Notification based replication instead of polling
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                 Key: SOLR-1305
                 URL: https://issues.apache.org/jira/browse/SOLR-1305
             Project: Solr
          Issue Type: New Feature
          Components: replication (java)
            Reporter: Noble Paul


Currently the only way for the slave to know about the availability of of new 
commit points is by polling. This means slaves should 'poll'  very frequently  
to ensure that it gets the commit point immediately. if the changes to the 
master is less frequent, then this can be an unnecessary overhead. If would be 
nice if the slave can register itself with the master for notification on 
availability of new changes. After receiving the notification , the slave can 
trigger a poll and do what it does now.  This may require SOLR-727 so that the 
slave can register its url with the master

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