DF should use used + available as the capacity of this volume
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Key: HADOOP-5735
URL: https://issues.apache.org/jira/browse/HADOOP-5735
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.20.0, 0.19.1
Environment: UNIX
Reporter: Rong-En Fan
Generally speaking, UNIX tends to keep certain percentage of disk space
reserved for root used only (can be changed via tune2fs or when mkfs).
Therefore, Hadoop's DF class should not use the 1st number in df output as the
capacity of this volume. Instead, it should use used+available as its capacity.
Otherwise, datanode may think this volume is not full but in fact it is.
The code in question is src/core/org/apache/hadoop/fs/DF.java, method
parseExecResult()
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