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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