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Date: Mon, 4 Aug 2014 18:20:15 +0000 (UTC)
From: "Plamen Jeliazkov (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-10641) Introduce Coordination Engine
 interface
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     [ https://issues.apache.org/jira/browse/HADOOP-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Plamen Jeliazkov updated HADOOP-10641:
--------------------------------------

    Attachment: HADOOP-10641.patch

Attaching new patch, here are the changes I've made:
# Moved updateCurrentGSN() to after executeAgreement(). We will replay the agreement if we crashed before updating the GSN in ZK.
# Removed the ProposalReturnCode(s). We will just return if submission was successful. Exception if unsuccessful.
# Renamed ProposalNotAcceptedException to ProposalSubmissionException.
# NoQuorumException now extends ProposalSubmissionException.

> Introduce Coordination Engine interface
> ---------------------------------------
>
>                 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, HADOOP-10641.patch, hadoop-coordination.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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