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https://issues.apache.org/jira/browse/SOLR-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734510#action_12734510
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Noble Paul commented on SOLR-1305:
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bq.With a little help from Zookeeper, is that the plan? 

not yet. Please help me with details on how  we can incorporate zookeeper into 
this. I guess it should be a pluggable 

> Notification based replication instead of polling
> -------------------------------------------------
>
>                 Key: SOLR-1305
>                 URL: https://issues.apache.org/jira/browse/SOLR-1305
>             Project: Solr
>          Issue Type: New Feature
>          Components: replication (java)
>            Reporter: Noble Paul
>             Fix For: 1.5
>
>
> 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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