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// Compaction of a v0 index converts it to a v1 index using a v1 index comparator during external
// sort. SERVER-6499
t = db.jstests_compact2;
t.drop();
/**
* Assert that the index is of the expected version and its keys are ordered consistently with this
* version, and that the unique and background fields are set correctly.
*/
function assertIndex( expectedVersion, unique, background ) {
indexSpec = db.system.indexes.findOne( { ns:t.toString(), key:{ date:1 } } );
// The index version is as expected.
assert.eq( expectedVersion, indexSpec.v );
// The index uniqueness is as expected (treat missing and false unique specs as equivalent).
assert.eq( !unique, !indexSpec.unique );
// Background is as expected.
assert.eq( !background, !indexSpec.background );
// Check that 'date' key ordering is consistent with the index version.
dates = t.find().hint( { date:1 } ).toArray().map( function( x ) { return x.date; } );
if ( expectedVersion == 0 ) {
// Under v0 index comparison, new Date( -1 ) > new Date( 1 ).
assert.eq( [ new Date( 1 ), new Date( -1 ) ], dates );
}
else {
// Under v1 index comparsion, new Date( -1 ) < new Date( 1 ).
assert.eq( [ new Date( -1 ), new Date( 1 ) ], dates );
}
}
/** Compact a collection and check the resulting indexes. */
function checkCompact( originalVersion, unique, background ) {
t.drop();
t.save( { date:new Date( 1 ) } );
t.save( { date:new Date( -1 ) } );
t.ensureIndex( { date:1 }, { unique:unique, v:originalVersion, background:background } );
assertIndex( originalVersion, unique, background );
// Under SERVER-6499, compact fails when a v0 index is converted to a v1 index and key
// comparisons are inconsistent, as with the date values in this test.
assert.commandWorked( t.runCommand( "compact" ) );
assert( !db.getLastError() );
// Compact built an index with the default index version (v1). Uniqueness is maintained, but
// background always becomes false.
assertIndex( 1, unique, false );
}
checkCompact( 0, true, true );
checkCompact( 0, false, false );
checkCompact( 1, true, false );
checkCompact( 1, false, true );
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