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https://issues.apache.org/jira/browse/HADOOP-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12503531
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Raghu Angadi commented on HADOOP-1450:
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Also note that this patch adds one more buffering to input and output streams.
Do we really need the small buffer close to the user?
> checksums should be closer to data generation and consumption
> -------------------------------------------------------------
>
> Key: HADOOP-1450
> URL: https://issues.apache.org/jira/browse/HADOOP-1450
> Project: Hadoop
> Issue Type: Improvement
> Components: fs
> Reporter: Doug Cutting
> Fix For: 0.14.0
>
> Attachments: HADOOP-1450.patch
>
>
> ChecksumFileSystem checksums data by inserting a filter between two buffers.
> The outermost buffer should be as small as possible, so that, when writing,
> checksums are computed before the data has spent much time in memory, and,
> when reading, checksums are validated as close to their time of use as
> possible. Currently the outer buffer is the larger, using the bufferSize
> specified by the user, and the inner is small, so that most reads and writes
> will bypass it, as an optimization. Instead, the outer buffer should be made
> to be bytesPerChecksum, and the inner buffer should be the user-specified
> buffer size.
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