Hairong Kuang commented on HADOOP-928:
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How about the following proposal to remove FSInputStream?
1. Replace current FSInputStream with FSDataInputStream.
* FSDataInputStream extends DataInputStream and implemets Seekable and PositionedReadable.
* Every file system including ChecksumedFileSystem provides its own specific implementation of FSDataInputStream.
* Open returns a FSDataInputStream.
2. Replace current FSDataInputStream with BufferedFSDataInputStream.
* BufferedFSDataInputStream extends FSDataInputStream, providing a buffered and position cached implementation of FSDataInputStream.
* Open(file, buffersize) returns a BufferedFSDataInputStream.
make checksums optional per FileSystem
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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
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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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
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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