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https://issues.apache.org/jira/browse/ZOOKEEPER-1552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591250#comment-13591250
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Thawan Kooburat commented on ZOOKEEPER-1552:
--------------------------------------------

I can change list this a bug instead of an improvement, so that it is eligible 
for 3.4 branch. When we use the observer, we expected that it will also write 
to txnlog but it actually don't. 
                
> Enable sync request processor in Observer
> -----------------------------------------
>
>                 Key: ZOOKEEPER-1552
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1552
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: quorum, server
>    Affects Versions: 3.4.3
>            Reporter: Thawan Kooburat
>            Assignee: Thawan Kooburat
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1552.patch, ZOOKEEPER-1552.patch
>
>
> Observer doesn't forward its txns to SyncRequestProcessor. So it never 
> persists the txns onto disk or periodically creates snapshots. This increases 
> the start-up time since it will get the entire snapshot if the observer has 
> be running for a long time. 

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