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https://issues.apache.org/jira/browse/HDDS-1649?focusedWorklogId=279320&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-279320
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ASF GitHub Bot logged work on HDDS-1649:
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Author: ASF GitHub Bot
Created on: 18/Jul/19 20:48
Start Date: 18/Jul/19 20:48
Worklog Time Spent: 10m
Work Description: hanishakoneru 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-512981397
> **Question:**
> In ShouldInstallSnapshot, it calls getLatestSnapshot() from
stateMachineStorage, as we have our own snapshot implementation in
stateMachine, do we need to override that method to provide correct
snapshotInfo? Or could you provide some info how this works?
We do not want the snapshots to be handled via Ratis. When a follower
receives installSnaphsot notification, it sends the new loaded DB's snapshot
index back to the leader. The leader updates the followers snaphsot index
through this.
But when Ratis server is starting up, it should be able to determine the
latest snapshot index. Otherwise, all the logs will be replayed from the start.
I will create a new Jira to address this. Thanks Bharat.
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Issue Time Tracking
-------------------
Worklog Id: (was: 279320)
Time Spent: 9h (was: 8h 50m)
> 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: 9h
> 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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