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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2808) HA: Use logical names in haadmin
Date Thu, 02 Feb 2012 18:02:53 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HDFS-2808:
------------------------------

    Attachment: hdfs-2808.txt

As part of switching from host:ipc targets to logical namenode IDs we need to know the namespace
to use to resolve the namenode IDs. If federation is not configured there will be just on
namespace configured so we can use it automatically. Otherwise however we'll need to determine
which nameservice to use. Some options:

- Require the ns be passed as part of the target eg <nsId.nnId>. I don't like this option
since it allows for different namespaces to be specified in operations like failover.
- Require a nameservice be passed explicitly (via dfs.federation.nameservice.id) in the config
used to run the haadmin command. I don't like this option as it requires using a different
config for haadmin.
- Rework HAadmin to work more like a typical shell, ie "bin/hdfs haadmin [OPTION].. [ARG]..."
instead of requiring commands start with a slash and are always the first argument.
- Rework HAAdmin to handle generic options like dfsadmin
eg bin/hdfs dfsadmin [genericOptions] [commandOptions]

I think I'll go with the latter to be consistent with dfsadmin.

In the meantime here's a patch which works as long as there's only one configured namespace.
I'll rework haadmin in another change and then layer this change atop it.

                
> HA: Use logical names in haadmin
> --------------------------------
>
>                 Key: HDFS-2808
>                 URL: https://issues.apache.org/jira/browse/HDFS-2808
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hdfs-2808.txt
>
>
> Currently haadmin services are specified by host:ipcport, we should use a logical names
instead, eg dfs.ha.namenode.id when the service is a namenode.

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