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https://issues.apache.org/jira/browse/HDFS-8849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652427#comment-14652427
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Zhe Zhang commented on HDFS-8849:
---------------------------------

Thanks for the input Allen. I guess there's still a small gap. Even when we 
know 1) the number of missing blocks; 2) number of blocks below min 
replication, it's not always possible to calculate the number of blocks meeting 
both conditions. So agreed that it's partially covered. This JIRA will just 
fill in the small gap.

> fsck should report number of missing blocks with replication factor 1
> ---------------------------------------------------------------------
>
>                 Key: HDFS-8849
>                 URL: https://issues.apache.org/jira/browse/HDFS-8849
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: tools
>    Affects Versions: 2.7.1
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>            Priority: Minor
>
> HDFS-7165 supports reporting number of blocks with replication factor 1 in 
> {{dfsadmin}} and NN metrics. But it didn't extend {{fsck}} with the same 
> support, which is the aim of this JIRA.



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