Question

Dear communtity. I has a very strange leak, which i can’t catch up by instruments. Application eat a memory very quickly from 200M to 450M for one cycle of removing. Call threes list for objects list show me that a problem in NSManagedObjectContext NSFetchRequest-> processRecentChanges-> propagatePendingDeletesAtEndOfEvent.
Data amount is not big, current sqllite store is 37Mb, and memory doesn’t free after process is done.

NSError *error = nil;
NSManagedObjectContext *moc = [self managedObjectContext];
NSFetchRequest *requestCarrier = [[NSFetchRequest alloc] init];
[requestCarrier setEntity:[NSEntityDescription entityForName:@"DestinationsListForSale"
                                      inManagedObjectContext:moc]];
[requestCarrier setPredicate:[NSPredicate predicateWithFormat:@"(carrier.name == %@)",
                              carrierName]];
NSArray *destinationsListsForSale = [moc executeFetchRequest:requestCarrier error:&error];

if (error) NSLog(@"Failed to executeFetchRequest to data store: %@", [error localizedDescription]); 
for (NSManagedObject *destinationForSale in destinationsListsForSale) [moc deleteObject:destinationForSale];


[requestCarrier release], requestCarrier = nil;
destinationsListsForSale = nil;

requestCarrier = [[NSFetchRequest alloc] init];

[requestCarrier setEntity:[NSEntityDescription entityForName:@"DestinationsListWeBuy" inManagedObjectContext:moc]];
[requestCarrier setPredicate:[NSPredicate predicateWithFormat:@"(carrier.name == %@)", carrierName]];
NSArray *destinationsListsWeBuy = [moc executeFetchRequest:requestCarrier error:&error];
if (error) NSLog(@"Failed to executeFetchRequest to data store: %@", [error localizedDescription]); 
for (NSManagedObject *destinationWeBuy in destinationsListsWeBuy) [moc deleteObject:destinationWeBuy];

[requestCarrier release], requestCarrier = nil;
destinationsListsWeBuy = nil;

SOLUTION v.1
rebuild code to move out problem

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
for (NSManagedObject *destination in destinationsList)
{
    [moc deleteObject:destination];
    if (x % 10 == 0) {
        [moc save:&error];
        if (error) NSLog(@"Failed to save to data store removePreviousDestinationsFromMainDatabaseForCarrier: %@", [error localizedDescription]);
        [pool drain],pool = nil;
        pool = [[NSAutoreleasePool alloc] init];
    }
    x++;
}

Answer 1

Have you tried just fetching the NSMangedObjectID in your code, as suggested in this answer?