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https://issues.apache.org/jira/browse/HDFS-11257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15769037#comment-15769037
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Andrew Wang commented on HDFS-11257:
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There's also some overlap between this proposal and the SPS work at HDFS-10285.
I think this JIRA is basically asking for the NN to perform the
responsibilities of the Balancer. Might not be a small task considering the
number of subtasks on HDFS-10285 for the Mover.
> Evacuate DN when the remaining is negative
> ------------------------------------------
>
> Key: HDFS-11257
> URL: https://issues.apache.org/jira/browse/HDFS-11257
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.7.3
> Reporter: Inigo Goiri
>
> Datanodes have a maximum amount of disk they can use. This is set using
> {{dfs.datanode.du.reserved}}. For example, if we have a 1TB disk and we set
> the reserved to 100GB, the DN can only use ~900GB. However, if we fill the DN
> and later other processes (e.g., logs or co-located services) start to use
> the disk space, the remaining space will go to a negative and the used
> storage >100%.
> The Rebalancer or decommissioning would cover this situation. However, both
> approaches require administrator intervention while this is a situation that
> violates the settings. Note that decommisioning, would be too extreme as it
> would evacuate all the data.
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