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From "Plamen Jeliazkov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10641) Introduce Coordination Engine
Date Fri, 06 Jun 2014 19:41:03 GMT

     [ 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

New patch. Not clear what I was doing earlier. Indeed the correct usage here is to have agreement
executions call the learner, not the other way around.

# Factored out SampleLearner.
# SampleProposal now does <SampleLearner,Void>.
# Added setCurrentUser to SampleProposal.
# Made SampleLearner use UserGroupInformation.doAs when executing agreement.
# Removed LICENSE and NOTICE files. Sorry about that.
# Unit tests now correctly wait for all agreements to arrive (they were not prior).
# Made use of ClientBase in MiniZooKeeperCluster.

> 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
> 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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