sijie commented on issue #3804: ManagedLedger should streamline the read 
requests
URL: https://github.com/apache/pulsar/issues/3804#issuecomment-472014740
 
 
   I have seen in a production deployment the consumer can never catch up if 
bookie's avg read latency is 10+ms bad due to the disk and other workloads 
running on same machine. the problem can potentially be mitigated if we can 
have a proper readahead mechanism in managed like what dlog is doing. 

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