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https://issues.apache.org/jira/browse/HDDS-1649?focusedWorklogId=280106&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-280106
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ASF GitHub Bot logged work on HDDS-1649:
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Author: ASF GitHub Bot
Created on: 20/Jul/19 15:55
Start Date: 20/Jul/19 15:55
Worklog Time Spent: 10m
Work Description: bharatviswa504 commented on issue #948: HDDS-1649. On
installSnapshot notification from OM leader, download checkpoint and reload OM
state
URL: https://github.com/apache/hadoop/pull/948#issuecomment-513478596
Rebased with latest trunk.
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Issue Time Tracking
-------------------
Worklog Id: (was: 280106)
Time Spent: 12.5h (was: 12h 20m)
> On installSnapshot notification from OM leader, download checkpoint and
> reload OM state
> ---------------------------------------------------------------------------------------
>
> Key: HDDS-1649
> URL: https://issues.apache.org/jira/browse/HDDS-1649
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Reporter: Hanisha Koneru
> Assignee: Hanisha Koneru
> Priority: Major
> Labels: pull-request-available
> Time Spent: 12.5h
> Remaining Estimate: 0h
>
> Installing a DB checkpoint on the OM involves following steps:
> 1. When an OM follower receives installSnapshot notification from OM leader,
> it should initiate a new checkpoint on the OM leader and download that
> checkpoint through Http.
> 2. After downloading the checkpoint, the StateMachine must be paused so that
> the old OM DB can be replaced with the new downloaded checkpoint.
> 3. The OM should be reloaded with the new state . All the services having a
> dependency on the OM DB (such as MetadataManager, KeyManager etc.) must be
> re-initialized/ restarted.
> 4. Once the OM is ready with the new state, the state machine must be
> unpaused to resume participating in the Ratis ring.
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