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https://issues.apache.org/jira/browse/AMBARI-9918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom Beerbower updated AMBARI-9918:
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Attachment: AMBARI-9918.patch
> Caching of JPA entities causes SECONDARY_NAMENODE component to be
> re-persisted after NN HA enabling
> ---------------------------------------------------------------------------------------------------
>
> Key: AMBARI-9918
> URL: https://issues.apache.org/jira/browse/AMBARI-9918
> Project: Ambari
> Issue Type: Bug
> Reporter: Tom Beerbower
> Assignee: Tom Beerbower
> Fix For: 2.0.0
>
> Attachments: AMBARI-9918.patch
>
>
> There is a problem in that the JPA component state entities are cached as
> part of the ServiceComponentHostImpl.
> {code}
> private HostComponentStateEntity stateEntity;
> private HostComponentDesiredStateEntity desiredStateEntity;
> {code}
> Also in HostImpl ...
> {code}
> private HostEntity hostEntity;
> private HostStateEntity hostStateEntity;
> {code}
> The cached entities can be come detached and stale.
> # The JOURNALNODE component is added and a component state entity is created
> and persisted for it. Each state entity is associated with a host entity
> which is associated with all of its components (including SECONDARY_NAMENODE,
> in this case). After persisting, the entity becomes detached.
> # The SECONDARY_NAMENODE component is removed. The component state row is
> removed from the database via JPA. The associated host entity is updated to
> remove the deleted component state entity reference.
> # The JOURNALNODE component state entity refers to a different (detached)
> host entity instance so it still refers back to the deleted component state
> entity reference for the SECONDARY_NAMENODE.
> # The heartbeat handler is called which updates the state of the components.
> When it gets to the JOURNALNODE, the associated stale host entity is
> persisted along with the now deleted SECONDARY_NAMENODE component state
> entity. In other words, the entity manager sees the difference and thinks
> that the deleted component is being added back. The row is added back to the
> database.
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