Revert ScriptBasedMapping semantics to the existing ones, add DNS mapping
diagnostics in progress
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Key: HDFS-2925
URL: https://issues.apache.org/jira/browse/HDFS-2925
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.23.0, 0.24.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Priority: Minor
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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