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From "Sebastian Toader (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-19164) Add PK to hostcomponentdesiredstate Table To Support FK Relationships
Date Thu, 15 Dec 2016 08:56:58 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-19164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebastian Toader updated AMBARI-19164:
--------------------------------------
    Attachment: AMBARI-19164.v3.patch

> Add PK to hostcomponentdesiredstate Table To Support FK Relationships
> ---------------------------------------------------------------------
>
>                 Key: AMBARI-19164
>                 URL: https://issues.apache.org/jira/browse/AMBARI-19164
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>            Reporter: Sebastian Toader
>            Assignee: Sebastian Toader
>            Priority: Critical
>             Fix For: 2.5.0
>
>         Attachments: AMBARI-19164.v3.patch
>
>
> The  {{hostcomponentdesiredstate}} table currently uses a compound PK based off of the
cluster ID, service name, host id and component name.   There are several problems with this
approach:
> * Primary Keys should be data that's not part of the business logic of the system and
not subject to be changed potentially (as strings are).
> * Other tables referencing the {{hostcomponentdesiredstate}} table would now need knowledge
of cluster/service/component/host in order to make the correct FK association. This leads
to extra data being tracked as well as data duplication.
> * Some databases, such as SQL Server, have problems with the indexing of compound PKs
and may lead to deadlocks when querying and updating concurrently.
> This table needs to be changed so that it uses a simple PK for referencing. FK relationships
as they exist today can still be maintained as long as a {{UNIQUE}} constraint is placed on
the table. We should:
> * Add a {{UNIQUE}} constraint to the former PK columns
> * Add an {{INDEX}} to the former PK columns



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