linking12 created ZOOKEEPER-2155:
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Summary: network is not good, the watcher in observer env will
clear
Key: ZOOKEEPER-2155
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2155
Project: ZooKeeper
Issue Type: Bug
Components: quorum
Affects Versions: 3.4.6
Reporter: linking12
Fix For: 3.5.0
When I set up a ZooKeeper ensemble that uses Observers, The network is not very
good.
I find all of the watcher disappear.
I read the source code and find:
When the observer connect to leader, will dump the DataTree from leader and
rebuild in observer.
But the datawachers and childWatches is cleared for this operation.
WatchManager dataWatchers = zk.getZKDatabase().getDataTree()
.getDataWatches();
WatchManager childWatchers = zk.getZKDatabase().getDataTree()
.getChildWatches();
zk.getZKDatabase().clear();
zk.getZKDatabase().deserializeSnapshot(leaderIs);
zk.getZKDatabase().getDataTree().setDataWatches(dataWatchers);
zk.getZKDatabase().getDataTree().setChildWatches(childWatchers);
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