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Posted to common-dev@hadoop.apache.org by "Rong-En Fan (JIRA)" <ji...@apache.org> on 2009/04/24 08:13:30 UTC

[jira] Created: (HADOOP-5735) DF should use used + available as the capacity of this volume

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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