[HADOOP-7956] Remove duplicate definition of default config values

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: conf
• Assignee: Unassigned
• Reporter: Eli Collins
• Created: 04/Jan/12 20:12
• Updated: 14/May/13 02:03

Description

We define default configuration values in two places:
#1 The default.xml files (eg core-default.xml)
#2 The _DEFAULT defines in *Keys.java

This means the defaults used in the code may or may not be dead code based on whether the config is present in the default xml file. Would be good to define these in one place. Eg:
#1 Just have the defines in the code and figure out how to make those accessible as a loadable resource (eg could generate the default files from the defines in the KeysPublic* files)
#2 Remove one of the definitions entirely (possible to live w/o the default files?) or
#3 Remove the overlap between the code and default files

Issue Links

• is duplicated by: HDFS-4820 Remove hdfs-default.xml
• is related to: HADOOP-7949 Updated maxIdleTime default in the code to match core-default.xml
• is related to: HADOOP-7313 Remove all framework use of Configuration default args
• relates to: YARN-673 Remove yarn-default.xml