2019-11-01老师 对一个写请求 zookeeper 服务端要做的事 1. 写wal 2.写memory datatree 3.不定期snapshot from datatree 对吧， 那这三个步骤分别对应在哪个requestprocessor？作者回复: 1. 写wal + fsync wal: SyncRequestProcessor。
写wal ：https://github.com/apache/zookeeper/blob/release-3.5.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/SyncRequestProcessor.java#L122
fsync wal：https://github.com/apache/zookeeper/blob/release-3.5.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/SyncRequestProcessor.java#L178
2. FinalRequestProcessor。
https://github.com/apache/zookeeper/blob/release-3.5.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/FinalRequestProcessor.java#L112
3. SyncRequestProcessor。
https://github.com/apache/zookeeper/blob/release-3.5.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/SyncRequestProcessor.java#L135 1
2019-11-28如果没到1000个，断电了，那会丢失事务日志？作者回复: 会的。但是这个时候ZooKeeper还没有给客户端发响应。
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