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Date: Mon, 1 Dec 2008 21:33:44 -0800 (PST)
From: "Sreekanth Ramakrishnan (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-4576) Modify pending tasks count in the UI
 to pending jobs count in the UI
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     [ https://issues.apache.org/jira/browse/HADOOP-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sreekanth Ramakrishnan updated HADOOP-4576:
-------------------------------------------

    Attachment: HADOOP-4576-2.patch

Attaching new patch, this patch does not iterate thro' job list to find count of waiting jobs,instead introduces a counter in the QueueInfo object in JobQueueManager to maintain a count of waiting jobs which is incremented and decremented (by JobInitializationPoller). This would mean that in [HADOOP-4445|https://issues.apache.org/jira/browse/HADOOP-4445] we just need to iterate thro' running jobs queue to find number of running tasks for that queue.

> Modify pending tasks count in the UI to pending jobs count in the UI
> --------------------------------------------------------------------
>
>                 Key: HADOOP-4576
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4576
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.19.0
>            Reporter: Hemanth Yamijala
>            Assignee: Sreekanth Ramakrishnan
>         Attachments: HADOOP-4576-1.patch, HADOOP-4576-2.patch
>
>
> The UI for capacity scheduler displays 'pending tasks' counts. However the capacity scheduler does not update these counts to be the actual values for optimization purposes, for e.g. to avoid walking all pending jobs on all heartbeats. Hence this information is not very accurate.
> Also, while 'running tasks' counts are useful to compare against capacities and limits, 'pending tasks' counts do not add too much user value. A better count to display would be the number of running and pending jobs.

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