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From Ariel Rabkin <>
Subject Re: Adaptor options for Hadoop log files (TaskTracker, DataNode)
Date Mon, 18 May 2009 01:19:04 GMT
It's worth distinguishing two different things.

The adaptor (as in CharFileTailingAdaptorUTF8) is responsible for
deciding how to break the data into chunks, and how to tag the chunks.
 Probably CharFileTailingAdaptorUTF8NewLineEscaped is right for you.
(We should really rename that to something shorter!)

The type, like SysLog or NameNodeLog, is stored by the adaptor, and
passed through as Chunk metadata. It's used to tell the Demux how to
process that data.  The demux-conf has the mapping from datatype to
processor.  For logs, you should be fine just picking a datatype.  If
you aren't using Demux to process the logs, you don't even need to
write a processor.


On Sun, May 17, 2009 at 6:15 PM, Jiaqi Tan <> wrote:
> Hi,
> Which adaptor should I use if I want to process log entries from the
> TaskTracker and DataNode logs? Should I just use one of the
> FileTailer adaptors already available (CharFileTailingAdaptorUTF8), or
> is there a custom type such as the one for SysLog or NameNodeLog when
> using the CharFileTailingAdaptorUTF8NewLineEscaped adaptor?
> Is there any documentation available on what the "type" (e.g. SysLog
> or NameNodeLog) means and how to use it/how it works?
> Thanks,
> Jiaqi

Ari Rabkin
UC Berkeley Computer Science Department

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