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From "MaoYuan Xian (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10434) Is it possible to use "df" to calculating the dfs usage indtead of "du"
Date Tue, 25 Mar 2014 07:35:42 GMT
MaoYuan Xian created HADOOP-10434:
-------------------------------------

             Summary: Is it possible to use "df" to calculating the dfs usage indtead of "du"
                 Key: HADOOP-10434
                 URL: https://issues.apache.org/jira/browse/HADOOP-10434
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
    Affects Versions: 2.3.0
            Reporter: MaoYuan Xian
            Priority: Minor


When we run datanode from the machine with big disk volume, it's found du operations from
org.apache.hadoop.fs.DU's DURefreshThread cost lots of disk performance.

As we use the whole disk for hdfs storage, it is possible calculate volume usage via "df"
command. Is it necessary adding the "df" option for usage calculation in hdfs (org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice)?



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