[jira] Commented: (HADOOP-928) make checksums optional per FileSystem

["Hairong Kuang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468417 ] 

Hairong Kuang commented on HADOOP-928:
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> The 'raw' FileSystem methods would be removed.

It's hard to for me to see how to remove createRaw and openRaw from FileSystem. The method "create" returns a buffered, position-cached, and/or checksummed stream, i.e., FSDataOutputStream, while the method "createRaw" returns a raw I/O stream, i.e. FSOutputStream. They seem to serve different purposes no matter the file system is checksummed or not.

> 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
>
> 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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