add configuration methods to handle human readable size values
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Key: HADOOP-7910
URL: https://issues.apache.org/jira/browse/HADOOP-7910
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Reporter: Sho Shimauchi
Priority: Minor
It's better to have a new configuration methods which handle human readable
size values.
For example, see HDFS-1314.
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