[HDFS-1547] Improve decommission mechanism - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 0.23.0
Fix Version/s: 0.23.0
Component/s: namenode
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Reviewed
Release Note:

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Summary of changes to the decommissioning process:
# After nodes are decommissioned, they are not shutdown. The decommissioned nodes are not used for writes. For reads, the decommissioned nodes are given as the last location to read from.
# Number of live and dead decommissioned nodes are displayed in the namenode webUI.
# Decommissioned nodes free capacity is not count towards the the cluster free capacity.

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Summary of changes to the decommissioning process: # After nodes are decommissioned, they are not shutdown. The decommissioned nodes are not used for writes. For reads, the decommissioned nodes are given as the last location to read from. # Number of live and dead decommissioned nodes are displayed in the namenode webUI. # Decommissioned nodes free capacity is not count towards the the cluster free capacity.

Description

Current decommission mechanism driven using exclude file has several issues. This bug proposes some changes in the mechanism for better manageability. See the proposal in the next comment for more details.