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Yuki Morishita commented on CASSANDRA-4297:
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CompressedDIS is DataInputStream version of CompressedRandomAccessReader. It
reads compressed chunks directly from stream and provides decompressed data
while reading from stream. CRC check is also performed after decompressing
chunk based on crc_chance setting in compression option, which is default to
1.0 or 100%, as done in CRAR.
> Use java NIO as much as possible when streaming compressed SSTables
> -------------------------------------------------------------------
>
> Key: CASSANDRA-4297
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4297
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Yuki Morishita
> Assignee: Yuki Morishita
> Priority: Minor
> Labels: streaming
> Fix For: 1.2
>
>
> Back in 0.8, streaming uses java NIO (FileChannel#transferTo/transferFrom) to
> perform zero copy file transfer between nodes. Since 1.0, in order to add new
> features like sstable compression and internode encryption we had to switch
> to java IO Input/OutputStreams. What we currently do to transfer compressed
> SSTable is, in source node, 1) decompress chunk in SSTable, 2) compress using
> LZF for network, and in destination node, 3) decompress using LZF as reading
> from socket, 4) compress for SSTable on disk.
> Now, 1.1 comes out with SSTable compression turned on by default. It is
> reasonable to transfer compressed file as is using NIO instead of
> decompress/compress in source node.
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