Github user vsair commented on the issue:

    https://github.com/apache/incubator-rocketmq/pull/82
  
    Hi, Jaskey;
    
    Thanks for your question.
    
    1. It will decode the properties to do calculation at that case.
    2. When they are changed, the consumer's subscription will be ignored when
    starting, so the results int bloom filter  also will be ignored. That is
    mean server will do calculation again and not update the results already
    existed in Store.
    
    
    Thanks,
    Vsair
    
    
    On Mon, Jun 12, 2017 at 2:47 PM, Jaskey <[email protected]> wrote:
    
    > @vsair <https://github.com/vsair>
    >
    > I have two things to confirms,
    >
    >    1.
    >
    >    if the old messages which exists before consumer subscribe with the
    >    filter expression must be filtered by decodng properties to do 
calculation ?
    >    2.
    >
    >     `expectConsumerNumUseFilter = 32` and `maxErrorRateOfBloomFilter = 
20` can be configured and changed, what if I change this value and restart, 
does the calculated results in the ConsumeQueueExt updated accordingly?
    >
    >
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