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https://issues.apache.org/jira/browse/HADOOP-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14026015#comment-14026015
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Konstantin Shvachko commented on HADOOP-10641:
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> reliable distributed coordination, which is not what Hadoop aims to do at all.
Not sure where this leaves QJM. I thought it satisfies all these requirements
including the Hadoop's aim.
Anyways, we have it, and we also do distributed coordination between active and
standby NNs, RMs.
Hadoop common is chosen for the coordination engine interface as the lowest
common ancestor. It could be used for anything Hadoop from here: HDFS, HBase,
Yarn. I don't have other use cases for it in my mind at the moment. Did not
have enough experience with TLPs and Incubators, but thought it needs like
something bigger. Say, in this case, implementations for more than one CE.
Sorry if I misunderstood you, but if you want to take it to Apache Incubator
I'll be on your side.
> 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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