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// Test NamespaceDetails::cappedTruncateAfter via 'captrunc' command
Random.setRandomSeed();
db.capped6.drop();
db._dbCommand( { create: "capped6", capped: true, size: 1000, $nExtents: 11, autoIndexId: false } );
tzz = db.capped6;
function debug( x ) {
// print( x );
}
/**
* Check that documents in the collection are in order according to the value
* of a, which corresponds to the insert order. This is a check that the oldest
* document(s) is/are deleted when space is needed for the newest document. The
* check is performed in both forward and reverse directions.
*/
function checkOrder( i ) {
res = tzz.find().sort( { $natural: -1 } );
assert( res.hasNext(), "A" );
var j = i;
while( res.hasNext() ) {
try {
assert.eq( val[ j-- ].a, res.next().a, "B" );
} catch( e ) {
debug( "capped6 err " + j );
throw e;
}
}
res = tzz.find().sort( { $natural: 1 } );
assert( res.hasNext(), "C" );
while( res.hasNext() )
assert.eq( val[ ++j ].a, res.next().a, "D" );
assert.eq( j, i, "E" );
}
var val = new Array( 500 );
var c = "";
for( i = 0; i < 500; ++i, c += "-" ) {
// The a values are strings of increasing length.
val[ i ] = { a: c };
}
var oldMax = Random.randInt( 500 );
var max = 0;
/**
* Insert new documents until there are 'oldMax' documents in the collection,
* then remove a random number of documents (often all but one) via one or more
* 'captrunc' requests.
*/
function doTest() {
for( var i = max; i < oldMax; ++i ) {
tzz.insert( val[ i ] );
}
max = oldMax;
count = tzz.count();
var min = 1;
if ( Random.rand() > 0.3 ) {
min = Random.randInt( count ) + 1;
}
// Iteratively remove a random number of documents until we have no more
// than 'min' documents.
while( count > min ) {
// 'n' is the number of documents to remove - we must account for the
// possibility that 'inc' will be true, and avoid removing all documents
// from the collection in that case, as removing all documents is not
// allowed by 'captrunc'
var n = Random.randInt( count - min - 1 ); // 0 <= x <= count - min - 1
var inc = Random.rand() > 0.5;
debug( count + " " + n + " " + inc );
assert.commandWorked( db.runCommand( { captrunc:"capped6", n:n, inc:inc } ) );
if ( inc ) {
n += 1;
}
count -= n;
max -= n;
// Validate the remaining documents.
checkOrder( max - 1 );
}
}
// Repeatedly add up to 'oldMax' documents and then truncate the newest
// documents. Newer documents take up more space than older documents.
for( var i = 0; i < 10; ++i ) {
doTest();
}
// reverse order of values
var val = new Array( 500 );
var c = "";
for( i = 499; i >= 0; --i, c += "-" ) {
val[ i ] = { a: c };
}
db.capped6.drop();
db._dbCommand( { create: "capped6", capped: true, size: 1000, $nExtents: 11, autoIndexId: false } );
tzz = db.capped6;
// Same test as above, but now the newer documents take less space than the
// older documents instead of more.
for( var i = 0; i < 10; ++i ) {
doTest();
}
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