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https://issues.apache.org/jira/browse/HDFS-13658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536799#comment-16536799
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Kitti Nanasi commented on HDFS-13658:
-------------------------------------
Thanks [~xiaochen] for the comments! In patch v007 I modified the code so it
doesn't use LowRedundancyBlocks anymore, but updates the one replica metric
every time a replica is added or removed in BlockManager. And because I can't
test the new code via TestLowRedundancyBlockQueues, I wrote some other tests in
TestOneReplicaBlocksAlert.
> fsck, dfsadmin -report, and NN WebUI should report number of blocks that have
> 1 replica
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-13658
> URL: https://issues.apache.org/jira/browse/HDFS-13658
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.1.0
> Reporter: Kitti Nanasi
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-13658.001.patch, HDFS-13658.002.patch,
> HDFS-13658.003.patch, HDFS-13658.004.patch, HDFS-13658.005.patch,
> HDFS-13658.006.patch, HDFS-13658.007.patch
>
>
> fsck, dfsadmin -report, and NN WebUI should report number of blocks that have
> 1 replica. We have had many cases opened in which a customer has lost a disk
> or a DN losing files/blocks due to the fact that they had blocks with only 1
> replica. We need to make the customer better aware of this situation and that
> they should take action.
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