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https://issues.apache.org/jira/browse/HDFS-16253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424153#comment-17424153
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Steve Loughran commented on HDFS-16253:
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we pass through FSDataInputStream to the wrapped stream, so add your own and
it's easy to log.
* recommend printing closed/open state
* and any stats you already collect
test wise: call toString() on open & closed streams & verify no NPEs, you can
verify the output by reading the log and/or in AssertJ
> Add a toString implementation to DFSInputStream
> -----------------------------------------------
>
> Key: HDFS-16253
> URL: https://issues.apache.org/jira/browse/HDFS-16253
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Priority: Major
>
> It would help debugging if there was a useful toString on DFSInputStream.
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