[jira] [Created] (HDFS-11257) Evacuate DN when the remaining is negative

["Inigo Goiri (JIRA)" <ji...@apache.org>]

Inigo Goiri created HDFS-11257:
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             Summary: 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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