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https://issues.apache.org/jira/browse/ZOOKEEPER-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222191#comment-15222191
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Patrick Hunt commented on ZOOKEEPER-1674:
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[~akshaychander] , [~thawan] , et. al. - did you folks ever end up working on
this? Someone was asking me about this issue recently and we came across this
JIRA but it hasn't been updated in some time.
> 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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