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https://issues.apache.org/jira/browse/HDFS-2354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136011#comment-13136011
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Justin Joseph commented on HDFS-2354:
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bq. Can you explain hot it is against the goal of HDFS-1623?
HDFS-1623 aims to build a framework for HA, where there is room for multiple
approaches for HA (Shared Storage / Backup Node Based, Zookeeper / Linux HA, IP
failover / Intelligent Clients & so on). In the patch submitted for HDFS-1974,
Namenode (NamenodeRpcServer) implements the HAServiceProtocol interface &
provides the implementation based on Shared Storage approach. Now when I want
to provide another implementation based on Backup Node, I am confused how fit
it into the HA framework. This is the point I want to make.
> Generalize the HAServiceProtocol interface
> ------------------------------------------
>
> Key: HDFS-2354
> URL: https://issues.apache.org/jira/browse/HDFS-2354
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Reporter: Justin Joseph
> Assignee: Justin Joseph
> Attachments: HAService_fw_Class_Diagram.JPG, HDFS-2354.1.patch,
> HDFS-2354.patch, Namenode HA using Backup Namenode as Hot Standby.pdf
>
>
> This JIRA intends to revisit the patches committed for HADOOP-7455 and
> HDFS-1974 & to provide more generic interfaces which allows alternative HA
> implementations to co-exist complying with HAServiceProtocol.
> Some of the considerations are
> 1) Support life cycle methods (start*() and stop() APIs) in HAServiceProtocol
> 2) Support custom states in HAServiceProtocol
> 3) As per the patch submitted for HDFS-1974, Namenode implements HAService
> interface. This needs to be reconsidered.
> I will elaborate on these points, in the form of comments below.
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