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https://issues.apache.org/jira/browse/HADOOP-2165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628627#action_12628627
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Vinod K V commented on HADOOP-2165:
-----------------------------------
Also, as discussed with Hemanth, we make HTTP HEAD requests on the
taskdetailshistory.jsp page which corresponds to the information of all tasks
related to one single TaskInProgress. So the number of HEAD requests per jsp
access *is* _capped_ by the total number of task-attempts of a single
TaskInProgress, i.e., mapred.(map|reduce).max.attempts + one speculative
attempt. Even within this limit, for faster response, we can start parallel
HEAD requests.
> Augment JobHistory to store tasks' userlogs
> -------------------------------------------
>
> Key: HADOOP-2165
> URL: https://issues.apache.org/jira/browse/HADOOP-2165
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Arun C Murthy
> Assignee: Vinod K V
> Attachments: patch_userlog_1.4.3.txt
>
>
> It will be very useful to be able to see the job's userlogs (the
> stdout/stderr/syslog of the tasks) from the JobHistory page. It will greatly
> aid in debugging etc.
> At the very minimum we should have links from the JobHistory to the logs on
> the TT.
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