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https://issues.apache.org/jira/browse/HADOOP-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476239
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Doug Cutting commented on HADOOP-928:
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One more thing: the sum file buffer should also be kept small, probably to the
default (io.file.buffer.size). Currently the patch passes the bufferSize
parameter there, rather than letting it default.
> make checksums optional per FileSystem
> --------------------------------------
>
> Key: HADOOP-928
> URL: https://issues.apache.org/jira/browse/HADOOP-928
> Project: Hadoop
> Issue Type: Improvement
> Components: fs
> Reporter: Doug Cutting
> Assigned To: Hairong Kuang
> Attachments: checksum.patch, checksum1.patch, checksum2.patch
>
>
> Checksumming is currently built into the base FileSystem class. It should
> instead be optional, with each FileSystem implementation electing whether to
> use the Hadoop-provided checksum system, or to disable it, or to implement
> its own custom checksum system.
> To implement this, a ChecksumFileSystem implementation can be provided that
> wraps another FileSystem implementation, implementing checksums as in
> Hadoop's current mandatory implementation (i.e., as a separate crc file per
> file that's elided from directory listings). The 'raw' FileSystem methods
> would be removed. FSDataInputStream and FSDataOutputStream would be made
> interfaces.
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