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https://issues.apache.org/jira/browse/HADOOP-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052297#comment-14052297
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Rakesh R commented on HADOOP-10641:
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Hi [~posix4e],
bq. zab or zk?
ZAB is an fresh project idea and this is in the initial phase. I'm not having
much details now. Please follow ZOOKEEPER-1931 to know more on this.
Motivation - there could be many use cases where you need a quorum based
replication. So fresh thought came up to define consensus algorithm (ZAB) more
cleanly so that the users can define their own data models and use ZAB to
replicate their own data.
Actually after seeing 'Coordination Engine' feature in HDFS, I thought of
introducing this new idea.
> 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, 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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