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https://issues.apache.org/jira/browse/HDFS-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085973#comment-13085973
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Suresh Srinivas commented on HDFS-2231:
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bq. I've asked this many times. It seems that you are building a universal HA
framework that would fit multiple approaches.
I have answered it many times :-) The requirements considered were:
# Non shared vs shared approach
# IP failover vs no IP failover
These multiple approaches are considered because, some folks (working on this
jira) want a solution with no special hardware, no IP failover, and want to use
the shared state approach. Your preference and few other jira posts indicate
preference to use BackupNode and possibly IP failover.
bq. If so that would be "trying to do too much" as Allen states. E.g. with IP
failover approach you probably don't need any configuration changes.
I see. How do you send block reports from datanodes to two namenodesoun
In the prototype you have:
# Backup node configuration is used as place holder for second namenode, with
very confusing backup node becoming active etc. We have gone over this before.
# All the configuration requirement discussed in this jira, you have moved it
to the load balancer. It is not that you do not have it.
bq. The configuration parameters should be the same for Backup and Standby
nodes. As these are only different roles of the single NodeNode. If some of
existing parameters need to be reasonably renamed I'm for it.
The proposal here keeps backward compatibility for configurations using backup
node (not sure if any one is using it!). Second set of params are added for
second namenode. I am okay renaming backup node configurations to do this, if
you are confident it will not affect existing setups. Please provide a detailed
design.
> Configuration changes for HA namenode
> -------------------------------------
>
> Key: HDFS-2231
> URL: https://issues.apache.org/jira/browse/HDFS-2231
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: HA branch (HDFS-1623)
>
>
> This jira tracks the changes required for configuring HA setup for namenodes.
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