io.delta.standalone.actions

Class Protocol

Object

io.delta.standalone.actions.Protocol

All Implemented Interfaces:

Action

public final class Protocol
extends Object
implements Action

Used to block older clients from reading or writing the log when backwards incompatible changes are made to the protocol. Readers and writers are responsible for checking that they meet the minimum versions before performing any other operations.

Since this action allows us to explicitly block older clients in the case of a breaking change to the protocol, clients should be tolerant of messages and fields that they do not understand.

See Also:

Delta Transaction Log Protocol: Protocol Evolution

Constructor Summary

Constructors

Constructor and Description
Protocol(int minReaderVersion, int minWriterVersion)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
int	getMinReaderVersion()
int	getMinWriterVersion()
int	hashCode()

Methods inherited from class Object

getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Protocol

public Protocol(int minReaderVersion,
                int minWriterVersion)

Method Detail

getMinReaderVersion

public int getMinReaderVersion()

Returns:

the minimum version of the Delta read protocol that a client must implement in order to correctly read this table

getMinWriterVersion

public int getMinWriterVersion()

Returns:

the minimum version of the Delta write protocol that a client must implement in order to correctly write this table

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object