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From "Eric Yang (JIRA)" <>
Subject [jira] Commented: (CHUKWA-75) iostat output overflow
Date Wed, 01 Apr 2009 20:51:13 GMT


Eric Yang commented on CHUKWA-75:

The columns are mapped differently in different linux distro.  The parser doesn't employ a
strict type check, rather, it attempts to extract information by column separations.  Hence,
if the column is not a number, it must be a string, and we store the column as a string. 
This enable us to map columns by column header regardless how the column are rearranged.

Instead of 0, it is better to store as null.  Reopen to fix this again.

> iostat output overflow
> ----------------------
>                 Key: CHUKWA-75
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: Data Processors
>         Environment: Redhat 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: CHUKWA-75.patch
> On older systems, iostat metrics contain random overflow.  The plan is the put in a filter
to remove the overflow in the demux parser to improve the data quality.

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