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Posted to hdfs-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2019/07/22 19:08:00 UTC
[jira] [Commented] (HDDS-1649) On installSnapshot notification from
OM leader, download checkpoint and reload OM state
[ https://issues.apache.org/jira/browse/HDDS-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890405#comment-16890405 ]
Arpit Agarwal commented on HDDS-1649:
-------------------------------------
Merged via GitHub.
Thanks for the contribution [~hanishakoneru] and thanks for the code reviews [~bharatviswa]!
> 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: 13h 10m
> 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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