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https://issues.apache.org/jira/browse/HDDS-4315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hanisha Koneru updated HDDS-4315:
---------------------------------
Summary: Ensure ObjectIDs are unique across restarts (was: Use Epoch to
generate unique ObjectIDs)
> Ensure ObjectIDs are unique across restarts
> -------------------------------------------
>
> Key: HDDS-4315
> URL: https://issues.apache.org/jira/browse/HDDS-4315
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Hanisha Koneru
> Assignee: Hanisha Koneru
> Priority: Major
> Labels: pull-request-available
>
> In a non-Ratis OM, the transaction index used to generate ObjectID is reset
> on OM restart. This can lead to duplicate ObjectIDs when the OM is restarted.
> ObjectIDs should be unique.
> For HDDS-2939 and NFS are some of the features which depend on ObjectIds
> being unique.
> This Jira aims to introduce an epoch number in OM which is incremented on OM
> restarts. The epoch is persisted on disk. This epoch will be used to set the
> first 16 bits of the objectID to ensure that objectIDs are unique even after
> OM restart.
> The highest epoch number is reserved for transactions coming through ratis.
> This will take care of the scenario where OM ratis is enabled on an existing
> cluster.
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