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https://issues.apache.org/jira/browse/CURATOR-443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan Zimmerman resolved CURATOR-443.
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Resolution: Fixed
> Sleep too long when connection to zookeeper has not been established yet
> after construction
> -------------------------------------------------------------------------------------------
>
> Key: CURATOR-443
> URL: https://issues.apache.org/jira/browse/CURATOR-443
> Project: Apache Curator
> Issue Type: Bug
> Components: Framework
> Affects Versions: 4.0.0
> Reporter: Duo Zhang
> Assignee: Jordan Zimmerman
> Fix For: 4.0.1
>
>
> Recently we purge the complicated RecoverableZooKeeper dependency in
> hbase-client and use curator to get data from zookeeper.
> But when debugging HBASE-19266, we found that if we get data immediately
> after the creation of CuratorFramework, the request will always cost 100x ms
> to complete.
> After digging, we found that there is a sleep in CuratorFrameworkImpl if the
> connection is not established yet
> https://github.com/apache/curator/blob/6d36a4793b31cdacaf4bbf6554e05d68bc680001/curator-framework/src/main/java/org/apache/curator/framework/imps/CuratorFrameworkImpl.java#L943
> This is really a bad news for us. We decide to make the async hbase client
> fully asynchronous. You can see this example, where we execute the request to
> hbase directly in the netty event loop thread.
> https://github.com/apache/hbase/blob/master/hbase-examples/src/main/java/org/apache/hadoop/hbase/client/example/HttpProxyExample.java
> So if there is a sleep in foreground then the event loop will be stuck for 1
> second which will cause very bad performance impact...
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