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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:
--------------------------------------
Attachment: HADOOP-10641.patch
Attaching new patch.
Here's the major updates.
# Added ZK implementation interfaces to make Agreement handling clearer.
# ZKCoordinationEngine takes a collection of ZKAgreementHandlers. It is the job
of the Handlers to type cast the Agreements. The pre-requisite to the type cast
is that ZKAgreementHandler.handles(Agreement) must return true for that very
Agreement.
# ZKCoordinationEngine executes each Agreement amongst all the
ZKAgreementHandlers. Look at ZKCoordinationEngine.executeAllHandlers().
# SampleHandler sets the GlobalSequenceNumber of the SampleProposal before
executing it.
> 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-10641.patch,
> NNThroughputBenchmark Results.pdf, ce-tla.zip, hadoop-coordination.patch,
> zkbench.pdf
>
>
> 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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