org.apache.hadoop.hdfs.server.datanode
Class ShortCircuitRegistry

java.lang.Object
  org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry

public class ShortCircuitRegistry
extends Object

Nested Class Summary

static class

ShortCircuitRegistry.NewShmInfo

Field Summary

static org.apache.commons.logging.Log

LOG

Constructor Summary

ShortCircuitRegistry(org.apache.hadoop.conf.Configuration conf)

Method Summary

ShortCircuitRegistry.NewShmInfo	createNewMemorySegment(String clientName, org.apache.hadoop.net.unix.DomainSocket sock) Handle a DFSClient request to create a new memory segment.
String	getClientNames(ExtendedBlockId blockId)
void	processBlockInvalidation(ExtendedBlockId blockId) Invalidate any slot associated with a blockId that we are invalidating (deleting) from this DataNode.
void	processBlockMlockEvent(ExtendedBlockId blockId) Process a block mlock event from the FsDatasetCache.
boolean	processBlockMunlockRequest(ExtendedBlockId blockId) Mark any slots associated with this blockId as unanchorable.
void	registerSlot(ExtendedBlockId blockId, ShortCircuitShm.SlotId slotId, boolean isCached)
void	removeShm(ShortCircuitShm shm)
void	shutdown()
void	unregisterSlot(ShortCircuitShm.SlotId slotId)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

ShortCircuitRegistry

public ShortCircuitRegistry(org.apache.hadoop.conf.Configuration conf)
                     throws IOException

Throws:

IOException

Method Detail

removeShm

public void removeShm(ShortCircuitShm shm)

processBlockMlockEvent

public void processBlockMlockEvent(ExtendedBlockId blockId)

Process a block mlock event from the FsDatasetCache.

Parameters:

blockId - The block that was mlocked.

processBlockMunlockRequest

public boolean processBlockMunlockRequest(ExtendedBlockId blockId)

Mark any slots associated with this blockId as unanchorable.

Parameters:

blockId - The block ID.

Returns:

True if we should allow the munlock request.

processBlockInvalidation

public void processBlockInvalidation(ExtendedBlockId blockId)

Invalidate any slot associated with a blockId that we are invalidating (deleting) from this DataNode. When a slot is invalid, the DFSClient will not use the corresponding replica for new read or mmap operations (although existing, ongoing read or mmap operations will complete.)

Parameters:

blockId - The block ID.

getClientNames

public String getClientNames(ExtendedBlockId blockId)

createNewMemorySegment

public ShortCircuitRegistry.NewShmInfo createNewMemorySegment(String clientName,
                                                              org.apache.hadoop.net.unix.DomainSocket sock)
                                                       throws IOException

Handle a DFSClient request to create a new memory segment.

Parameters:

clientName - Client name as reported by the client.

sock - The DomainSocket to associate with this memory segment. When this socket is closed, or the other side writes anything to the socket, the segment will be closed. This can happen at any time, including right after this function returns.

Returns:

A NewShmInfo object. The caller must close the NewShmInfo object once they are done with it.

Throws:

IOException - If the new memory segment could not be created.

registerSlot

public void registerSlot(ExtendedBlockId blockId,
                         ShortCircuitShm.SlotId slotId,
                         boolean isCached)
                  throws org.apache.hadoop.fs.InvalidRequestException

Throws:

org.apache.hadoop.fs.InvalidRequestException

unregisterSlot

public void unregisterSlot(ShortCircuitShm.SlotId slotId)
                    throws org.apache.hadoop.fs.InvalidRequestException

Throws:

org.apache.hadoop.fs.InvalidRequestException

shutdown

public void shutdown()