org.apache.flink.runtime.state.metainfo.StateMetaInfoReader Java Examples
The following examples show how to use
org.apache.flink.runtime.state.metainfo.StateMetaInfoReader.
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Example #1
Source File: SerializationProxiesTest.java From Flink-CEPplus with Apache License 2.0 | 6 votes |
@Test public void testKeyedStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> namespaceSerializer = LongSerializer.INSTANCE; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot metaInfo = new RegisteredKeyValueStateBackendMetaInfo<>( StateDescriptor.Type.VALUE, name, namespaceSerializer, stateSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(metaInfo, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); metaInfo = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } Assert.assertEquals(name, metaInfo.getName()); }
Example #2
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 6 votes |
@Test public void testKeyedStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> namespaceSerializer = LongSerializer.INSTANCE; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot metaInfo = new RegisteredKeyValueStateBackendMetaInfo<>( StateDescriptor.Type.VALUE, name, namespaceSerializer, stateSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(metaInfo, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); metaInfo = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } Assert.assertEquals(name, metaInfo.getName()); }
Example #3
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 6 votes |
@Test public void testKeyedStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> namespaceSerializer = LongSerializer.INSTANCE; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot metaInfo = new RegisteredKeyValueStateBackendMetaInfo<>( StateDescriptor.Type.VALUE, name, namespaceSerializer, stateSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(metaInfo, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); metaInfo = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } Assert.assertEquals(name, metaInfo.getName()); }
Example #4
Source File: OperatorBackendSerializationProxy.java From Flink-CEPplus with Apache License 2.0 | 5 votes |
@Override public void read(DataInputView in) throws IOException { super.read(in); final int proxyReadVersion = getReadVersion(); final Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(proxyReadVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for operator backend serialization readVersion=" + proxyReadVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); int numOperatorStates = in.readShort(); operatorStateMetaInfoSnapshots = new ArrayList<>(numOperatorStates); for (int i = 0; i < numOperatorStates; i++) { operatorStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } if (proxyReadVersion >= 3) { // broadcast states did not exist prior to version 3 int numBroadcastStates = in.readShort(); broadcastStateMetaInfoSnapshots = new ArrayList<>(numBroadcastStates); for (int i = 0; i < numBroadcastStates; i++) { broadcastStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } } else { broadcastStateMetaInfoSnapshots = new ArrayList<>(); } }
Example #5
Source File: SerializationProxiesTest.java From Flink-CEPplus with Apache License 2.0 | 5 votes |
@Test public void testOperatorStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredOperatorStateBackendMetaInfo<>( name, stateSerializer, OperatorStateHandle.Mode.UNION).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter().writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredOperatorStateBackendMetaInfo<?> restoredMetaInfo = new RegisteredOperatorStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals(OperatorStateHandle.Mode.UNION, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(stateSerializer, restoredMetaInfo.getPartitionStateSerializer()); }
Example #6
Source File: SerializationProxiesTest.java From Flink-CEPplus with Apache License 2.0 | 5 votes |
@Test public void testBroadcastStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> keySerializer = DoubleSerializer.INSTANCE; TypeSerializer<?> valueSerializer = StringSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredBroadcastStateBackendMetaInfo<>( name, OperatorStateHandle.Mode.BROADCAST, keySerializer, valueSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredBroadcastStateBackendMetaInfo<?, ?> restoredMetaInfo = new RegisteredBroadcastStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals( OperatorStateHandle.Mode.BROADCAST, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(keySerializer, restoredMetaInfo.getKeySerializer()); Assert.assertEquals(valueSerializer, restoredMetaInfo.getValueSerializer()); }
Example #7
Source File: OperatorBackendSerializationProxy.java From flink with Apache License 2.0 | 5 votes |
@Override public void read(DataInputView in) throws IOException { super.read(in); final int proxyReadVersion = getReadVersion(); final Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(proxyReadVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for operator backend serialization readVersion=" + proxyReadVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); int numOperatorStates = in.readShort(); operatorStateMetaInfoSnapshots = new ArrayList<>(numOperatorStates); for (int i = 0; i < numOperatorStates; i++) { operatorStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } if (proxyReadVersion >= 3) { // broadcast states did not exist prior to version 3 int numBroadcastStates = in.readShort(); broadcastStateMetaInfoSnapshots = new ArrayList<>(numBroadcastStates); for (int i = 0; i < numBroadcastStates; i++) { broadcastStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } } else { broadcastStateMetaInfoSnapshots = new ArrayList<>(); } }
Example #8
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 5 votes |
@Test public void testOperatorStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredOperatorStateBackendMetaInfo<>( name, stateSerializer, OperatorStateHandle.Mode.UNION).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter().writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredOperatorStateBackendMetaInfo<?> restoredMetaInfo = new RegisteredOperatorStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals(OperatorStateHandle.Mode.UNION, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(stateSerializer, restoredMetaInfo.getPartitionStateSerializer()); }
Example #9
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 5 votes |
@Test public void testBroadcastStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> keySerializer = DoubleSerializer.INSTANCE; TypeSerializer<?> valueSerializer = StringSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredBroadcastStateBackendMetaInfo<>( name, OperatorStateHandle.Mode.BROADCAST, keySerializer, valueSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredBroadcastStateBackendMetaInfo<?, ?> restoredMetaInfo = new RegisteredBroadcastStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals( OperatorStateHandle.Mode.BROADCAST, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(keySerializer, restoredMetaInfo.getKeySerializer()); Assert.assertEquals(valueSerializer, restoredMetaInfo.getValueSerializer()); }
Example #10
Source File: OperatorBackendSerializationProxy.java From flink with Apache License 2.0 | 5 votes |
@Override public void read(DataInputView in) throws IOException { super.read(in); final int proxyReadVersion = getReadVersion(); final Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(proxyReadVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for operator backend serialization readVersion=" + proxyReadVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); int numOperatorStates = in.readShort(); operatorStateMetaInfoSnapshots = new ArrayList<>(numOperatorStates); for (int i = 0; i < numOperatorStates; i++) { operatorStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } if (proxyReadVersion >= 3) { // broadcast states did not exist prior to version 3 int numBroadcastStates = in.readShort(); broadcastStateMetaInfoSnapshots = new ArrayList<>(numBroadcastStates); for (int i = 0; i < numBroadcastStates; i++) { broadcastStateMetaInfoSnapshots.add( stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader)); } } else { broadcastStateMetaInfoSnapshots = new ArrayList<>(); } }
Example #11
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 5 votes |
@Test public void testOperatorStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> stateSerializer = DoubleSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredOperatorStateBackendMetaInfo<>( name, stateSerializer, OperatorStateHandle.Mode.UNION).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter().writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredOperatorStateBackendMetaInfo<?> restoredMetaInfo = new RegisteredOperatorStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals(OperatorStateHandle.Mode.UNION, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(stateSerializer, restoredMetaInfo.getPartitionStateSerializer()); }
Example #12
Source File: SerializationProxiesTest.java From flink with Apache License 2.0 | 5 votes |
@Test public void testBroadcastStateMetaInfoSerialization() throws Exception { String name = "test"; TypeSerializer<?> keySerializer = DoubleSerializer.INSTANCE; TypeSerializer<?> valueSerializer = StringSerializer.INSTANCE; StateMetaInfoSnapshot snapshot = new RegisteredBroadcastStateBackendMetaInfo<>( name, OperatorStateHandle.Mode.BROADCAST, keySerializer, valueSerializer).snapshot(); byte[] serialized; try (ByteArrayOutputStreamWithPos out = new ByteArrayOutputStreamWithPos()) { StateMetaInfoSnapshotReadersWriters.getWriter(). writeStateMetaInfoSnapshot(snapshot, new DataOutputViewStreamWrapper(out)); serialized = out.toByteArray(); } try (ByteArrayInputStreamWithPos in = new ByteArrayInputStreamWithPos(serialized)) { final StateMetaInfoReader reader = StateMetaInfoSnapshotReadersWriters.getReader( CURRENT_STATE_META_INFO_SNAPSHOT_VERSION, StateMetaInfoSnapshotReadersWriters.StateTypeHint.OPERATOR_STATE); snapshot = reader.readStateMetaInfoSnapshot( new DataInputViewStreamWrapper(in), Thread.currentThread().getContextClassLoader()); } RegisteredBroadcastStateBackendMetaInfo<?, ?> restoredMetaInfo = new RegisteredBroadcastStateBackendMetaInfo<>(snapshot); Assert.assertEquals(name, restoredMetaInfo.getName()); Assert.assertEquals( OperatorStateHandle.Mode.BROADCAST, restoredMetaInfo.getAssignmentMode()); Assert.assertEquals(keySerializer, restoredMetaInfo.getKeySerializer()); Assert.assertEquals(valueSerializer, restoredMetaInfo.getValueSerializer()); }
Example #13
Source File: KeyedBackendSerializationProxy.java From Flink-CEPplus with Apache License 2.0 | 4 votes |
@SuppressWarnings("unchecked") @Override public void read(DataInputView in) throws IOException { super.read(in); final int readVersion = getReadVersion(); if (readVersion >= 4) { usingKeyGroupCompression = in.readBoolean(); } else { usingKeyGroupCompression = false; } // only starting from version 3, we have the key serializer and its config snapshot written if (readVersion >= 6) { this.keySerializerSnapshot = TypeSerializerSnapshotSerializationUtil.readSerializerSnapshot( in, userCodeClassLoader, null); } else if (readVersion >= 3) { Tuple2<TypeSerializer<?>, TypeSerializerSnapshot<?>> keySerializerAndConfig = TypeSerializerSerializationUtil.readSerializersAndConfigsWithResilience(in, userCodeClassLoader).get(0); this.keySerializerSnapshot = (TypeSerializerSnapshot<K>) keySerializerAndConfig.f1; } else { this.keySerializerSnapshot = new BackwardsCompatibleSerializerSnapshot<>( TypeSerializerSerializationUtil.tryReadSerializer(in, userCodeClassLoader, true)); } this.keySerializer = null; Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(readVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for keyed backend serialization readVersion=" + readVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); int numKvStates = in.readShort(); stateMetaInfoSnapshots = new ArrayList<>(numKvStates); for (int i = 0; i < numKvStates; i++) { StateMetaInfoSnapshot snapshot = stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader); stateMetaInfoSnapshots.add(snapshot); } }
Example #14
Source File: KeyedBackendSerializationProxy.java From flink with Apache License 2.0 | 4 votes |
@SuppressWarnings("unchecked") @Override public void read(DataInputView in) throws IOException { super.read(in); final int readVersion = getReadVersion(); if (readVersion >= 4) { usingKeyGroupCompression = in.readBoolean(); } else { usingKeyGroupCompression = false; } // only starting from version 3, we have the key serializer and its config snapshot written if (readVersion >= 6) { this.keySerializerSnapshot = TypeSerializerSnapshotSerializationUtil.readSerializerSnapshot( in, userCodeClassLoader, null); } else if (readVersion >= 3) { Tuple2<TypeSerializer<?>, TypeSerializerSnapshot<?>> keySerializerAndConfig = TypeSerializerSerializationUtil.readSerializersAndConfigsWithResilience(in, userCodeClassLoader).get(0); this.keySerializerSnapshot = (TypeSerializerSnapshot<K>) keySerializerAndConfig.f1; } else { this.keySerializerSnapshot = new BackwardsCompatibleSerializerSnapshot<>( TypeSerializerSerializationUtil.tryReadSerializer(in, userCodeClassLoader, true)); } this.keySerializer = null; Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(readVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for keyed backend serialization readVersion=" + readVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); int numKvStates = in.readShort(); stateMetaInfoSnapshots = new ArrayList<>(numKvStates); for (int i = 0; i < numKvStates; i++) { StateMetaInfoSnapshot snapshot = stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader); stateMetaInfoSnapshots.add(snapshot); } }
Example #15
Source File: KeyedBackendSerializationProxy.java From flink with Apache License 2.0 | 4 votes |
@SuppressWarnings("unchecked") @Override public void read(DataInputView in) throws IOException { super.read(in); final int readVersion = getReadVersion(); if (readVersion >= 4) { usingKeyGroupCompression = in.readBoolean(); } else { usingKeyGroupCompression = false; } // only starting from version 3, we have the key serializer and its config snapshot written if (readVersion >= 6) { this.keySerializerSnapshot = TypeSerializerSnapshotSerializationUtil.readSerializerSnapshot( in, userCodeClassLoader, null); } else if (readVersion >= 3) { Tuple2<TypeSerializer<?>, TypeSerializerSnapshot<?>> keySerializerAndConfig = TypeSerializerSerializationUtil.readSerializersAndConfigsWithResilience(in, userCodeClassLoader).get(0); this.keySerializerSnapshot = (TypeSerializerSnapshot<K>) keySerializerAndConfig.f1; } else { this.keySerializerSnapshot = new BackwardsCompatibleSerializerSnapshot<>( TypeSerializerSerializationUtil.tryReadSerializer(in, userCodeClassLoader, true)); } this.keySerializer = null; Integer metaInfoSnapshotVersion = META_INFO_SNAPSHOT_FORMAT_VERSION_MAPPER.get(readVersion); if (metaInfoSnapshotVersion == null) { // this should not happen; guard for the future throw new IOException("Cannot determine corresponding meta info snapshot version for keyed backend serialization readVersion=" + readVersion); } final StateMetaInfoReader stateMetaInfoReader = StateMetaInfoSnapshotReadersWriters.getReader( metaInfoSnapshotVersion, StateMetaInfoSnapshotReadersWriters.StateTypeHint.KEYED_STATE); int numKvStates = in.readShort(); stateMetaInfoSnapshots = new ArrayList<>(numKvStates); for (int i = 0; i < numKvStates; i++) { StateMetaInfoSnapshot snapshot = stateMetaInfoReader.readStateMetaInfoSnapshot(in, userCodeClassLoader); stateMetaInfoSnapshots.add(snapshot); } }