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From "Tom Beerbower (JIRA)" <>
Subject [jira] [Updated] (AMBARI-9918) Caching of JPA entities causes SECONDARY_NAMENODE component to be re-persisted after NN HA enabling
Date Wed, 04 Mar 2015 04:12:05 GMT


Tom Beerbower updated AMBARI-9918:
    Attachment: AMBARI-9918.patch

> Caching of JPA entities causes SECONDARY_NAMENODE component to be re-persisted after
NN HA enabling
> ---------------------------------------------------------------------------------------------------
>                 Key: AMBARI-9918
>                 URL:
>             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
> {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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