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https://issues.apache.org/jira/browse/AVRO-1858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317337#comment-15317337
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Mike Hurley commented on AVRO-1858:
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I thought about int vs long. Since there's somebody else pointing that out,
it's probably a good idea to use a long.
When I added the head operation for my team, we talked about if we also wanted
tail. Our consensus was tail would be too expensive to implement (performance,
not code). Or, we just don't understand the Avro lib well enough. We just
wanted a feature to allow taking a quick peek into an Avro file.
I think the best option is to keep AVRO-1858 as it is. If you or others think
it's worthwhile, add tail and "substring" (or whatever better name for
pos+length dumps) JIRA items.
> Update DataFileReadTool (tojson) to support a "head" concept
> ------------------------------------------------------------
>
> Key: AVRO-1858
> URL: https://issues.apache.org/jira/browse/AVRO-1858
> Project: Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.8.1
> Reporter: Mike Hurley
>
> It would be nice if the tojson operator supported a "head" concept in order
> to get a sampling of records in an Avro file.
> Allow specifying a maximum record count to display. If no max is given in
> head mode, use a reasonable default (like 10).
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