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https://issues.apache.org/jira/browse/ZOOKEEPER-1552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629747#comment-13629747
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Thawan Kooburat commented on ZOOKEEPER-1552:
--------------------------------------------
I think it is ok for the observer not to flush the txns to disk. All of these
txns are already committed by the participants. In the observer, writing these
txns to disk is just an optimization to make it synchronize quicker with the
leader.
> 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,
> 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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