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Owen O'Malley commented on HADOOP-5834:
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I think we should completely redesign the format. I'd propose using JSON so
that it is trivial to parse in python, perl and java. If we only put in
newlines, between records all of the needs are met using a standard layout.
Furthermore, we can encode counters simply and directly rather than complicated
nested encoding schemes.
> Job History log file format is not friendly for external tools.
> ---------------------------------------------------------------
>
> Key: HADOOP-5834
> URL: https://issues.apache.org/jira/browse/HADOOP-5834
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Owen O'Malley
>
> Currently, parsing the job history logs with external tools is very difficult
> because of the format. The most critical problem is that newlines aren't
> escaped in the strings. That makes using tools like grep, sed, and awk very
> tricky.
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