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https://issues.apache.org/jira/browse/HADOOP-6420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789163#action_12789163
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Aaron Kimball commented on HADOOP-6420:
---------------------------------------
This is used for MAPREDUCE-1126. In HADOOP-6165, the serialization system was
changed such that serialization metadata is defined as a {{Map<String,
String>}} with an arbitrary set of (key, value) pairs inside.
To support more serialization formats than just WritableSerialization, we need
to allow these arbitrary maps of data to be specified by the user via the job's
{{Configuration}}. Thus, much as how we have defined mechanisms to embed ints,
booleans, and lists of strings in the Configuration, we need to expand the set
of datatypes we can embed in the configuration to also include maps of
string->string. This does so without needing to worry about escape characters
or other clumsiness that would result via embedding a single (k, v) pair in the
Configuration.
> String-to-String Maps should be embeddable in Configuration
> -----------------------------------------------------------
>
> Key: HADOOP-6420
> URL: https://issues.apache.org/jira/browse/HADOOP-6420
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: HADOOP-6420.2.patch, HADOOP-6420.3.patch,
> HADOOP-6420.4.patch, HADOOP-6420.patch
>
>
> Per MAPREDUCE-1126, we need to be able to take a map of (key, value) pairs
> and embed that inside a Configuration object.
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