[jira] [Moved] (HADOOP-8046) Revert ScriptBasedMapping semantics to the existing ones, add DNS mapping diagnostics in progress

["Steve Loughran (Moved) (JIRA)" <ji...@apache.org>]

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

Steve Loughran moved HDFS-2925 to HADOOP-8046:
----------------------------------------------

    Affects Version/s:     (was: 0.24.0)
                           (was: 0.23.0)
                       0.24.0
                       0.23.0
                  Key: HADOOP-8046  (was: HDFS-2925)
              Project: Hadoop Common  (was: Hadoop HDFS)
    
> Revert ScriptBasedMapping 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
>   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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