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https://issues.apache.org/jira/browse/HADOOP-11626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335654#comment-14335654
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Tsuyoshi OZAWA commented on HADOOP-11626:
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[~eddyxu] Thank you for reporting this issue. In this case, this is correct
since reader.readAll reads "nread" bytes from "buf" actually. Please correct me
if I have a missing point.
> DFSInputStream should only update ReadStatistics when the read is success.
> --------------------------------------------------------------------------
>
> 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
>
>
> 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 should only record success read, i.e., after throwing {{IOE}}.
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