org.apache.cassandra.db.lifecycle

Class View

java.lang.Object

org.apache.cassandra.db.lifecycle.View

public class View
extends java.lang.Object

An immutable structure holding the current memtable, the memtables pending flush, the sstables for a column family, and the sstables that are active in compaction (a subset of the sstables). Modifications to instances are all performed via a Function produced by the static methods in this class. These are composed as necessary and provided to the Tracker.apply() methods, which atomically reject or accept and apply the changes to the View.

Field Summary

Fields

Modifier and Type	Field and Description
java.util.Set<SSTableReader>	compacting
java.util.List<Memtable>	flushingMemtables contains all memtables that are no longer referenced for writing and are queued for / in the process of being flushed.
SSTableIntervalTree	intervalTree
java.util.List<Memtable>	liveMemtables ordinarily a list of size 1, but when preparing to flush will contain both the memtable we will flush and the new replacement memtable, until all outstanding write operations on the old table complete.
java.util.Set<SSTableReader>	premature
java.util.Set<SSTableReader>	sstables
java.util.Map<SSTableReader,SSTableReader>	sstablesMap

Method Summary

Modifier and Type	Method and Description
java.lang.Iterable<Memtable>	getAllMemtables()
Memtable	getCurrentMemtable()
java.lang.Iterable<SSTableReader>	getUncompacting(java.lang.Iterable<SSTableReader> candidates)
com.google.common.collect.Sets.SetView<SSTableReader>	nonCompactingSStables()
java.util.List<SSTableReader>	sstablesInBounds(RowPosition left, RowPosition right) Returns the sstables that have any partition between left and right, when both bounds are taken inclusively.
static java.util.List<SSTableReader>	sstablesInBounds(RowPosition left, RowPosition right, SSTableIntervalTree intervalTree)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

liveMemtables

public final java.util.List<Memtable> liveMemtables

ordinarily a list of size 1, but when preparing to flush will contain both the memtable we will flush and the new replacement memtable, until all outstanding write operations on the old table complete. The last item in the list is always the "current" memtable.

flushingMemtables

public final java.util.List<Memtable> flushingMemtables

contains all memtables that are no longer referenced for writing and are queued for / in the process of being flushed. In chronologically ascending order.

compacting

public final java.util.Set<SSTableReader> compacting

sstables

public final java.util.Set<SSTableReader> sstables

premature

public final java.util.Set<SSTableReader> premature

sstablesMap

public final java.util.Map<SSTableReader,SSTableReader> sstablesMap

intervalTree

public final SSTableIntervalTree intervalTree

Method Detail

getCurrentMemtable

public Memtable getCurrentMemtable()

getAllMemtables

public java.lang.Iterable<Memtable> getAllMemtables()

Returns:

the active memtable and all the memtables that are pending flush.

nonCompactingSStables

public com.google.common.collect.Sets.SetView<SSTableReader> nonCompactingSStables()

getUncompacting

public java.lang.Iterable<SSTableReader> getUncompacting(java.lang.Iterable<SSTableReader> candidates)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

sstablesInBounds

public java.util.List<SSTableReader> sstablesInBounds(RowPosition left,
                                                      RowPosition right)

Returns the sstables that have any partition between left and right, when both bounds are taken inclusively. The interval formed by left and right shouldn't wrap.

sstablesInBounds

public static java.util.List<SSTableReader> sstablesInBounds(RowPosition left,
                                                             RowPosition right,
                                                             SSTableIntervalTree intervalTree)