Package org.apache.cassandra.db.streaming

Class CompressedInputStream

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.DataInputPlus.DataInputStreamPlus

org.apache.cassandra.io.util.RebufferingInputStream

org.apache.cassandra.db.streaming.CompressedInputStream

All Implemented Interfaces:

Closeable, DataInput, AutoCloseable, DataInputPlus

public class CompressedInputStream
extends RebufferingInputStream
implements AutoCloseable

InputStream which reads compressed chunks from the underlying input stream and deals with decompression and position tracking. The underlying input will be an instance of RebufferingInputStream except in some unit tests. Compressed chunks transferred will be a subset of all chunks in the source streamed sstable - just enough to deserialize the requested partition position ranges. Correctness of the entire operation depends on provided partition position ranges and compressed chunks properly matching, and there is no way on the receiving side to verify if that's the case, which arguably makes this a little brittle.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.DataInputPlus

DataInputPlus.DataInputStreamPlus

Field Summary

Fields inherited from class org.apache.cassandra.io.util.RebufferingInputStream

buffer

Constructor Summary

Constructors

Constructor	Description
CompressedInputStream(DataInputPlus input, CompressionInfo compressionInfo, ChecksumType checksumType, DoubleSupplier validateChecksumChance)

Method Summary

Modifier and Type	Method	Description
void	close()
void	position(long position)	Invoked when crossing into the next SSTableReader.PartitionPositionBounds section in CassandraCompressedStreamReader.read(DataInputPlus).
protected void	reBuffer()	Implementations must implement this method to refill the buffer.

Methods inherited from class org.apache.cassandra.io.util.RebufferingInputStream

read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readFully, readInt, readLine, readLong, readPrimitiveSlowly, readShort, readUnsignedByte, readUnsignedShort, readUnsignedVInt, readUnsignedVInt32, readUTF, readVInt, readVInt32, skipBytes

Methods inherited from class java.io.InputStream

available, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.cassandra.io.util.DataInputPlus

skipBytesFully

Constructor Details

CompressedInputStream

public CompressedInputStream(DataInputPlus input,
 CompressionInfo compressionInfo,
 ChecksumType checksumType,
 DoubleSupplier validateChecksumChance)

Parameters:

input - Input input to read compressed data from

compressionInfo - Compression info

Method Details

position

public void position(long position)
              throws IOException

Invoked when crossing into the next SSTableReader.PartitionPositionBounds section in CassandraCompressedStreamReader.read(DataInputPlus). Will skip 1..n compressed chunks of the original sstable.

Throws:

IOException

reBuffer

protected void reBuffer()
                 throws IOException

Description copied from class: RebufferingInputStream

Implementations must implement this method to refill the buffer. They can expect the buffer to be empty when this method is invoked.

Specified by:

reBuffer in class RebufferingInputStream

Throws:

IOException

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream