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// Test capped collection truncate via 'emptycapped' command
Random.setRandomSeed();
db.capped7.drop();
db._dbCommand({create: "capped7", capped: true, size: 1000, $nExtents: 11, autoIndexId: false});
tzz = db.capped7;
var ten = new Array(11).toString().replace(/,/g, "-");
count = 0;
/**
* Insert new documents until the capped collection loops and the document
* count doesn't increase on insert.
*/
function insertUntilFull() {
count = tzz.count();
var j = 0;
while (1) {
tzz.save({i: ten, j: j++});
var newCount = tzz.count();
if (count == newCount) {
break;
}
count = newCount;
}
}
insertUntilFull();
// oldCount == count before empty
oldCount = count;
assert.eq.automsg("11", "tzz.stats().numExtents");
// oldSize == size before empty
var oldSize = tzz.stats().storageSize;
assert.commandWorked(db._dbCommand({emptycapped: "capped7"}));
// check that collection storage parameters are the same after empty
assert.eq.automsg("11", "tzz.stats().numExtents");
assert.eq.automsg("oldSize", "tzz.stats().storageSize");
// check that the collection is empty after empty
assert.eq.automsg("0", "tzz.find().itcount()");
assert.eq.automsg("0", "tzz.count()");
// check that we can reuse the empty collection, inserting as many documents
// as we were able to the first time through.
insertUntilFull();
assert.eq.automsg("oldCount", "count");
assert.eq.automsg("oldCount", "tzz.find().itcount()");
assert.eq.automsg("oldCount", "tzz.count()");
assert.eq.automsg("11", "tzz.stats().numExtents");
var oldSize = tzz.stats().storageSize;
assert.commandWorked(db._dbCommand({emptycapped: "capped7"}));
// check that the collection storage parameters are unchanged after another empty
assert.eq.automsg("11", "tzz.stats().numExtents");
assert.eq.automsg("oldSize", "tzz.stats().storageSize");
// insert an arbitrary number of documents
var total = Random.randInt(2000);
for (var j = 1; j <= total; ++j) {
tzz.save({i: ten, j: j});
// occasionally check that only the oldest documents are removed to make room
// for the newest documents
if (Random.rand() > 0.95) {
assert.automsg("j >= tzz.count()");
assert.eq.automsg("tzz.count()", "tzz.find().itcount()");
var c = tzz.find().sort({$natural: -1});
var k = j;
assert.automsg("c.hasNext()");
while (c.hasNext()) {
assert.eq.automsg("c.next().j", "k--");
}
// check the same thing with a reverse iterator as well
var c = tzz.find().sort({$natural: 1});
assert.automsg("c.hasNext()");
while (c.hasNext()) {
assert.eq.automsg("c.next().j", "++k");
}
assert.eq.automsg("j", "k");
}
}
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