org.apache.cassandra.io.util

Class MmappedSegmentedFile

java.lang.Object

org.apache.cassandra.utils.concurrent.SharedCloseableImpl

org.apache.cassandra.io.util.SegmentedFile

org.apache.cassandra.io.util.MmappedSegmentedFile

All Implemented Interfaces:

java.lang.AutoCloseable, SharedCloseable

public class MmappedSegmentedFile
extends SegmentedFile

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MmappedSegmentedFile.Builder Overrides the default behaviour to create segments of a maximum size.

Field Summary

Fields

Modifier and Type	Field and Description
static long	MAX_SEGMENT_SIZE

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

channel, length, onDiskLength

Constructor Summary

Constructors

Constructor and Description
MmappedSegmentedFile(ChannelProxy channel, long length, org.apache.cassandra.io.util.SegmentedFile.Segment[] segments)

Method Summary

Modifier and Type	Method and Description
long[]	copyReadableBounds() Retrieve the readable bounds if any so they can be cloned into other files such as when downsampling an index summary.
FileDataInput	getSegment(long position)
static boolean	maybeRepair(CFMetaData metadata, Descriptor descriptor, IndexSummary indexSummary, SegmentedFile.Builder ibuilder, SegmentedFile.Builder dbuilder)
MmappedSegmentedFile	sharedCopy()

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

createReader, createThrottledReader, dropPageCache, getBuilder, getCompressedBuilder, iterator, path, toString

Methods inherited from class org.apache.cassandra.utils.concurrent.SharedCloseableImpl

close, close, isCleanedUp

Methods inherited from class java.lang.Object

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

Field Detail

MAX_SEGMENT_SIZE

public static long MAX_SEGMENT_SIZE

Constructor Detail

MmappedSegmentedFile

public MmappedSegmentedFile(ChannelProxy channel,
                            long length,
                            org.apache.cassandra.io.util.SegmentedFile.Segment[] segments)

Method Detail

sharedCopy

public MmappedSegmentedFile sharedCopy()

Specified by:

sharedCopy in interface SharedCloseable

Specified by:

sharedCopy in class SegmentedFile

Returns:

a new instance of the object representing the same state and backed by the same underlying resources. Coordinates with the original (and other instances) when the underlying resource should be closed. Throws an exception if the shared resource has already been closed.

getSegment

public FileDataInput getSegment(long position)

Overrides:

getSegment in class SegmentedFile

Returns:

The segment containing the given position: must be closed after use.

copyReadableBounds

public long[] copyReadableBounds()

Description copied from class: SegmentedFile

Retrieve the readable bounds if any so they can be cloned into other files such as when downsampling an index summary. Readable bounds are in between record locations in a file that are good positions for mapping the file such that records don't cross mappings.

Overrides:

copyReadableBounds in class SegmentedFile

maybeRepair

public static boolean maybeRepair(CFMetaData metadata,
                                  Descriptor descriptor,
                                  IndexSummary indexSummary,
                                  SegmentedFile.Builder ibuilder,
                                  SegmentedFile.Builder dbuilder)