});
stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, initialDocSize);
assert.lte(stats.size, maxSize);
// We used to not allow resizing the size of a capped collection below 4096 bytes. This
// restriction was lifted in SERVER-67036.
// We should see a reduction in collection size and count relative to the previous test case.
verifyLimitUpdate({cappedSize: 256});
stats = assert.commandWorked(cappedColl.stats());
assert.lt(stats.count, initialDocSize);
assert.lt(stats.size, maxSize);
// We expect the resizing of a capped collection to fail when maxSize <= 0 and maxSize >
// maxSizeCeiling.
const negativeSize = -1 * maxSize;
assert.commandFailed(
testDB.runCommand({collMod: cappedColl.getName(), cappedSize: maxSizeCeiling + 1}));
assert.commandFailed(testDB.runCommand({collMod: cappedColl.getName(), cappedSize: 0}));
assert.commandFailed(
testDB.runCommand({collMod: cappedColl.getName(), cappedSize: negativeSize}));
// The maximum size can be a non-multiple of 256 bytes.
// We modify the collection to have a size multiple of 256, then
// we modify the collection to have a size non multiple of 256 and finally
// we modify the collection to have a size multiple of 256
if (FeatureFlagUtil.isEnabled(testDB, "CappedCollectionsRelaxedSize")) {
verifyLimitUpdate({cappedSize: 25 * 1024});
verifyLimitUpdate({cappedSize: 50 * 1023});
verifyLimitUpdate({cappedSize: 50 * 1024});
}
})();
(function updateMaxLimit() {
jsTestLog("Updating the maximum document size of the capped collection.");
resetCappedCollection({size: doubleMaxSize, max: maxDocs});
// Increase the size of the capped collection and we should see more documents in the
// collection.
verifyLimitUpdate({cappedMax: doubleMaxDocs});
let stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, doubleMaxDocs);
// Decrease the size parameter of the capped collection and see that documents are removed.
verifyLimitUpdate({cappedMax: maxDocs});
stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, maxDocs);
// Setting the maxDocs size to <= 0, we expect the cappedSize to be the only limiting factor.
const negativeMax = -1 * maxDocs;
verifyLimitUpdate({cappedMax: negativeMax});
stats = assert.commandWorked(cappedColl.stats());
assert.gt(stats.count, initialDocSize);
assert.lte(stats.size, doubleMaxSize);
verifyLimitUpdate({cappedMax: 0});
stats = assert.commandWorked(cappedColl.stats());
assert.gt(stats.count, initialDocSize);
assert.lte(stats.size, doubleMaxSize);
})();
(function updateSizeAndMaxLimits() {
jsTestLog("Updating the maximum size and document limits of the capped collection.");
resetCappedCollection({size: maxSize, max: maxDocs});
// Increasing both limits, we should see double the documents.
verifyLimitUpdate({cappedSize: doubleMaxSize, cappedMax: doubleMaxDocs});
let stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, doubleMaxDocs);
assert.gt(stats.size, maxSize);
// Decreasing both limits, we should see less documents.
verifyLimitUpdate({cappedSize: maxSize, cappedMax: maxDocs});
stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, maxDocs);
assert.lte(stats.size, maxSize);
// Increasing the size limit, but keeping the max low should have no effect.
verifyLimitUpdate({cappedSize: doubleMaxSize, cappedMax: maxDocs});
stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, maxDocs);
assert.lte(stats.size, doubleMaxSize);
// Increasing the max limit, but keeping the size limit lower should have no effect.
verifyLimitUpdate({cappedSize: maxSize, cappedMax: doubleMaxDocs});
stats = assert.commandWorked(cappedColl.stats());
assert.eq(stats.count, initialDocSize);
assert.lte(stats.size, maxSize);
})();
}());
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