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https://issues.apache.org/jira/browse/HADOOP-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606602#action_12606602
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Chris Douglas commented on HADOOP-3602:
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This seems like a documentation bug rather than a flaw in DataInputBuffer.
> DataInputBuffer::getLength returns the end position, not the length
> -------------------------------------------------------------------
>
> Key: HADOOP-3602
> URL: https://issues.apache.org/jira/browse/HADOOP-3602
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Chris Douglas
>
> In DataInputBuffer, a call to reset(byte[] buffer, offset, len) resets the
> data read by the buffer. However, when the offset is not zero, getLength
> returns the index marking the end of valid data in the buffer and not the
> length as specified in the last call to reset. The consequence is that
> consumers of DataInputBuffers may inaccurately gauge the length of the input
> given them.
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