[GitHub] XiaoZYang opened a new pull request #1219: Xzy initialize subscription config

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

XiaoZYang opened a new pull request #1219: Xzy initialize subscription config
URL: https://github.com/apache/incubator-pulsar/pull/1219
 
 
   ### Motivation
   
   This is a fix try for [Issue 1069](https://github.com/apache/incubator-pulsar/issues/1069), which expects a setting in consumer configuration to specify where to start consuming messages.
   
   
   ### Modifications
   1. add configuration option *initializeSubscriptionOnLatest* to class ConsumerConfiguration
   2. add an overload method for `asyncOpenCursor` in `ManageLedger` to implement different initalization position of the cursor created.
   3. modify corresponding testing class
   ### Result
   
   When a user subscribes a topic the first time, the broker will initialize the cursor the subscription on latest or earliest, which depends on the configuration option  "initializeSubscriptionOnLatest" in class ConsumerConfiguration.
   
   For more details, if user set the option "initializeSubscriptionOnLatest" to "false" when creating a new subscription the cursor will be set at the earliest position, otherwise (user doesn't set it explicitly -- use the default value or user set it to "true") at the latest position.
   

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