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https://issues.apache.org/jira/browse/HDFS-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602628#comment-16602628
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Xiao Chen commented on HDFS-13890:
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Thanks for reporting and looking into this [~adam.antal]. Improvements sound ok.

Because the added column will change the output format, we may leave it off by 
default, and use an optional flag to turn this behavior on. I don't have 
concerns on passing the refIdList object around - as long as it doesn't 
significantly increase memory consumption I think it should be fine. :)

> Allow Delimited PB OIV tool to print out INodeReferences
> --------------------------------------------------------
>
>                 Key: HDFS-13890
>                 URL: https://issues.apache.org/jira/browse/HDFS-13890
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Adam Antal
>            Assignee: Adam Antal
>            Priority: Minor
>
> HDFS-9721 added the possibility to process PB-based FSImages containing 
> snapshots by simply ignoring them. 
> Although the XML tool can provide information about the snapshots, the user 
> may find helpful if this is shown within the Delimited output (in the 
> Delimited format).



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