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From "Steve Loughran (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8046) Revert StaticMapping semantics to the existing ones, add DNS mapping diagnostics in progress
Date Sat, 18 Feb 2012 12:58:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-8046:
-----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.2
                   0.24.0
           Status: Resolved  (was: Patch Available)
    
> Revert StaticMapping semantics to the existing ones, add DNS mapping diagnostics in progress
> --------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8046
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8046
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 0.24.0, 0.23.2
>
>         Attachments: HADOOP-8046.patch, HADOOP-8046.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> HADOOP-7878 still doesn't let the block manager switch to non-scripted topologies because
the static mapping is still getting it wrong -it should just look at the configuration for
a non-null script name, as per the usual {{ScriptBasedMapping}}, so as to keep tests backwards
compatible.
> In the process, make it possible to debug topologies by
> # {{#toString()}} operations to provide summary information, and for the {{CachedDNSToSwitchMapping}},
to include information on the inner mapping. {{ScriptBasedMapping}} to include the script
name.
> # {{AbstractDNSToSwitchMapping} to offer a method {{getSwitchMap()}} to return a cloned
map of the mapping, or null if this is not known.
> # {{AbstractDNSToSwitchMapping} to offer a method {{dumpTopology()}} to take this switch
map and the toString() and generate a topology dump suitable for humans.
> # Implementing the switch map method for the standard mappings (Cached -> cached map,
Static -> static map, Script -> null).
> These methods are all for debugging, but there is no reason not to use the contents of
{{getSwitchMap()}} in service web pages providing details on the service's current view of
the network topology, as it may differ from the expectations of the script author.
> time: 30m to implement, 1h30 to write more tests and run them.

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