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https://issues.apache.org/jira/browse/HBASE-15292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231940#comment-15231940
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Hiroshi Ikeda commented on HBASE-15292:
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{quote}
Actually can PendingWatcher be omitted ?
{quote}
If you means embedding an anonymous class instead PendingWatcher, I think the
code becomes a little messy, doesn't it?
> Refined ZooKeeperWatcher to prevent ZooKeeper's callback while construction
> ---------------------------------------------------------------------------
>
> Key: HBASE-15292
> URL: https://issues.apache.org/jira/browse/HBASE-15292
> Project: HBase
> Issue Type: Bug
> Components: Zookeeper
> Reporter: Hiroshi Ikeda
> Assignee: Hiroshi Ikeda
> Priority: Minor
> Attachments: HBASE-15292-V2.patch, HBASE-15292-V3.patch,
> HBASE-15292-V4.patch, HBASE-15292.patch
>
>
> The existing code is not just messy but also contains a subtle bug of
> visibility due to missing synchronization between threads.
> The root of the evil is that ZooKeeper uses a silly anti-pattern, starting a
> thread within its constructor, and in practice all the developers are not
> allowed to use ZooKeeper correctly without tedious code.
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