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From "Subru Krishnan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-11626) Comment ReadStatistics to indicate that it tracks the actual read occurred
Date Wed, 18 Oct 2017 20:35:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-11626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Subru Krishnan updated HADOOP-11626:
------------------------------------
    Target Version/s: 3.1.0  (was: 2.9.0)

> Comment ReadStatistics to indicate that it tracks the actual read occurred
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-11626
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11626
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>            Priority: Trivial
>         Attachments: HADOOP-11626.000.patch, HADOOP-11626.001.patch, HADOOP-11626.002.patch
>
>
> In {{DFSOutputStream#actualGetFromOneDataNode()}}, it updates the {{ReadStatistics}}
even the read is failed:
> {code}
>         int nread = reader.readAll(buf, offset, len);
>         updateReadStatistics(readStatistics, nread, reader);
>         if (nread != len) {
>           throw new IOException("truncated return from reader.read(): " +
>                                 "excpected " + len + ", got " + nread);
>         }
> {code}
> It indicates that {{ReadStatistics}} tracks actual read occurred. Need to add comment
to {{ReadStatistics}} to make this clear.



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