Package org.apache.flink.runtime.util

Interface Summary

Interface	Description
GroupCache<G,K,V>	This GroupCache can cache group, key and value.
KeyGroupedIterator<E>
MemoryBlockIterator	The memory block iterator is an iterator that always buffers a block of elements in memory.
ResettableIterator<E>	The resettable iterator is a specialization of the iterator, allowing to reset the iterator and re-retrieve elements.
ResettableMutableObjectIterator<E>	The resettable iterator is a specialization of the iterator, allowing to reset the iterator and re-retrieve elements.

Class Summary

Class	Description
BooleanArrayList	Minimal implementation of an array-backed list of booleans
BoundedFIFOQueue<T>	BoundedFIFOQueue collects elements up to given amount.
ClusterUncaughtExceptionHandler	Utility for handling any uncaught exceptions
ConfigurationParserUtils	Utility class to extract related parameters from Configuration and to sanity check them.
DefaultGroupCache<G,K,V>	Default implement of GroupCache.
DefaultGroupCache.Factory<G,K,V>	The Factory of DefaultGroupCache.
DualKeyLinkedMap<A,B,V>	Map which stores values under two different indices.
EmptyIterator<E>	An empty iterator that never returns anything.
EmptyMutableObjectIterator<E>	An empty mutable object iterator that never returns anything.
EnvironmentInformation	Utility class that gives access to the execution environment of the JVM, like the executing user, startup options, or the JVM version.
EnvironmentInformation.RevisionInformation	Revision information encapsulates information about the source code revision of the Flink code.
ForwardingInputStream	Input stream, that wraps another input stream and forwards all method calls to the wrapped stream.
ForwardingOutputStream	OutputStream, that wraps another OutputStream and forwards all method calls to the wrapped stream.
HadoopConfigLoader	This class lazily loads hadoop configuration from resettable Flink's configuration.
HadoopUtils	Utility class for working with Hadoop-related classes.
Hardware	Convenience class to extract hardware specifics of the computer executing the running JVM.
IntArrayList	Minimal implementation of an array-backed list of ints
JvmShutdownSafeguard	A utility that guards against blocking shutdown hooks that block JVM shutdown.
JvmUtils	Utilities for ManagementFactory.
LeaderRetrievalUtils	Utility class to work with LeaderRetrievalService class.
LeaderRetrievalUtils.LeaderInformationListener	Helper class which is used by the retrieveLeaderInformation method to retrieve the leader's rpc URL and the current leader session ID.
LongArrayList	Minimal implementation of an array-backed list of longs
NonClosingInputStreamDecorator	Decorator for input streams that ignores calls to InputStream.close().
NonClosingOutputStreamDecorator	Decorator for input streams that ignores calls to OutputStream.close().
NonReusingKeyGroupedIterator<E>	The key grouped iterator returns a key and all values that share the same key.
NonReusingMutableToRegularIteratorWrapper<T>	This class wraps a MutableObjectIterator into a regular Iterator.
OperatorSubtaskDescriptionText	This class generates a string that can be used to identify an operator subtask.
RegularToMutableObjectIterator<T>
ResourceCounter	Counter for ResourceProfiles.
ResourceManagerUtils	Common utils for ResourceManager.
ReusingKeyGroupedIterator<E>	The KeyValueIterator returns a key and all values that belong to the key (share the same key).
ReusingMutableToRegularIteratorWrapper<T>	This class wraps a MutableObjectIterator into a regular Iterator.
Runnables	Utils related to Runnable.
SignalHandler	This signal handler / signal logger is based on Apache Hadoop's org.apache.hadoop.util.SignalLogger.
SingleElementIterator<E>	An Iterator that contains only a single element.
SlotSelectionStrategyUtils	Utility class for selecting SlotSelectionStrategy.
StateHandleStoreUtils	StateHandleStoreUtils collects utility methods that might be usefule for any StateHandleStore implementation.
ZooKeeperUtils	Class containing helper functions to interact with ZooKeeper.
ZooKeeperUtils.SecureAclProvider	Secure ACLProvider implementation.

Enum Summary

Enum	Description
ZooKeeperUtils.ZkClientACLMode	ZooKeeper client ACL mode enum.