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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3937) Job history may get disabled due to overly long job names
Date Wed, 13 Aug 2008 15:24:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622248#action_12622248
] 

Amar Kamat commented on HADOOP-3937:
------------------------------------

The current strategy for naming a history file is as follows
_job-history-start-time___job-id___job-name___user-name_. 
The reason for using this technique is to make sure that the job history filename remains
unique across jobtrackers and across restarts. Making it 50 characters might cause the filenames
to clash. We should probably come up with a strategy of giving shorter unique filenames to
the job history. Thoughts?

> Job history may get disabled due to overly long job names
> ---------------------------------------------------------
>
>                 Key: HADOOP-3937
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3937
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.17.0, 0.17.1, 0.18.0, 0.19.0
>            Reporter: Matei Zaharia
>         Attachments: HADOOP-3937.patch
>
>
> Since Hadoop 0.17, the job history logs include the job's name in the filename. However,
this can lead to overly long filenames, because job names may be arbitrarily long. When a
filename is too long for the underlying OS, file creation fails and the JobHistory class silently
disables history from that point on. This can lead to days of lost history until somebody
notices the error in the log.
> Proposed solution: Trim the job name to a reasonable length when selecting a filename
for the history file.

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