speed up recovery from leader failures
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Key: ZOOKEEPER-1032
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1032
Project: ZooKeeper
Issue Type: Improvement
Components: server
Reporter: jiangwen wei
when the number of nodes is large, it may take a long time to recover from
leader failures
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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