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https://issues.apache.org/jira/browse/HADOOP-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Plamen Jeliazkov updated HADOOP-10641:
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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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