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https://issues.apache.org/jira/browse/ZOOKEEPER-1032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011981#comment-13011981
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Flavio Junqueira commented on ZOOKEEPER-1032:
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Thanks for responding. I don't understand your answer for point (2), so I'll
have to review the code to try to understand what you're proposing.
> speed up recovery from leader failure
> -------------------------------------
>
> Key: ZOOKEEPER-1032
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1032
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Reporter: jiangwen wei
> Fix For: 3.4.0
>
>
> when the number of nodes is large, it may take a long time to recover from
> leader failure
> there are some points to improve:
> 1. Follower should take snapshot asynchronously when follower up to date
> 2. Currently Leader/Follower will clear the DataTree on leader failures, and
> then restore it from a snapshot and transaction logs. DataTree should not be
> cleared, only restore it from transaction logs.
> 3. FileTxnLog should store recently transaction logs in memory, so when
> DataTree is not behind the transaction logs a lot, the transaction logs in
> memory can be used to restore DataTree.
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