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HDFS-2576. Enhances the DistributedFileSystem's create API so that clients can specify favored datanodes for a file's blocks. Contributed by Devaraj Das and Pritam Damania. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1476395 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Devaraj Das 2013-04-26 20:39:51 +00:00
parent 95fa3e82e4
commit 5d2ffde68e
20 changed files with 539 additions and 41 deletions
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22
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
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@ -446,6 +446,28 @@ protected Node getNodeForNetworkLocation(Node node) {
return getNode(node.getNetworkLocation());
}
/**
* Given a string representation of a rack, return its children
* @param loc a path-like string representation of a rack
* @return a newly allocated list with all the node's children
*/
public List<Node> getDatanodesInRack(String loc) {
netlock.readLock().lock();
try {
loc = NodeBase.normalize(loc);
if (!NodeBase.ROOT.equals(loc)) {
loc = loc.substring(1);
}
InnerNode rack = (InnerNode) clusterMap.getLoc(loc);
if (rack == null) {
return null;
}
return new ArrayList<Node>(rack.getChildren());
} finally {
netlock.readLock().unlock();
}
}
/** Remove a node
* Update node counter and rack counter if necessary
* @param node node to be removed; can be null

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -22,6 +22,9 @@ Trunk (Unreleased)
Azure environments. (See breakdown of tasks below for subtasks and
contributors)
HDFS-2576. Enhances the DistributedFileSystem's create API so that clients
can specify favored datanodes for a file's blocks. (ddas)
IMPROVEMENTS
HDFS-4665. Move TestNetworkTopologyWithNodeGroup to common.

36
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
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@ -1207,7 +1207,7 @@ public DFSOutputStream create(String src,
ChecksumOpt checksumOpt)
throws IOException {
return create(src, permission, flag, true,
replication, blockSize, progress, buffersize, checksumOpt);
replication, blockSize, progress, buffersize, checksumOpt, null);
}
/**
@ -1241,6 +1241,29 @@ public DFSOutputStream create(String src,
Progressable progress,
int buffersize,
ChecksumOpt checksumOpt) throws IOException {
return create(src, permission, flag, createParent, replication, blockSize,
progress, buffersize, checksumOpt, null);
}
/**
* Same as {@link #create(String, FsPermission, EnumSet, boolean, short, long,
* Progressable, int, ChecksumOpt)} with the addition of favoredNodes that is
* a hint to where the namenode should place the file blocks.
* The favored nodes hint is not persisted in HDFS. Hence it may be honored
* at the creation time only. HDFS could move the blocks during balancing or
* replication, to move the blocks from favored nodes. A value of null means
* no favored nodes for this create
*/
public DFSOutputStream create(String src,
FsPermission permission,
EnumSet<CreateFlag> flag,
boolean createParent,
short replication,
long blockSize,
Progressable progress,
int buffersize,
ChecksumOpt checksumOpt,
InetSocketAddress[] favoredNodes) throws IOException {
checkOpen();
if (permission == null) {
permission = FsPermission.getFileDefault();
@ -1249,9 +1272,18 @@ public DFSOutputStream create(String src,
if(LOG.isDebugEnabled()) {
LOG.debug(src + ": masked=" + masked);
}
String[] favoredNodeStrs = null;
if (favoredNodes != null) {
favoredNodeStrs = new String[favoredNodes.length];
for (int i = 0; i < favoredNodes.length; i++) {
favoredNodeStrs[i] =
favoredNodes[i].getAddress().getHostAddress() + ":"
+ favoredNodes[i].getPort();
}
}
final DFSOutputStream result = DFSOutputStream.newStreamForCreate(this,
src, masked, flag, createParent, replication, blockSize, progress,
buffersize, dfsClientConf.createChecksum(checksumOpt));
buffersize, dfsClientConf.createChecksum(checksumOpt), favoredNodeStrs);
beginFileLease(src, result);
return result;
}

26
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
View File

@ -314,6 +314,7 @@ public DatanodeInfo load(DatanodeInfo key) throws Exception {
return key;
}
});
private String[] favoredNodes;
volatile boolean hasError = false;
volatile int errorIndex = -1;
private BlockConstructionStage stage; // block construction stage
@ -390,7 +391,11 @@ private DataStreamer(LocatedBlock lastBlock, HdfsFileStatus stat,
}
}
private void setFavoredNodes(String[] favoredNodes) {
this.favoredNodes = favoredNodes;
}
/**
* Initialize for data streaming
*/
@ -1176,7 +1181,7 @@ private LocatedBlock locateFollowingBlock(long start,
while (true) {
try {
return dfsClient.namenode.addBlock(src, dfsClient.clientName,
block, excludedNodes, fileId);
block, excludedNodes, fileId, favoredNodes);
} catch (RemoteException e) {
IOException ue =
e.unwrapRemoteException(FileNotFoundException.class,
@ -1317,7 +1322,7 @@ private DFSOutputStream(DFSClient dfsClient, String src, Progressable progress,
/** Construct a new output stream for creating a file. */
private DFSOutputStream(DFSClient dfsClient, String src, HdfsFileStatus stat,
EnumSet<CreateFlag> flag, Progressable progress,
DataChecksum checksum) throws IOException {
DataChecksum checksum, String[] favoredNodes) throws IOException {
this(dfsClient, src, progress, stat, checksum);
this.shouldSyncBlock = flag.contains(CreateFlag.SYNC_BLOCK);
@ -1325,12 +1330,15 @@ private DFSOutputStream(DFSClient dfsClient, String src, HdfsFileStatus stat,
checksum.getBytesPerChecksum());
streamer = new DataStreamer();
if (favoredNodes != null && favoredNodes.length != 0) {
streamer.setFavoredNodes(favoredNodes);
}
}
static DFSOutputStream newStreamForCreate(DFSClient dfsClient, String src,
FsPermission masked, EnumSet<CreateFlag> flag, boolean createParent,
short replication, long blockSize, Progressable progress, int buffersize,
DataChecksum checksum) throws IOException {
DataChecksum checksum, String[] favoredNodes) throws IOException {
final HdfsFileStatus stat;
try {
stat = dfsClient.namenode.create(src, masked, dfsClient.clientName,
@ -1347,11 +1355,19 @@ static DFSOutputStream newStreamForCreate(DFSClient dfsClient, String src,
UnresolvedPathException.class);
}
final DFSOutputStream out = new DFSOutputStream(dfsClient, src, stat,
flag, progress, checksum);
flag, progress, checksum, favoredNodes);
out.start();
return out;
}
static DFSOutputStream newStreamForCreate(DFSClient dfsClient, String src,
FsPermission masked, EnumSet<CreateFlag> flag, boolean createParent,
short replication, long blockSize, Progressable progress, int buffersize,
DataChecksum checksum) throws IOException {
return newStreamForCreate(dfsClient, src, masked, flag, createParent, replication,
blockSize, progress, buffersize, checksum, null);
}
/** Construct a new output stream for append. */
private DFSOutputStream(DFSClient dfsClient, String src,
Progressable progress, LocatedBlock lastBlock, HdfsFileStatus stat,

21
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
View File

@ -265,6 +265,27 @@ public HdfsDataOutputStream create(Path f, FsPermission permission,
: EnumSet.of(CreateFlag.CREATE), bufferSize, replication,
blockSize, progress, null);
}
/**
* Same as
* {@link #create(Path, FsPermission, boolean, int, short, long,
* Progressable)} with the addition of favoredNodes that is a hint to
* where the namenode should place the file blocks.
* The favored nodes hint is not persisted in HDFS. Hence it may be honored
* at the creation time only. HDFS could move the blocks during balancing or
* replication, to move the blocks from favored nodes. A value of null means
* no favored nodes for this create
*/
public HdfsDataOutputStream create(Path f, FsPermission permission,
boolean overwrite, int bufferSize, short replication, long blockSize,
Progressable progress, InetSocketAddress[] favoredNodes) throws IOException {
statistics.incrementWriteOps(1);
final DFSOutputStream out = dfs.create(getPathName(f), permission,
overwrite ? EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE)
: EnumSet.of(CreateFlag.CREATE),
true, replication, blockSize, progress, bufferSize, null, favoredNodes);
return new HdfsDataOutputStream(out, statistics);
}
@Override
public HdfsDataOutputStream create(Path f, FsPermission permission,

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java
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@ -300,6 +300,8 @@ public void abandonBlock(ExtendedBlock b, String src, String holder)
* @param excludeNodes a list of nodes that should not be
* allocated for the current block
* @param fileId the id uniquely identifying a file
* @param favoredNodes the list of nodes where the client wants the blocks.
* Nodes are identified by either host name or address.
*
* @return LocatedBlock allocated block information.
*
@ -314,7 +316,8 @@ public void abandonBlock(ExtendedBlock b, String src, String holder)
*/
@Idempotent
public LocatedBlock addBlock(String src, String clientName,
ExtendedBlock previous, DatanodeInfo[] excludeNodes, long fileId)
ExtendedBlock previous, DatanodeInfo[] excludeNodes, long fileId,
String[] favoredNodes)
throws AccessControlException, FileNotFoundException,
NotReplicatedYetException, SafeModeException, UnresolvedLinkException,
IOException;

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java
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@ -355,12 +355,15 @@ public AddBlockResponseProto addBlock(RpcController controller,
try {
List<DatanodeInfoProto> excl = req.getExcludeNodesList();
List<String> favor = req.getFavoredNodesList();
LocatedBlock result = server.addBlock(
req.getSrc(),
req.getClientName(),
req.hasPrevious() ? PBHelper.convert(req.getPrevious()) : null,
(excl == null || excl.size() == 0) ? null : PBHelper.convert(excl
.toArray(new DatanodeInfoProto[excl.size()])), req.getFileId());
.toArray(new DatanodeInfoProto[excl.size()])), req.getFileId(),
(favor == null || favor.size() == 0) ? null : favor
.toArray(new String[favor.size()]));
return AddBlockResponseProto.newBuilder()
.setBlock(PBHelper.convert(result)).build();
} catch (IOException e) {

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java
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@ -302,7 +302,8 @@ public void abandonBlock(ExtendedBlock b, String src, String holder)
@Override
public LocatedBlock addBlock(String src, String clientName,
ExtendedBlock previous, DatanodeInfo[] excludeNodes, long fileId)
ExtendedBlock previous, DatanodeInfo[] excludeNodes, long fileId,
String[] favoredNodes)
throws AccessControlException, FileNotFoundException,
NotReplicatedYetException, SafeModeException, UnresolvedLinkException,
IOException {
@ -312,6 +313,9 @@ public LocatedBlock addBlock(String src, String clientName,
req.setPrevious(PBHelper.convert(previous));
if (excludeNodes != null)
req.addAllExcludeNodes(PBHelper.convert(excludeNodes));
if (favoredNodes != null) {
req.addAllFavoredNodes(Arrays.asList(favoredNodes));
}
try {
return PBHelper.convert(rpcProxy.addBlock(null, req.build()).getBlock());
} catch (ServiceException e) {

29
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
View File

@ -59,6 +59,7 @@
import org.apache.hadoop.hdfs.server.blockmanagement.PendingDataNodeMessages.ReportedBlockInfo;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.FSClusterStats;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
@ -72,6 +73,7 @@
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.net.NodeBase;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.Time;
@ -1333,11 +1335,12 @@ int computeReplicationWorkForBlocks(List<List<Block>> blocksToReplicate) {
public DatanodeDescriptor[] chooseTarget(final String src,
final int numOfReplicas, final DatanodeDescriptor client,
final HashMap<Node, Node> excludedNodes,
final long blocksize) throws IOException {
// choose targets for the new block to be allocated.
final long blocksize, List<String> favoredNodes) throws IOException {
List<DatanodeDescriptor> favoredDatanodeDescriptors =
getDatanodeDescriptors(favoredNodes);
final DatanodeDescriptor targets[] = blockplacement.chooseTarget(src,
numOfReplicas, client, new ArrayList<DatanodeDescriptor>(), false,
excludedNodes, blocksize);
numOfReplicas, client, excludedNodes, blocksize,
favoredDatanodeDescriptors);
if (targets.length < minReplication) {
throw new IOException("File " + src + " could only be replicated to "
+ targets.length + " nodes instead of minReplication (="
@ -1350,6 +1353,24 @@ public DatanodeDescriptor[] chooseTarget(final String src,
return targets;
}
/**
* Get list of datanode descriptors for given list of nodes. Nodes are
* hostaddress:port or just hostaddress.
*/
List<DatanodeDescriptor> getDatanodeDescriptors(List<String> nodes) {
List<DatanodeDescriptor> datanodeDescriptors = null;
if (nodes != null) {
datanodeDescriptors = new ArrayList<DatanodeDescriptor>(nodes.size());
for (int i = 0; i < nodes.size(); i++) {
DatanodeDescriptor node = datanodeManager.getDatanodeDescriptor(nodes.get(i));
if (node != null) {
datanodeDescriptors.add(node);
}
}
}
return datanodeDescriptors;
}
/**
* Parse the data-nodes the block belongs to and choose one,
* which will be the replication source.

19
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicy.java
View File

@ -118,6 +118,25 @@ DatanodeDescriptor[] chooseTarget(BlockCollection srcBC,
return chooseTarget(srcBC.getName(), numOfReplicas, writer,
chosenNodes, false, excludedNodes, blocksize);
}
/**
* Same as {@link #chooseTarget(String, int, DatanodeDescriptor, List, boolean,
* HashMap, long)} with added parameter {@code favoredDatanodes}
* @param favoredNodes datanodes that should be favored as targets. This
* is only a hint and due to cluster state, namenode may not be
* able to place the blocks on these datanodes.
*/
DatanodeDescriptor[] chooseTarget(String src,
int numOfReplicas, DatanodeDescriptor writer,
HashMap<Node, Node> excludedNodes,
long blocksize, List<DatanodeDescriptor> favoredNodes) {
// This class does not provide the functionality of placing
// a block in favored datanodes. The implementations of this class
// are expected to provide this functionality
return chooseTarget(src, numOfReplicas, writer,
new ArrayList<DatanodeDescriptor>(numOfReplicas), false, excludedNodes,
blocksize);
}
/**
* Verify that the block is replicated on at least minRacks different racks

78
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
View File

@ -125,6 +125,60 @@ public DatanodeDescriptor[] chooseTarget(String srcPath,
excludedNodes, blocksize);
}
@Override
DatanodeDescriptor[] chooseTarget(String src, int numOfReplicas,
DatanodeDescriptor writer, HashMap<Node, Node> excludedNodes,
long blocksize, List<DatanodeDescriptor> favoredNodes) {
try {
if (favoredNodes == null || favoredNodes.size() == 0) {
// Favored nodes not specified, fall back to regular block placement.
return chooseTarget(src, numOfReplicas, writer,
new ArrayList<DatanodeDescriptor>(numOfReplicas), false,
excludedNodes, blocksize);
}
HashMap<Node, Node> favoriteAndExcludedNodes = excludedNodes == null ?
new HashMap<Node, Node>() : new HashMap<Node, Node>(excludedNodes);
// Choose favored nodes
List<DatanodeDescriptor> results = new ArrayList<DatanodeDescriptor>();
boolean avoidStaleNodes = stats != null
&& stats.isAvoidingStaleDataNodesForWrite();
for (int i = 0; i < Math.min(favoredNodes.size(), numOfReplicas); i++) {
DatanodeDescriptor favoredNode = favoredNodes.get(i);
// Choose a single node which is local to favoredNode.
// 'results' is updated within chooseLocalNode
DatanodeDescriptor target = chooseLocalNode(favoredNode,
favoriteAndExcludedNodes, blocksize,
getMaxNodesPerRack(results,
numOfReplicas)[1], results, avoidStaleNodes);
if (target == null) {
LOG.warn("Could not find a target for file " + src
+ " with favored node " + favoredNode);
continue;
}
favoriteAndExcludedNodes.put(target, target);
}
if (results.size() < numOfReplicas) {
// Not enough favored nodes, choose other nodes.
numOfReplicas -= results.size();
DatanodeDescriptor[] remainingTargets =
chooseTarget(src, numOfReplicas, writer, results,
false, favoriteAndExcludedNodes, blocksize);
for (int i = 0; i < remainingTargets.length; i++) {
results.add(remainingTargets[i]);
}
}
return results.toArray(new DatanodeDescriptor[results.size()]);
} catch (NotEnoughReplicasException nr) {
// Fall back to regular block placement disregarding favored nodes hint
return chooseTarget(src, numOfReplicas, writer,
new ArrayList<DatanodeDescriptor>(numOfReplicas), false,
excludedNodes, blocksize);
}
}
/** This is the implementation. */
DatanodeDescriptor[] chooseTarget(int numOfReplicas,
DatanodeDescriptor writer,
@ -140,15 +194,9 @@ DatanodeDescriptor[] chooseTarget(int numOfReplicas,
excludedNodes = new HashMap<Node, Node>();
}
int clusterSize = clusterMap.getNumOfLeaves();
int totalNumOfReplicas = chosenNodes.size()+numOfReplicas;
if (totalNumOfReplicas > clusterSize) {
numOfReplicas -= (totalNumOfReplicas-clusterSize);
totalNumOfReplicas = clusterSize;
}
int maxNodesPerRack =
(totalNumOfReplicas-1)/clusterMap.getNumOfRacks()+2;
int[] result = getMaxNodesPerRack(chosenNodes, numOfReplicas);
numOfReplicas = result[0];
int maxNodesPerRack = result[1];
List<DatanodeDescriptor> results =
new ArrayList<DatanodeDescriptor>(chosenNodes);
@ -174,6 +222,18 @@ DatanodeDescriptor[] chooseTarget(int numOfReplicas,
return getPipeline((writer==null)?localNode:writer,
results.toArray(new DatanodeDescriptor[results.size()]));
}
private int[] getMaxNodesPerRack(List<DatanodeDescriptor> chosenNodes,
int numOfReplicas) {
int clusterSize = clusterMap.getNumOfLeaves();
int totalNumOfReplicas = chosenNodes.size()+numOfReplicas;
if (totalNumOfReplicas > clusterSize) {
numOfReplicas -= (totalNumOfReplicas-clusterSize);
totalNumOfReplicas = clusterSize;
}
int maxNodesPerRack = (totalNumOfReplicas-1)/clusterMap.getNumOfRacks()+2;
return new int[] {numOfReplicas, maxNodesPerRack};
}
/* choose <i>numOfReplicas</i> from all data nodes */
private DatanodeDescriptor chooseTarget(int numOfReplicas,

75
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
View File

@ -326,6 +326,68 @@ public DatanodeDescriptor getDatanodeByHost(final String host) {
return host2DatanodeMap.getDatanodeByHost(host);
}
/** @return the datanode descriptor for the host. */
public DatanodeDescriptor getDatanodeByXferAddr(String host, int xferPort) {
return host2DatanodeMap.getDatanodeByXferAddr(host, xferPort);
}
/**
* Given datanode address or host name, returns the DatanodeDescriptor for the
* same, or if it doesn't find the datanode, it looks for a machine local and
* then rack local datanode, if a rack local datanode is not possible either,
* it returns the DatanodeDescriptor of any random node in the cluster.
*
* @param address hostaddress:transfer address
* @return the best match for the given datanode
* @throws IOException when no datanode is found for given address
*/
DatanodeDescriptor getDatanodeDescriptor(String address) {
DatanodeDescriptor node = null;
int colon = address.indexOf(":");
int xferPort;
String host = address;
if (colon > 0) {
host = address.substring(0, colon);
xferPort = Integer.parseInt(address.substring(colon+1));
node = getDatanodeByXferAddr(host, xferPort);
}
if (node == null) {
node = getDatanodeByHost(host);
}
if (node == null) {
String networkLocation = resolveNetworkLocation(host);
// If the current cluster doesn't contain the node, fallback to
// something machine local and then rack local.
List<Node> rackNodes = getNetworkTopology()
.getDatanodesInRack(networkLocation);
if (rackNodes != null) {
// Try something machine local.
for (Node rackNode : rackNodes) {
if (((DatanodeDescriptor) rackNode).getIpAddr().equals(host)) {
node = (DatanodeDescriptor) rackNode;
break;
}
}
// Try something rack local.
if (node == null && !rackNodes.isEmpty()) {
node = (DatanodeDescriptor) (rackNodes
.get(DFSUtil.getRandom().nextInt(rackNodes.size())));
}
}
// If we can't even choose rack local, just choose any node in the
// cluster.
if (node == null) {
node = (DatanodeDescriptor)getNetworkTopology()
.chooseRandom(NodeBase.ROOT);
}
}
return node;
}
/** Get a datanode descriptor given corresponding storageID */
DatanodeDescriptor getDatanode(final String storageID) {
return datanodeMap.get(storageID);
@ -455,8 +517,13 @@ private void wipeDatanode(final DatanodeID node) {
}
}
public String resolveNetworkLocation(String host) {
DatanodeID d = parseDNFromHostsEntry(host);
return resolveNetworkLocation(d);
}
/* Resolve a node's network location */
private void resolveNetworkLocation (DatanodeDescriptor node) {
private String resolveNetworkLocation (DatanodeID node) {
List<String> names = new ArrayList<String>(1);
if (dnsToSwitchMapping instanceof CachedDNSToSwitchMapping) {
names.add(node.getIpAddr());
@ -474,7 +541,7 @@ private void resolveNetworkLocation (DatanodeDescriptor node) {
} else {
networkLocation = rName.get(0);
}
node.setNetworkLocation(networkLocation);
return networkLocation;
}
private boolean inHostsList(DatanodeID node) {
@ -707,7 +774,7 @@ nodes with its data cleared (or user can just remove the StorageID
nodeS.setDisallowed(false); // Node is in the include list
// resolve network location
resolveNetworkLocation(nodeS);
nodeS.setNetworkLocation(resolveNetworkLocation(nodeS));
getNetworkTopology().add(nodeS);
// also treat the registration message as a heartbeat
@ -739,7 +806,7 @@ nodes with its data cleared (or user can just remove the StorageID
= new DatanodeDescriptor(nodeReg, NetworkTopology.DEFAULT_RACK);
boolean success = false;
try {
resolveNetworkLocation(nodeDescr);
nodeDescr.setNetworkLocation(resolveNetworkLocation(nodeDescr));
networktopology.add(nodeDescr);
// register new datanode

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
View File

@ -2213,7 +2213,8 @@ void setBlockPoolId(String bpid) {
* client to "try again later".
*/
LocatedBlock getAdditionalBlock(String src, long fileId, String clientName,
ExtendedBlock previous, HashMap<Node, Node> excludedNodes)
ExtendedBlock previous, HashMap<Node, Node> excludedNodes,
List<String> favoredNodes)
throws LeaseExpiredException, NotReplicatedYetException,
QuotaExceededException, SafeModeException, UnresolvedLinkException,
IOException {
@ -2253,8 +2254,8 @@ LocatedBlock getAdditionalBlock(String src, long fileId, String clientName,
}
// choose targets for the new block to be allocated.
final DatanodeDescriptor targets[] = getBlockManager().chooseTarget(
src, replication, clientNode, excludedNodes, blockSize);
final DatanodeDescriptor targets[] = getBlockManager().chooseTarget(
src, replication, clientNode, excludedNodes, blockSize, favoredNodes);
// Part II.
// Allocate a new block, add it to the INode and the BlocksMap.

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
View File

@ -29,6 +29,7 @@
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.hadoop.conf.Configuration;
@ -482,7 +483,8 @@ public void setOwner(String src, String username, String groupname)
@Override
public LocatedBlock addBlock(String src, String clientName,
ExtendedBlock previous, DatanodeInfo[] excludedNodes, long fileId)
ExtendedBlock previous, DatanodeInfo[] excludedNodes, long fileId,
String[] favoredNodes)
throws IOException {
if (stateChangeLog.isDebugEnabled()) {
stateChangeLog.debug("*BLOCK* NameNode.addBlock: file " + src
@ -495,8 +497,10 @@ public LocatedBlock addBlock(String src, String clientName,
excludedNodesSet.put(node, node);
}
}
List<String> favoredNodesList = (favoredNodes == null) ? null
: Arrays.asList(favoredNodes);
LocatedBlock locatedBlock = namesystem.getAdditionalBlock(src, fileId,
clientName, previous, excludedNodesSet);
clientName, previous, excludedNodesSet, favoredNodesList);
if (locatedBlock != null)
metrics.incrAddBlockOps();
return locatedBlock;

1
hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto
View File

@ -121,6 +121,7 @@ message AddBlockRequestProto {
optional ExtendedBlockProto previous = 3;
repeated DatanodeInfoProto excludeNodes = 4;
optional uint64 fileId = 5 [default = 0]; // default as a bogus id
repeated string favoredNodes = 6; //the set of datanodes to use for the block
}
message AddBlockResponseProto {

6
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientRetries.java
View File

@ -241,7 +241,7 @@ public Object answer(InvocationOnMock invocation)
anyString(),
any(ExtendedBlock.class),
any(DatanodeInfo[].class),
anyLong())).thenAnswer(answer);
anyLong(), any(String[].class))).thenAnswer(answer);
Mockito.doReturn(
new HdfsFileStatus(0, false, 1, 1024, 0, 0, new FsPermission(
@ -390,7 +390,7 @@ public LocatedBlock answer(InvocationOnMock invocation) throws Throwable {
}
}).when(spyNN).addBlock(Mockito.anyString(), Mockito.anyString(),
Mockito.<ExtendedBlock> any(), Mockito.<DatanodeInfo[]> any(),
Mockito.anyLong());
Mockito.anyLong(), Mockito.<String[]> any());
doAnswer(new Answer<Boolean>() {
@ -432,7 +432,7 @@ public Boolean answer(InvocationOnMock invocation) throws Throwable {
Mockito.verify(spyNN, Mockito.atLeastOnce()).addBlock(
Mockito.anyString(), Mockito.anyString(),
Mockito.<ExtendedBlock> any(), Mockito.<DatanodeInfo[]> any(),
Mockito.anyLong());
Mockito.anyLong(), Mockito.<String[]> any());
Mockito.verify(spyNN, Mockito.atLeastOnce()).complete(
Mockito.anyString(), Mockito.anyString(),
Mockito.<ExtendedBlock>any());

4
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileCreation.java
View File

@ -519,7 +519,7 @@ public void testFileCreationError2() throws IOException {
// add one block to the file
LocatedBlock location = client.getNamenode().addBlock(file1.toString(),
client.clientName, null, null, INodeId.GRANDFATHER_INODE_ID);
client.clientName, null, null, INodeId.GRANDFATHER_INODE_ID, null);
System.out.println("testFileCreationError2: "
+ "Added block " + location.getBlock());
@ -570,7 +570,7 @@ public void testFileCreationError3() throws IOException {
createFile(dfs, f, 3);
try {
cluster.getNameNodeRpc().addBlock(f.toString(), client.clientName,
null, null, INodeId.GRANDFATHER_INODE_ID);
null, null, INodeId.GRANDFATHER_INODE_ID, null);
fail();
} catch(IOException ioe) {
FileSystem.LOG.info("GOOD!", ioe);

2
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java
View File

@ -1059,7 +1059,7 @@ private ExtendedBlock addBlocks(String fileName, String clientName)
ExtendedBlock prevBlock = null;
for(int jdx = 0; jdx < blocksPerFile; jdx++) {
LocatedBlock loc = nameNodeProto.addBlock(fileName, clientName,
prevBlock, null, INodeId.GRANDFATHER_INODE_ID);
prevBlock, null, INodeId.GRANDFATHER_INODE_ID, null);
prevBlock = loc.getBlock();
for(DatanodeInfo dnInfo : loc.getLocations()) {
int dnIdx = Arrays.binarySearch(datanodes, dnInfo.getXferAddr());

7
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddBlockRetry.java
View File

@ -26,6 +26,7 @@
import java.lang.reflect.Field;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
@ -108,7 +109,7 @@ public DatanodeDescriptor[] answer(InvocationOnMock invocation)
if(count == 1) { // run second addBlock()
LOG.info("Starting second addBlock for " + src);
nn.addBlock(src, "clientName", null, null,
INodeId.GRANDFATHER_INODE_ID);
INodeId.GRANDFATHER_INODE_ID, null);
LocatedBlocks lbs = nn.getBlockLocations(src, 0, Long.MAX_VALUE);
assertEquals("Must be one block", 1, lbs.getLocatedBlocks().size());
lb2 = lbs.get(0);
@ -119,7 +120,7 @@ public DatanodeDescriptor[] answer(InvocationOnMock invocation)
}
}).when(spyBM).chooseTarget(Mockito.anyString(), Mockito.anyInt(),
Mockito.<DatanodeDescriptor>any(), Mockito.<HashMap<Node, Node>>any(),
Mockito.anyLong());
Mockito.anyLong(), Mockito.<List<String>>any());
// create file
nn.create(src, FsPermission.getFileDefault(),
@ -129,7 +130,7 @@ public DatanodeDescriptor[] answer(InvocationOnMock invocation)
// start first addBlock()
LOG.info("Starting first addBlock for " + src);
nn.addBlock(src, "clientName", null, null, INodeId.GRANDFATHER_INODE_ID);
nn.addBlock(src, "clientName", null, null, INodeId.GRANDFATHER_INODE_ID, null);
// check locations
LocatedBlocks lbs = nn.getBlockLocations(src, 0, Long.MAX_VALUE);

220
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFavoredNodesEndToEnd.java Normal file
View File

@ -0,0 +1,220 @@
/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.namenode;
import static org.junit.Assert.*;
import java.util.ArrayList;
import java.util.Random;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.junit.Test;
import org.junit.AfterClass;
import org.junit.BeforeClass;
public class TestFavoredNodesEndToEnd {
private static MiniDFSCluster cluster;
private static Configuration conf;
private final static int NUM_DATA_NODES = 10;
private final static int NUM_FILES = 10;
private final static byte[] SOME_BYTES = new String("foo").getBytes();
private static DistributedFileSystem dfs;
private static ArrayList<DataNode> datanodes;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
conf = new Configuration();
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(NUM_DATA_NODES)
.build();
cluster.waitClusterUp();
dfs = cluster.getFileSystem();
datanodes = cluster.getDataNodes();
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
if (cluster != null) {
cluster.shutdown();
}
}
@Test
public void testFavoredNodesEndToEnd() throws Exception {
//create 10 files with random preferred nodes
for (int i = 0; i < NUM_FILES; i++) {
Random rand = new Random(System.currentTimeMillis() + i);
//pass a new created rand so as to get a uniform distribution each time
//without too much collisions (look at the do-while loop in getDatanodes)
InetSocketAddress datanode[] = getDatanodes(rand);
Path p = new Path("/filename"+i);
FSDataOutputStream out = dfs.create(p, FsPermission.getDefault(), true,
4096, (short)3, (long)4096, null, datanode);
out.write(SOME_BYTES);
out.close();
BlockLocation[] locations =
dfs.getClient().getBlockLocations(p.toUri().getPath(), 0,
Long.MAX_VALUE);
//make sure we have exactly one block location, and three hosts
assertTrue(locations.length == 1 && locations[0].getHosts().length == 3);
//verify the files got created in the right nodes
for (BlockLocation loc : locations) {
String[] hosts = loc.getNames();
String[] hosts1 = getStringForInetSocketAddrs(datanode);
assertTrue(compareNodes(hosts, hosts1));
}
}
}
@Test
public void testWhenFavoredNodesNotPresent() throws Exception {
//when we ask for favored nodes but the nodes are not there, we should
//get some other nodes. In other words, the write to hdfs should not fail
//and if we do getBlockLocations on the file, we should see one blklocation
//and three hosts for that
Random rand = new Random(System.currentTimeMillis());
InetSocketAddress arbitraryAddrs[] = new InetSocketAddress[3];
for (int i = 0; i < 3; i++) {
arbitraryAddrs[i] = getArbitraryLocalHostAddr();
}
Path p = new Path("/filename-foo-bar");
FSDataOutputStream out = dfs.create(p, FsPermission.getDefault(), true,
4096, (short)3, (long)4096, null, arbitraryAddrs);
out.write(SOME_BYTES);
out.close();
BlockLocation[] locations =
dfs.getClient().getBlockLocations(p.toUri().getPath(), 0,
Long.MAX_VALUE);
assertTrue(locations.length == 1 && locations[0].getHosts().length == 3);
}
@Test
public void testWhenSomeNodesAreNotGood() throws Exception {
//make some datanode not "good" so that even if the client prefers it,
//the namenode would not give it as a replica to write to
DatanodeInfo d = cluster.getNameNode().getNamesystem().getBlockManager()
.getDatanodeManager().getDatanodeByXferAddr(
datanodes.get(0).getXferAddress().getAddress().getHostAddress(),
datanodes.get(0).getXferAddress().getPort());
//set the decommission status to true so that
//BlockPlacementPolicyDefault.isGoodTarget returns false for this dn
d.setDecommissioned();
InetSocketAddress addrs[] = new InetSocketAddress[3];
for (int i = 0; i < 3; i++) {
addrs[i] = datanodes.get(i).getXferAddress();
}
Path p = new Path("/filename-foo-bar-baz");
FSDataOutputStream out = dfs.create(p, FsPermission.getDefault(), true,
4096, (short)3, (long)4096, null, addrs);
out.write(SOME_BYTES);
out.close();
BlockLocation[] locations =
dfs.getClient().getBlockLocations(p.toUri().getPath(), 0,
Long.MAX_VALUE);
//reset the state
d.stopDecommission();
assertTrue(locations.length == 1 && locations[0].getHosts().length == 3);
//also make sure that the datanode[0] is not in the list of hosts
String datanode0 =
datanodes.get(0).getXferAddress().getAddress().getHostAddress()
+ ":" + datanodes.get(0).getXferAddress().getPort();
for (int i = 0; i < 3; i++) {
if (locations[0].getNames()[i].equals(datanode0)) {
fail(datanode0 + " not supposed to be a replica for the block");
}
}
}
private String[] getStringForInetSocketAddrs(InetSocketAddress[] datanode) {
String strs[] = new String[datanode.length];
for (int i = 0; i < datanode.length; i++) {
strs[i] = datanode[i].getAddress().getHostAddress() + ":" +
datanode[i].getPort();
}
return strs;
}
private boolean compareNodes(String[] dnList1, String[] dnList2) {
for (int i = 0; i < dnList1.length; i++) {
boolean matched = false;
for (int j = 0; j < dnList2.length; j++) {
if (dnList1[i].equals(dnList2[j])) {
matched = true;
break;
}
}
if (matched == false) {
fail(dnList1[i] + " not a favored node");
}
}
return true;
}
private InetSocketAddress[] getDatanodes(Random rand) {
//Get some unique random indexes
int idx1 = rand.nextInt(NUM_DATA_NODES);
int idx2;
do {
idx2 = rand.nextInt(NUM_DATA_NODES);
} while (idx1 == idx2);
int idx3;
do {
idx3 = rand.nextInt(NUM_DATA_NODES);
} while (idx2 == idx3 || idx1 == idx3);
InetSocketAddress[] addrs = new InetSocketAddress[3];
addrs[0] = datanodes.get(idx1).getXferAddress();
addrs[1] = datanodes.get(idx2).getXferAddress();
addrs[2] = datanodes.get(idx3).getXferAddress();
return addrs;
}
private InetSocketAddress getArbitraryLocalHostAddr()
throws UnknownHostException{
Random rand = new Random(System.currentTimeMillis());
int port = rand.nextInt(65535);
while (true) {
boolean conflict = false;
for (DataNode d : datanodes) {
if (d.getXferAddress().getPort() == port) {
port = rand.nextInt(65535);
conflict = true;
}
}
if (conflict == false) {
break;
}
}
return new InetSocketAddress(InetAddress.getLocalHost(), port);
}
}