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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3930) Decide how to integrate scheduler info into CLI and job tracker web page
Date Thu, 21 Aug 2008 05:30:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624262#action_12624262
] 

Hemanth Yamijala commented on HADOOP-3930:
------------------------------------------

Regarding where the scheduler information should be - there are two types of scheduler information:
- Job specific - which should be with the jobs
- System wide - which can be either with the jobs or on a different page, as Dhruba points.
I am fine with either, but I am leaning more towards having it on the jobs page because:
-- Then all scheduler information is on one page
-- As Dhruba agrees, power users might still want to see scheduling information.

Also, as we are discussing in HADOOP-3698, it may be that queues being acknowledged as part
of the mapred system, might not be in the scheduler API. I think we should wait for a consensus
on that before moving forward on this issue.



> Decide how to integrate scheduler info into CLI and job tracker web page
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-3930
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3930
>             Project: Hadoop Core
>          Issue Type: Improvement
>    Affects Versions: 0.17.2
>            Reporter: Matei Zaharia
>            Priority: Minor
>         Attachments: 3930-1.patch, mockup.JPG
>
>
> We need a way for job schedulers such as HADOOP-3445 and HADOOP-3476 to provide info
to display on the JobTracker web interface and in the CLI. The main things needed seem to
be:
> * A way for schedulers to provide info to show in a column on the web UI and in the CLI
- something as simple as a single string, or a map<string, int> for multiple parameters.
> * Some sorting order for jobs - maybe a method to sort a list of jobs.
> Let's figure out what the best way to do this is and implement it in the existing schedulers.
> My first-order proposal at an API: Augment the TaskScheduler with
> * public Map<String, String> getSchedulingInfo(JobInProgress job) -- returns key-value
pairs which are displayed in columns on the web UI or the CLI for the list of jobs.
> * public Map<String, String> getSchedulingInfo(String queue) -- returns key-value
pairs which are displayed in columns on the web UI or the CLI for the list of queues.
> * public Collection<JobInProgress> getJobs(String queueName) -- returns the list
of jobs in a given queue, sorted by a scheduler-specific order (the order it wants to run
them in / schedule the next task in / etc).
> * public List<String> getQueues();

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