Package org.apache.cassandra.index.sai.disk.v1.bitpack

Class MonotonicBlockPackedWriter

java.lang.Object

org.apache.cassandra.index.sai.disk.v1.bitpack.AbstractBlockPackedWriter

org.apache.cassandra.index.sai.disk.v1.bitpack.MonotonicBlockPackedWriter

public class MonotonicBlockPackedWriter
extends AbstractBlockPackedWriter

A writer for large monotonically increasing sequences of positive longs. The writer is optimised for monotonic sequences and stores values as a series of deltas from an expected value. The expected value is calculated from the minimum value in the block and the average delta for the block. This means that stored values are generally smaller and can be packed into a smaller number of bits, allowing for larger block sizes. Modified copy of MonotonicBlockPackedWriter to use DirectWriter for optimised reads that doesn't require seeking through the whole file to open a thread-exclusive reader.

Field Summary

Fields inherited from class org.apache.cassandra.index.sai.disk.v1.bitpack.AbstractBlockPackedWriter

blockIndex, blockMetaWriter, blockValues, finished, indexOutput

Constructor Summary

Constructors

Constructor	Description
MonotonicBlockPackedWriter(org.apache.lucene.store.IndexOutput out, int blockSize)

Method Summary

Modifier and Type	Method	Description
void	add(long l)	Append a new long.
protected void	flushBlock()

Methods inherited from class org.apache.cassandra.index.sai.disk.v1.bitpack.AbstractBlockPackedWriter

finish

Methods inherited from class java.lang.Object

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

Constructor Details

MonotonicBlockPackedWriter

public MonotonicBlockPackedWriter(org.apache.lucene.store.IndexOutput out,
 int blockSize)

Method Details

add

public void add(long l)
         throws IOException

Description copied from class: AbstractBlockPackedWriter

Append a new long.

Overrides:

add in class AbstractBlockPackedWriter

Throws:

IOException

flushBlock

protected void flushBlock()
                   throws IOException

Specified by:

flushBlock in class AbstractBlockPackedWriter

Throws:

IOException