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From "Eric Yang (JIRA)" <>
Subject [jira] Updated: (CHUKWA-75) iostat output overflow
Date Wed, 01 Apr 2009 23:35:13 GMT


Eric Yang updated CHUKWA-75:

    Attachment: CHUKWA-75-2.patch

Bump up the number to 1+e12, and skip the key/value pair, if it was a overflow.  In today's
disk, the highest throughput is ~100MB/second.  It's unlike any number should reach 1+e12
in iostat.  By skipping the key/value pair, we eliminate null pointer exception problem for
the down stream application.

> 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-75-2.patch, 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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