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https://issues.apache.org/jira/browse/HADOOP-11626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei (Eddy) Xu reassigned HADOOP-11626:
--------------------------------------
Assignee: (was: Lei (Eddy) Xu)
> 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
> 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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