[GitHub] [pulsar] oznitecki commented on issue #9352: New Subscription mode: key_block

[GitBox <gi...@apache.org>]

oznitecki commented on issue #9352:
URL: https://github.com/apache/pulsar/issues/9352#issuecomment-770161903


   1. Key 1 messages can be processed by many consumers but only one at a time (like in key_shared). Like you said at the same time key 1 is being processed by one consumer, the others are free to take any message with different key. I think that maybe messages with same key should clamp together in some way to make it faster to skip all of them, as the order only matters in the same key and not the queue as a whole.
   2. I was thinking about 100,000 keys (1% of them update all the time and the others are sporadic) and about 10 consumers but would surely want to be able to scale (the number of consumers depends on performance)


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