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https://issues.apache.org/jira/browse/HDFS-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177079#comment-13177079
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Harsh J commented on HDFS-4:
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Are there any other disadvantages you can think of in going with
used+available? Any edge cases where that sum may be incorrect to use?
> DF should use used + available as the capacity of this volume
> -------------------------------------------------------------
>
> Key: HDFS-4
> URL: https://issues.apache.org/jira/browse/HDFS-4
> Project: Hadoop HDFS
> Issue Type: Bug
> Environment: UNIX
> Reporter: Rong-En Fan
> Labels: newbie
>
> 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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