'Write operations which don\'t write from blocks must remove the target blocks from the cache.
Returns nothing.'

def decache_block(self, course_key, version_guid, block_key):

    bulk_write_record = self._get_bulk_ops_record(course_key)
    if bulk_write_record.active:
        try:
            del bulk_write_record.modules[version_guid][block_key]
        except KeyError:
            pass
