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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3753) metrics: FileContext support overwrite mode
Date Mon, 14 Jul 2008 20:30:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Craig Macdonald updated HADOOP-3753:

    Attachment: HADOOP-3753.v1.patch

Initial patch for this issue. The metrics file is over-written every period.

> metrics: FileContext support overwrite mode
> -------------------------------------------
>                 Key: HADOOP-3753
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3753
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Craig Macdonald
>            Priority: Minor
>         Attachments: HADOOP-3753.v1.patch
> FileContext currently continually appends to the metrics log file(s), generating an ever
lengthening file.
> In some scenarios, it would be useful to simply write the current statistics to the file
once every period, then overwrite the file for the next period.
> For instance, this could be useful if an external application parsed the metrics output
- e.g. Cacti to create realtime graphs.

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