org.apache.flink.contrib.streaming.state.iterator

类 RocksStatesPerKeyGroupMergeIterator

java.lang.Object

org.apache.flink.contrib.streaming.state.iterator.RocksStatesPerKeyGroupMergeIterator

所有已实现的接口:

AutoCloseable

public class RocksStatesPerKeyGroupMergeIterator
extends Object
implements AutoCloseable

Iterator that merges multiple RocksDB iterators to partition all states into contiguous key-groups. The resulting iteration sequence is ordered by (key-group, kv-state).

构造器概要

构造器

构造器和说明
RocksStatesPerKeyGroupMergeIterator(List<org.apache.flink.api.java.tuple.Tuple2<RocksIteratorWrapper,Integer>> kvStateIterators, int keyGroupPrefixByteCount)

方法概要

限定符和类型	方法和说明
void	close()
boolean	isNewKeyGroup() Indicates if current key starts a new key-group, i.e. belong to a different key-group than it's predecessor.
boolean	isNewKeyValueState() Indicates if current key starts a new k/v-state, i.e. belong to a different k/v-state than it's predecessor.
boolean	isValid() Check if the iterator is still valid.
byte[]	key()
int	keyGroup()
int	kvStateId()
void	next() Advances the iterator.
byte[]	value()

从类继承的方法 java.lang.Object

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

构造器详细资料

RocksStatesPerKeyGroupMergeIterator

public RocksStatesPerKeyGroupMergeIterator(List<org.apache.flink.api.java.tuple.Tuple2<RocksIteratorWrapper,Integer>> kvStateIterators,
                                           int keyGroupPrefixByteCount)

方法详细资料

next

public void next()

Advances the iterator. Should only be called if isValid() returned true. Valid flag can only change after calling next().

keyGroup

public int keyGroup()

返回:

key-group for the current key

key

public byte[] key()

value

public byte[] value()

kvStateId

public int kvStateId()

返回:

Id of K/V state to which the current key belongs.

isNewKeyValueState

public boolean isNewKeyValueState()

Indicates if current key starts a new k/v-state, i.e. belong to a different k/v-state than it's predecessor.

返回:

true iff the current key belong to a different k/v-state than it's predecessor.

isNewKeyGroup

public boolean isNewKeyGroup()

Indicates if current key starts a new key-group, i.e. belong to a different key-group than it's predecessor.

返回:

true iff the current key belong to a different key-group than it's predecessor.

isValid

public boolean isValid()

Check if the iterator is still valid. Getters like key(), value(), etc. as well as next() should only be called if valid returned true. Should be checked after each call to next() before accessing iterator state.

返回:

True iff this iterator is valid.

close

public void close()

指定者:

close 在接口中 AutoCloseable