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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15292) Refined ZooKeeperWatcher to prevent ZooKeeper's callback while construction
Date Fri, 06 May 2016 00:07:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273355#comment-15273355
] 

Hudson commented on HBASE-15292:
--------------------------------

FAILURE: Integrated in HBase-Trunk_matrix #896 (See [https://builds.apache.org/job/HBase-Trunk_matrix/896/])
HBASE-15292 Refined ZooKeeperWatcher to prevent ZooKeeper's callback (tedyu: rev 8b0ce77942e99751394cc23a40436d9f20d4254c)
* hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/InstancePending.java
* hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/PendingWatcher.java
* hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
* hbase-client/src/test/java/org/apache/hadoop/hbase/zookeeper/TestInstancePending.java


> 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
>             Fix For: 2.0.0, 1.3.0, 1.4.0
>
>         Attachments: HBASE-15292-V2.patch, HBASE-15292-V3.patch, HBASE-15292-V4.patch,
HBASE-15292-V5.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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