Flushing Object Cache Needed when Comment Posted

When a comment is posted, the recent comments widget is not updated unless I manually flush the object cache. Is there a function I can use when the comment posted hook is triggered, or is there another recommended approach so the comment is pushed to the widget? Something such as:

function cm_flush_object_cache( $comment_ID, $comment_approved ) {
	if( 1 === $comment_approved ){
	  //object flush cache logic goes here
	}
}
add_action( 'comment_post', 'cm_flush_object_cache', 10, 2 );

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