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https://issues.apache.org/jira/browse/HADOOP-2285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley updated HADOOP-2285:
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Attachment: fast-line.patch
Ok, here is a patch that does:
1. Avoids encoding the data as a string and stores it directly in the Text
object, which avoids the encode/decode cycle.
2. Merges the buffer and the readLine code, so that it can use direct buffer
access.
3. Adds a new method to Text to append bytes.
4. Adds a new method to Text to clear back to an empty string.
5. Adds test cases for the new functionality.
Using the benchmark on HADOOP-2406, I see a 3x speed up using TextInputFormat.
(32 seconds down to 11). This should be a big win for any jobs that scan a lot
of text data.
> TextInputFormat is slow compared to reading files.
> --------------------------------------------------
>
> Key: HADOOP-2285
> URL: https://issues.apache.org/jira/browse/HADOOP-2285
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.15.0
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.16.0
>
> Attachments: fast-line.patch
>
>
> The LineRecordReader reads from the source byte by byte, which seems to be
> half as fast as if the readLine method was defined on the memory buffer
> directly instead of as an InputStream.
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