[jira] [Updated] (AMBARI-10050) Querying For Requests By Task Status Has Poor Performance

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMBARI-10050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Hurley updated AMBARI-10050:
-------------------------------------
    Attachment: AMBARI-10050.patch

> Querying For Requests By Task Status Has Poor Performance
> ---------------------------------------------------------
>
>                 Key: AMBARI-10050
>                 URL: https://issues.apache.org/jira/browse/AMBARI-10050
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.0.0
>            Reporter: Jonathan Hurley
>            Assignee: Jonathan Hurley
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: AMBARI-10050.patch
>
>
> When querying for the requests that are either IN_PROGRESS, FAILED or COMPLETED, the query being used is inefficient and can cause a wait of up to 10 minutes in a cluster where there is a large number of stages and tasks.
> {{HostRoleCommandDAO.getRequestsByTaskStatus(...)}}
> This SQL seems overly complex for what it is. Removing the nested SELECT seems like a great way to reduce the query time:
> {code}
> SELECT DISTINCT task.request_id as request_id
>   FROM host_role_command task WHERE task.status IN ( 'COMPLETED', 'FAILED', 'TIMEDOUT', 'ABORTED')
>   ORDER BY task.request_id ASC;
> {code}
> ... or if we want to keep the NOT IN
> {code}
> SELECT DISTINCT task.request_id as task_id
>   FROM host_role_command task WHERE task.status NOT IN ( 'QUEUED', 'IN_PROGRESS', 
>                                               'PENDING', 'HOLDING', 
>                                               'HOLDING_FAILED', 
>                                               'HOLDING_TIMEOUT' )
>   ORDER BY task.request_id ASC
>   LIMIT 1000
> {code}
> But to be honest, my suggestion is to rewrite this as a simple query that matches from an {{EnumSet}} found in {{HostRoleStatus}}.
> Essentially, the problem here is that {{getRequestsByStatus}} is trying to do the calculation work to determine the request status from task status all in SQL. This method should be broken out into 2 SQL queries:
> - My above query for IN_PROGRESS or FAILED requests
> - A new query for COMPLETED that looks for any requests where all tasks have completed.



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