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// Test NamespaceDetails::cappedTruncateAfter with empty extents
Random.setRandomSeed();
t = db.jstests_capped8;
function debug(x) {
// printjson( x );
}
/** Generate an object with a string field of specified length */
function obj(size, x) {
return {X: x, a: new Array(size + 1).toString()};
}
function withinTwo(a, b) {
assert(Math.abs(a - b) <= 2, "not within one: " + a + ", " + b);
}
var X = 0;
/**
* Insert enough documents of the given size spec that the collection will
* contain only documents having this size spec.
*/
function insertManyRollingOver(objsize) {
// Add some variability, as the precise number can trigger different cases.
X++;
n = 250 + Random.randInt(10);
assert(t.count() == 0 || t.findOne().X != X);
for (i = 0; i < n; ++i) {
t.save(obj(objsize, X));
debug(t.count());
}
if (t.findOne().X != X) {
printjson(t.findOne());
print("\n\nERROR didn't roll over in insertManyRollingOver " + objsize);
print("approx amountwritten: " + (objsize * n));
printjson(t.stats());
assert(false);
}
}
/**
* Insert some documents in such a way that there may be an empty extent, then
* truncate the capped collection.
*/
function insertAndTruncate(first) {
myInitialCount = t.count();
// Insert enough documents to make the capped allocation loop over.
insertManyRollingOver(150);
myFiftyCount = t.count();
// Insert documents that are too big to fit in the smaller extents.
insertManyRollingOver(3000);
myTwokCount = t.count();
if (first) {
initialCount = myInitialCount;
fiftyCount = myFiftyCount;
twokCount = myTwokCount;
// Sanity checks for collection count
assert(fiftyCount > initialCount);
assert(fiftyCount > twokCount);
} else {
// Check that we are able to insert roughly the same number of documents
// after truncating. The exact values are slightly variable as a result
// of the capped allocation algorithm and where the remaining entry is.
withinTwo(initialCount, myInitialCount);
withinTwo(fiftyCount, myFiftyCount);
withinTwo(twokCount, myTwokCount);
}
count = t.count();
// Check that we can truncate the collection successfully.
assert.commandWorked(db.runCommand({captrunc: "jstests_capped8", n: count - 1, inc: false}));
assert.eq(1, t.count());
}
/** Test truncating and subsequent inserts */
function testTruncate() {
insertAndTruncate(true);
insertAndTruncate(false);
insertAndTruncate(false);
}
var pass = 1;
print("pass " + pass++);
t.drop();
db._dbCommand({create: "jstests_capped8", capped: true, $nExtents: [10000, 10000, 4000]});
testTruncate();
print("pass " + pass++);
t.drop();
db._dbCommand({create: "jstests_capped8", capped: true, $nExtents: [10000, 1000, 4000]});
testTruncate();
print("pass " + pass++);
t.drop();
db._dbCommand({create: "jstests_capped8", capped: true, $nExtents: [10000, 4000]});
testTruncate();
print("pass " + pass++);
t.drop();
db._dbCommand({create: "jstests_capped8", capped: true, $nExtents: [10000]});
testTruncate();
t.drop();
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