[HDFS-6729] Support maintenance mode for DN - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Duplicate
Affects Version/s: 2.5.0
Fix Version/s: None
Component/s: datanode
Labels:
None

Target Version/s:

Description

Some maintenance works (e.g., upgrading RAM or add disks) on DataNode only takes a short amount of time (e.g., 10 minutes). In these cases, the users do not want to report missing blocks on this DN because the DN will be online shortly without data lose. Thus, we need a maintenance mode for a DN so that maintenance work can be carried out on the DN without having to decommission it or the DN being marked as dead.