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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7096) Allow setting of end-of-record delimiter for TextInputFormat
Date Tue, 01 Feb 2011 22:19:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989411#comment-12989411

Todd Lipcon commented on HADOOP-7096:

A few style nits:
- after recordDelimiterBytes, need a blank line before the javadoc starts
- the comment on this line:
    } else { //recordDelimiterBytes != null, use default delimite
seems like it's backwards - don't you mean "== null" in the else clause? Also typo "delimite"
- Worth considering splitting readLine into two methods, one for the true case, one for the
false case
- Can you make recordDelimiterBytes final?
- In the MAX_VALUE case, for custom delimiter, the IOE should say "Too many bytes before delimiter",
rather than "before newline"

Although there aren't currently any unit tests to test LineReader in Common, it would be really
great if you had time to add a couple. Otherwise we can probably consider this as being tested
by the new unit inputformat tests in MAPREDUCE-2254.

> Allow setting of end-of-record delimiter for TextInputFormat
> ------------------------------------------------------------
>                 Key: HADOOP-7096
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7096
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Ahmed Radwan
>         Attachments: HADOOP-7096.patch, HADOOP-7096_r2.patch
> The patch for https://issues.apache.org/jira/browse/MAPREDUCE-2254 required minor changes
to the LineReader class to allow extensions (see attached 2.patch). Description copied below:
> It will be useful to allow setting the end-of-record delimiter for TextInputFormat. The
current implementation hardcodes '\n', '\r' or '\r\n' as the only possible record delimiters.
This is a problem if users have embedded newlines in their data fields (which is pretty common).
This is also a problem for other tools using this TextInputFormat (See for example: https://issues.apache.org/jira/browse/PIG-836
and https://issues.cloudera.org/browse/SQOOP-136).
> I have wrote a patch to address this issue. This patch allows users to specify any custom
end-of-record delimiter using a new added configuration property. For backward compatibility,
if this new configuration property is absent, then the same exact previous delimiters are
used (i.e., '\n', '\r' or '\r\n').

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