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https://issues.apache.org/jira/browse/ZOOKEEPER-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609021#comment-13609021
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Flavio Junqueira commented on ZOOKEEPER-1674:
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I think this issue is a duplicate, please check ZOOKEEPER-1638 and
ZOOKEEPER-1642.
> There is no need to clear & load the database across leader election
> --------------------------------------------------------------------
>
> Key: ZOOKEEPER-1674
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1674
> Project: ZooKeeper
> Issue Type: Improvement
> Reporter: Jacky007
>
> It is interesting to notice the piece of codes in QuorumPeer.java
> /* ZKDatabase is a top level member of quorumpeer
> * which will be used in all the zookeeperservers
> * instantiated later. Also, it is created once on
> * bootup and only thrown away in case of a truncate
> * message from the leader
> */
> private ZKDatabase zkDb;
> It is introduced by ZOOKEEPER-596. Now, we just drop the database every
> leader election.
> We can keep it safely with ZOOKEEPER-1549.
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