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https://issues.apache.org/jira/browse/HADOOP-928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-928:
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Attachment: checksum1.patch
This patch incorporates most of Doug's comments.
I finally decided to keep the FSInputStream interface, the raw file system
input stream. The reason is that every filesystem needs to implement the raw
stream interface in order to provide a data input stream, i.e.
FSDataInputStream. Currently the default implementation of FSDataInputStream is
a wrapper over the raw stream, providing a buffered, seekable, and position
readable data stream.
> 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
>
>
> 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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