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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10641) Introduce Coordination Engine
Date Fri, 13 Jun 2014 06:39:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030312#comment-14030312
] 

Konstantin Shvachko commented on HADOOP-10641:
----------------------------------------------

Rakesh, thanks for the link. This is indeed in line with this effort.
The interface defined here is not dependent on the storage provided by Zookeeper. It only
needs the coordination piece in the form defined. So if you implement "stand-alone" ZAB it
could potentially be used as a base for CoordinationEngine.
I see the work is just starting on github - hope the internship will be fun and productive.

> Introduce Coordination Engine
> -----------------------------
>
>                 Key: HADOOP-10641
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10641
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Konstantin Shvachko
>            Assignee: Plamen Jeliazkov
>         Attachments: HADOOP-10641.patch, HADOOP-10641.patch, HADOOP-10641.patch
>
>
> Coordination Engine (CE) is a system, which allows to agree on a sequence of events in
a distributed system. In order to be reliable CE should be distributed by itself.
> Coordination Engine can be based on different algorithms (paxos, raft, 2PC, zab) and
have different implementations, depending on use cases, reliability, availability, and performance
requirements.
> CE should have a common API, so that it could serve as a pluggable component in different
projects. The immediate beneficiaries are HDFS (HDFS-6469) and HBase (HBASE-10909).
> First implementation is proposed to be based on ZooKeeper.



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