org.apache.cassandra.db.rows

Class Row.Deletion

java.lang.Object

org.apache.cassandra.db.rows.Row.Deletion

Enclosing interface:

Row

public static class Row.Deletion
extends java.lang.Object

A row deletion/tombstone.

A row deletion mostly consists of the time of said deletion, but there is 2 variants: shadowable and regular row deletion.

A shadowable row deletion only exists if the row has no timestamp. In other words, the deletion is only valid as long as no newer insert is done (thus setting a row timestap; note that if the row timestamp set is lower than the deletion, it is shadowed (and thus ignored) as usual).

That is, if a row has a shadowable deletion with timestamp A and an update is madeto that row with a timestamp B such that B > A (and that update sets the row timestamp), then the shadowable deletion is 'shadowed' by that update. A concrete consequence is that if said update has cells with timestamp lower than A, then those cells are preserved(since the deletion is removed), and this contrarily to a normal (regular) deletion where the deletion is preserved and such cells are removed.

Currently, the only use of shadowable row deletions is Materialized Views, see CASSANDRA-10261.

Field Summary

Fields

Modifier and Type	Field and Description
static Row.Deletion	LIVE

Constructor Summary

Constructors

Constructor and Description
Deletion(DeletionTime time, boolean isShadowable)

Method Summary

Modifier and Type	Method and Description
int	dataSize()
boolean	deletes(Cell cell)
boolean	deletes(LivenessInfo info)
void	digest(java.security.MessageDigest digest)
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	isLive() Wether the deletion is live or not, that is if its an actual deletion or not.
boolean	isShadowable() Whether the deletion is a shadowable one or not.
boolean	isShadowedBy(LivenessInfo primaryKeyLivenessInfo)
static Row.Deletion	regular(DeletionTime time)
static Row.Deletion	shadowable(DeletionTime time)
boolean	supersedes(DeletionTime that)
boolean	supersedes(Row.Deletion that)
DeletionTime	time() The time of the row deletion.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

LIVE

public static final Row.Deletion LIVE

Constructor Detail

Deletion

public Deletion(DeletionTime time,
                boolean isShadowable)

Method Detail

regular

public static Row.Deletion regular(DeletionTime time)

shadowable

public static Row.Deletion shadowable(DeletionTime time)

time

public DeletionTime time()

The time of the row deletion.

Returns:

the time of the row deletion.

isShadowable

public boolean isShadowable()

Whether the deletion is a shadowable one or not.

Returns:

whether the deletion is a shadowable one. Note that if isLive(), then this is guarantee to return false.

isLive

public boolean isLive()

Wether the deletion is live or not, that is if its an actual deletion or not.

Returns:

true if this represents no deletion of the row, false if that's an actual deletion.

supersedes

public boolean supersedes(DeletionTime that)

supersedes

public boolean supersedes(Row.Deletion that)

isShadowedBy

public boolean isShadowedBy(LivenessInfo primaryKeyLivenessInfo)

deletes

public boolean deletes(LivenessInfo info)

deletes

public boolean deletes(Cell cell)

digest

public void digest(java.security.MessageDigest digest)

dataSize

public int dataSize()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object