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https://issues.apache.org/jira/browse/HADOOP-7992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193215#comment-13193215
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Bikas Saha commented on HADOOP-7992:
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>From previous discussions on
>[HDFS-2185|https://issues.apache.org/jira/browse/HDFS-2185] it seemed that
>writing a simple library for our own needs was a choice no one disagreed on.
>It also makes sense because this library could be enhanced more painlessly for
>future needs.
>From my reading of the curator code, it brings in a fair bit of complexity
>because it builds a general ZK framework on top on which recipes are
>implemented. Secondly, it seemed that the leader election recipe worked by
>electing a leader, that holds onto leadership via not returning from a
>blocking call. When that call returns then leadership is given up. I might be
>wrong but it was not obvious to me how this would handle environmental errors
>which cause the leadership to be lost because of external errors.
> Add ZK client for leader election
> ---------------------------------
>
> Key: HADOOP-7992
> URL: https://issues.apache.org/jira/browse/HADOOP-7992
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ha
> Reporter: Suresh Srinivas
> Assignee: Bikas Saha
> Fix For: HA Branch (HDFS-1623)
>
> Attachments: HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch,
> HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch,
> HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch,
> HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch,
> HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch, HDFS-2681.txt,
> HDFS-2681.txt, Zookeeper based Leader Election and Monitoring Library.pdf
>
>
> ZKClient needs to support the following capabilities:
> # Ability to create a znode for co-ordinating leader election.
> # Ability to monitor and receive call backs when active znode status changes.
> # Ability to get information about the active node.
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