[GitHub] cbornet opened a new issue #3119: [Feature request] Make brokers read on closest Bookie

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

cbornet opened a new issue #3119: [Feature request] Make brokers read on closest Bookie
URL: https://github.com/apache/pulsar/issues/3119
 
 
   Rack-aware policy can be used to place bookies on different racks/AZ/regions.
   Brokers can be isolated in racks/AZ/regions with a namespace-isolation-policy (#3104). With this cross-dc bandwitdh can be minimized between clients and brokers.
   Now to minimize cross-dc bandwidth between brokers and bookies, brokers should be aware of their own rack and of the rack location of bookies. Then they can do read requests by first attempting to read on their own rack, then falling back to other racks (with speculative reads ?).
   
   References:
   * DistributedLog: https://bookkeeper.apache.org/distributedlog/docs/0.5.0/user_guide/globalreplicatedlog/main.html#cross-region-speculative-reads-1
   * Kafka: https://cwiki.apache.org/confluence/display/KAFKA/KIP-392%3A+Allow+consumers+to+fetch+from+closest+replica
   

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