checksums should be closer to data generation and consumption
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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
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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