Package org.apache.hadoop.hdfs.server.common

Interface Summary

Interface	Description
BlockAlias	Interface used to load provided blocks.
DataNodeLockManager<T extends AutoCloseDataSetLock>	Use for manage a set of lock for datanode.
HostRestrictingAuthorizationFilter.HttpInteraction
TokenVerifier<T extends org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier>	Interface to verify delegation tokens passed through WebHDFS.

Class Summary

Class	Description
AutoCloseDataSetLock	Extending AutoCloseableLock such that the users can use a try-with-resource syntax.
FileRegion	This class is used to represent provided blocks that are file regions, i.e., can be described using (path, offset, length).
HostRestrictingAuthorizationFilter	An HTTP filter that can filter requests based on Hosts.
MetricsLoggerTask	MetricsLoggerTask can be used as utility to dump metrics to log.
NoLockManager	Some ut or temp replicaMap not need to lock with DataSetLockManager.

Enum Summary

Enum	Description
DataNodeLockManager.LockLevel	Acquire block pool level first if you want to Acquire volume lock.
HdfsServerConstants.BlockUCState	States, which a block can go through while it is under construction.
HdfsServerConstants.NamenodeRole	Defines the NameNode role.
HdfsServerConstants.NodeType	Type of the node
HdfsServerConstants.ReplicaState	Block replica states, which it can go through while being constructed.
HdfsServerConstants.RollingUpgradeStartupOption	Startup options for rolling upgrade.
HdfsServerConstants.StartupOption	Startup options
Storage.StorageState