[ZOOKEEPER-1674] There is no need to clear & load the database across leader election

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Jacky007
• Created: 21/Mar/13 14:25
• Updated: 26/Jan/17 22:23

Description

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.

Issue Links

• is related to: ZOOKEEPER-2678 Large databases take a long time to regain a quorum