org.apache.flink.state.api

类 SavepointReader

java.lang.Object

org.apache.flink.state.api.SavepointReader

@PublicEvolving
public class SavepointReader
extends Object

The entry point for reading state from a Flink savepoint.

方法概要

限定符和类型	方法和说明
static SavepointReader	read(org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env, String path) Loads an existing savepoint.
static SavepointReader	read(org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env, String path, org.apache.flink.runtime.state.StateBackend stateBackend) Loads an existing savepoint.
<K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>>	readBroadcastState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo) Read operator BroadcastState from a Savepoint.
<K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>>	readBroadcastState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer) Read operator BroadcastState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.
<K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>>	readBroadcastState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo) 已过时。 use readBroadcastState(OperatorIdentifier, String, TypeInformation, TypeInformation)
<K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>>	readBroadcastState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer) 已过时。 use readBroadcastState(OperatorIdentifier, String, TypeInformation, TypeInformation, TypeSerializer, TypeSerializer)
<K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT>	readKeyedState(OperatorIdentifier identifier, KeyedStateReaderFunction<K,OUT> function) Read keyed state from an operator in a Savepoint.
<K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT>	readKeyedState(OperatorIdentifier identifier, KeyedStateReaderFunction<K,OUT> function, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo) Read keyed state from an operator in a Savepoint.
<K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT>	readKeyedState(String uid, KeyedStateReaderFunction<K,OUT> function) 已过时。 use readKeyedState(OperatorIdentifier, KeyedStateReaderFunction)
<K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT>	readKeyedState(String uid, KeyedStateReaderFunction<K,OUT> function, org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo) 已过时。 use readKeyedState(OperatorIdentifier, KeyedStateReaderFunction, TypeInformation, TypeInformation)
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readListState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo) Read operator ListState from a Savepoint.
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readListState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer) Read operator ListState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readListState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo) 已过时。 use readListState(OperatorIdentifier, String, TypeInformation)
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readListState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer) 已过时。 use readListState(OperatorIdentifier, String, TypeInformation, TypeSerializer)
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readUnionState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo) Read operator UnionState from a Savepoint.
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readUnionState(OperatorIdentifier identifier, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer) Read operator UnionState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readUnionState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo) 已过时。 use readUnionState(OperatorIdentifier, String, TypeInformation)
<T> org.apache.flink.streaming.api.datastream.DataStream<T>	readUnionState(String uid, String name, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer) 已过时。 use readUnionState(OperatorIdentifier, String, TypeInformation, TypeSerializer)
<W extends org.apache.flink.streaming.api.windowing.windows.Window> WindowSavepointReader<W>	window(org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer) Read window state from an operator in a Savepoint.
<W extends org.apache.flink.streaming.api.windowing.windows.Window> WindowSavepointReader<W>	window(org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<?,W> assigner) Read window state from an operator in a Savepoint.

从类继承的方法 java.lang.Object

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

方法详细资料

read

public static SavepointReader read(org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env,
                                   String path)
                            throws IOException

Loads an existing savepoint. Useful if you want to query the state of an existing application. The savepoint will be read using the state backend defined via the clusters configuration.

参数:

env - The execution environment used to transform the savepoint.

path - The path to an existing savepoint on disk.

返回:

A SavepointReader.

抛出:

IOException

read

public static SavepointReader read(org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env,
                                   String path,
                                   org.apache.flink.runtime.state.StateBackend stateBackend)
                            throws IOException

Loads an existing savepoint. Useful if you want to query the state of an existing application.

参数:

env - The execution environment used to transform the savepoint.

path - The path to an existing savepoint on disk.

stateBackend - The state backend of the savepoint.

返回:

A SavepointReader.

抛出:

IOException

readListState

@Deprecated
public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readListState(String uid,
                                                                                             String name,
                                                                                             org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo)
                                                                                      throws IOException

已过时。 use readListState(OperatorIdentifier, String, TypeInformation)

抛出:

IOException

readListState

public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readListState(OperatorIdentifier identifier,
                                                                                 String name,
                                                                                 org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo)
                                                                          throws IOException

Read operator ListState from a Savepoint.

类型参数:

T - The type of the values that are in the list state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

typeInfo - The type of the elements in the state.

返回:

A DataStream representing the elements in state.

抛出:

IOException - If the savepoint path is invalid or the uid does not exist.

readListState

@Deprecated
public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readListState(String uid,
                                                                                             String name,
                                                                                             org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                                                                                             org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)
                                                                                      throws IOException

已过时。 use readListState(OperatorIdentifier, String, TypeInformation, TypeSerializer)

抛出:

IOException

readListState

public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readListState(OperatorIdentifier identifier,
                                                                                 String name,
                                                                                 org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                                                                                 org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)
                                                                          throws IOException

Read operator ListState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.

类型参数:

T - The type of the values that are in the list state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

typeInfo - The type of the elements in the state.

serializer - The serializer used to write the elements into state.

返回:

A DataStream representing the elements in state.

抛出:

IOException - If the savepoint path is invalid or the uid does not exist.

readUnionState

@Deprecated
public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readUnionState(String uid,
                                                                                              String name,
                                                                                              org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo)
                                                                                       throws IOException

已过时。 use readUnionState(OperatorIdentifier, String, TypeInformation)

抛出:

IOException

readUnionState

public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readUnionState(OperatorIdentifier identifier,
                                                                                  String name,
                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo)
                                                                           throws IOException

Read operator UnionState from a Savepoint.

类型参数:

T - The type of the values that are in the union state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

typeInfo - The type of the elements in the state.

返回:

A DataStream representing the elements in state.

抛出:

IOException - If the savepoint path is invalid or the uid does not exist.

readUnionState

public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readUnionState(String uid,
                                                                                  String name,
                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                                                                                  org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)
                                                                           throws IOException

已过时。 use readUnionState(OperatorIdentifier, String, TypeInformation, TypeSerializer)

抛出:

IOException

readUnionState

public <T> org.apache.flink.streaming.api.datastream.DataStream<T> readUnionState(OperatorIdentifier identifier,
                                                                                  String name,
                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                                                                                  org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)
                                                                           throws IOException

Read operator UnionState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.

类型参数:

T - The type of the values that are in the union state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

typeInfo - The type of the elements in the state.

serializer - The serializer used to write the elements into state.

返回:

A DataStream representing the elements in state.

抛出:

IOException - If the savepoint path is invalid or the uid does not exist.

readBroadcastState

@Deprecated
public <K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>> readBroadcastState(String uid,
                                                                                                                                              String name,
                                                                                                                                              org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                                                                              org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo)
                                                                                                                                       throws IOException

已过时。 use readBroadcastState(OperatorIdentifier, String, TypeInformation, TypeInformation)

抛出:

IOException

readBroadcastState

public <K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>> readBroadcastState(OperatorIdentifier identifier,
                                                                                                                                  String name,
                                                                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo)
                                                                                                                           throws IOException

Read operator BroadcastState from a Savepoint.

类型参数:

K - The type of keys in state.

V - The type of values in state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

keyTypeInfo - The type information for the keys in the state.

valueTypeInfo - The type information for the values in the state.

返回:

A DataStream of key-value pairs from state.

抛出:

IOException - If the savepoint does not contain the specified uid.

readBroadcastState

@Deprecated
public <K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>> readBroadcastState(String uid,
                                                                                                                                              String name,
                                                                                                                                              org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                                                                              org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo,
                                                                                                                                              org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                                                                                                                              org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer)
                                                                                                                                       throws IOException

已过时。 use readBroadcastState(OperatorIdentifier, String, TypeInformation, TypeInformation, TypeSerializer, TypeSerializer)

抛出:

IOException

readBroadcastState

public <K,V> org.apache.flink.streaming.api.datastream.DataStream<org.apache.flink.api.java.tuple.Tuple2<K,V>> readBroadcastState(OperatorIdentifier identifier,
                                                                                                                                  String name,
                                                                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                                                                  org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo,
                                                                                                                                  org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                                                                                                                  org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer)
                                                                                                                           throws IOException

Read operator BroadcastState from a Savepoint when a custom serializer was used; e.g., a different serializer than the one returned by TypeInformation#createSerializer.

类型参数:

K - The type of keys in state.

V - The type of values in state.

参数:

identifier - The identifier of the operator.

name - The (unique) name for the state.

keyTypeInfo - The type information for the keys in the state.

valueTypeInfo - The type information for the values in the state.

keySerializer - The type serializer used to write keys into the state.

valueSerializer - The type serializer used to write values into the state.

返回:

A DataStream of key-value pairs from state.

抛出:

IOException - If the savepoint path is invalid or the uid does not exist.

readKeyedState

@Deprecated
public <K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT> readKeyedState(String uid,
                                                                                                    KeyedStateReaderFunction<K,OUT> function)
                                                                                             throws IOException

已过时。 use readKeyedState(OperatorIdentifier, KeyedStateReaderFunction)

抛出:

IOException

readKeyedState

public <K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT> readKeyedState(OperatorIdentifier identifier,
                                                                                        KeyedStateReaderFunction<K,OUT> function)
                                                                                 throws IOException

Read keyed state from an operator in a Savepoint.

类型参数:

K - The type of the key in state.

OUT - The output type of the transform function.

参数:

identifier - The identifier of the operator.

function - The KeyedStateReaderFunction that is called for each key in state.

返回:

A DataStream of objects read from keyed state.

抛出:

IOException - If the savepoint does not contain operator state with the given uid.

readKeyedState

@Deprecated
public <K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT> readKeyedState(String uid,
                                                                                                    KeyedStateReaderFunction<K,OUT> function,
                                                                                                    org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                                    org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo)
                                                                                             throws IOException

已过时。 use readKeyedState(OperatorIdentifier, KeyedStateReaderFunction, TypeInformation, TypeInformation)

抛出:

IOException

readKeyedState

public <K,OUT> org.apache.flink.streaming.api.datastream.DataStream<OUT> readKeyedState(OperatorIdentifier identifier,
                                                                                        KeyedStateReaderFunction<K,OUT> function,
                                                                                        org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                                                        org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo)
                                                                                 throws IOException

Read keyed state from an operator in a Savepoint.

类型参数:

K - The type of the key in state.

OUT - The output type of the transform function.

参数:

identifier - The identifier of the operator.

function - The KeyedStateReaderFunction that is called for each key in state.

keyTypeInfo - The type information of the key in state.

outTypeInfo - The type information of the output of the transform reader function.

返回:

A DataStream of objects read from keyed state.

抛出:

IOException - If the savepoint does not contain operator state with the given uid.

window

public <W extends org.apache.flink.streaming.api.windowing.windows.Window> WindowSavepointReader<W> window(org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<?,W> assigner)

Read window state from an operator in a Savepoint. This method supports reading from any type of window.

参数:

assigner - The WindowAssigner used to write out the operator.

返回:

A WindowSavepointReader.

window

public <W extends org.apache.flink.streaming.api.windowing.windows.Window> WindowSavepointReader<W> window(org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer)

Read window state from an operator in a Savepoint. This method supports reading from any type of window.

参数:

windowSerializer - The serializer used for the window type.

返回:

A WindowSavepointReader.