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https://issues.apache.org/jira/browse/HDDS-1881?focusedWorklogId=285927&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-285927
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ASF GitHub Bot logged work on HDDS-1881:
----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Jul/19 13:47
Start Date: 31/Jul/19 13:47
Worklog Time Spent: 10m
Work Description: hadoop-yetus commented on pull request #1196:
HDDS-1881. Design doc: decommissioning in Ozone
URL: https://github.com/apache/hadoop/pull/1196#discussion_r309212396
##########
File path: hadoop-hdds/docs/content/design/decommissioning.md
##########
@@ -0,0 +1,720 @@
+---
+title: Decommissioning in Ozone
+summary: Formal process to shut down machines in a safe way after the required
replications.
+date: 2019-07-31
+jira: HDDS-1881
+status: current
+author: Anu Engineer, Marton Elek, Stephen O'Donnell
+---
+
+
+# Abstract
+
+The goal of decommissioning is to turn off a selected set of machines without
data loss. It may or may not require to move the existing replicas of the
containers to other nodes.
+
+There are two main classes of the decommissioning:
+
+ * __Maintenance mode__: where the node is expected to be back after a while.
It may not require replication of containers if enough replicas are available
from other nodes (as we expect to have the current replicas after the restart.)
+
+ * __Decommissioning__: where the node won't be started again. All the data
should be replicated according to the current replication rules.
+
+Goals:
+
+ * Decommissioning can be canceled any time
+ * The progress of the decommissioning should be trackable
+ * The nodes under decommissioning / maintenance mode should not been used for
new pipelines / containers
+ * The state of the datanodes should be persisted / replicated by the SCM (in
HDFS the decommissioning info exclude/include lists are replicated manually by
the admin). If datanode is marked for decommissioning this state be available
after SCM and/or Datanode restarts.
Review comment:
whitespace:end of line
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Issue Time Tracking
-------------------
Worklog Id: (was: 285927)
Time Spent: 27.5h (was: 27h 20m)
> Design doc: decommissioning in Ozone
> ------------------------------------
>
> Key: HDDS-1881
> URL: https://issues.apache.org/jira/browse/HDDS-1881
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Labels: design, pull-request-available
> Time Spent: 27.5h
> Remaining Estimate: 0h
>
> Design doc can be attached to the documentation. In this jira the design doc
> will be attached and merged to the documentation page.
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