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HDFS-6788. Improve synchronization in BPOfferService with read write lock. Contributed by Yongjun Zhang. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1615191 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andrew Wang 2014-08-01 18:56:25 +00:00
parent e86559fde3
commit 511234c828
2 changed files with 189 additions and 113 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
View File

@ -97,6 +97,9 @@ Release 2.6.0 - UNRELEASED
HDFS-6802. Some tests in TestDFSClientFailover are missing @Test
annotation. (Akira Ajisaka via wang)
HDFS-6788. Improve synchronization in BPOfferService with read write lock.
(Yongjun Zhang via wang)
OPTIMIZATIONS
HDFS-6690. Deduplicate xattr names in memory. (wang)

299
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java
View File

@ -21,6 +21,7 @@ import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.apache.commons.logging.Log;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
@ -38,6 +39,8 @@ import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* One instance per block-pool/namespace on the DN, which handles the
@ -91,6 +94,28 @@ class BPOfferService {
*/
private long lastActiveClaimTxId = -1;
private final ReentrantReadWriteLock mReadWriteLock =
new ReentrantReadWriteLock();
private final Lock mReadLock = mReadWriteLock.readLock();
private final Lock mWriteLock = mReadWriteLock.writeLock();
// utility methods to acquire and release read lock and write lock
void readLock() {
mReadLock.lock();
}
void readUnlock() {
mReadLock.unlock();
}
void writeLock() {
mWriteLock.lock();
}
void writeUnlock() {
mWriteLock.unlock();
}
BPOfferService(List<InetSocketAddress> nnAddrs, DataNode dn) {
Preconditions.checkArgument(!nnAddrs.isEmpty(),
"Must pass at least one NN.");
@ -135,14 +160,19 @@ class BPOfferService {
}
return false;
}
synchronized String getBlockPoolId() {
if (bpNSInfo != null) {
return bpNSInfo.getBlockPoolID();
} else {
LOG.warn("Block pool ID needed, but service not yet registered with NN",
new Exception("trace"));
return null;
String getBlockPoolId() {
readLock();
try {
if (bpNSInfo != null) {
return bpNSInfo.getBlockPoolID();
} else {
LOG.warn("Block pool ID needed, but service not yet registered with NN",
new Exception("trace"));
return null;
}
} finally {
readUnlock();
}
}
@ -150,27 +180,37 @@ class BPOfferService {
return getNamespaceInfo() != null;
}
synchronized NamespaceInfo getNamespaceInfo() {
return bpNSInfo;
NamespaceInfo getNamespaceInfo() {
readLock();
try {
return bpNSInfo;
} finally {
readUnlock();
}
}
@Override
public synchronized String toString() {
if (bpNSInfo == null) {
// If we haven't yet connected to our NN, we don't yet know our
// own block pool ID.
// If _none_ of the block pools have connected yet, we don't even
// know the DatanodeID ID of this DN.
String datanodeUuid = dn.getDatanodeUuid();
public String toString() {
readLock();
try {
if (bpNSInfo == null) {
// If we haven't yet connected to our NN, we don't yet know our
// own block pool ID.
// If _none_ of the block pools have connected yet, we don't even
// know the DatanodeID ID of this DN.
String datanodeUuid = dn.getDatanodeUuid();
if (datanodeUuid == null || datanodeUuid.isEmpty()) {
datanodeUuid = "unassigned";
if (datanodeUuid == null || datanodeUuid.isEmpty()) {
datanodeUuid = "unassigned";
}
return "Block pool <registering> (Datanode Uuid " + datanodeUuid + ")";
} else {
return "Block pool " + getBlockPoolId() +
" (Datanode Uuid " + dn.getDatanodeUuid() +
")";
}
return "Block pool <registering> (Datanode Uuid " + datanodeUuid + ")";
} else {
return "Block pool " + getBlockPoolId() +
" (Datanode Uuid " + dn.getDatanodeUuid() +
")";
} finally {
readUnlock();
}
}
@ -266,32 +306,37 @@ class BPOfferService {
* verifies that this namespace matches (eg to prevent a misconfiguration
* where a StandbyNode from a different cluster is specified)
*/
synchronized void verifyAndSetNamespaceInfo(NamespaceInfo nsInfo) throws IOException {
if (this.bpNSInfo == null) {
this.bpNSInfo = nsInfo;
boolean success = false;
void verifyAndSetNamespaceInfo(NamespaceInfo nsInfo) throws IOException {
writeLock();
try {
if (this.bpNSInfo == null) {
this.bpNSInfo = nsInfo;
boolean success = false;
// Now that we know the namespace ID, etc, we can pass this to the DN.
// The DN can now initialize its local storage if we are the
// first BP to handshake, etc.
try {
dn.initBlockPool(this);
success = true;
} finally {
if (!success) {
// The datanode failed to initialize the BP. We need to reset
// the namespace info so that other BPService actors still have
// a chance to set it, and re-initialize the datanode.
this.bpNSInfo = null;
// Now that we know the namespace ID, etc, we can pass this to the DN.
// The DN can now initialize its local storage if we are the
// first BP to handshake, etc.
try {
dn.initBlockPool(this);
success = true;
} finally {
if (!success) {
// The datanode failed to initialize the BP. We need to reset
// the namespace info so that other BPService actors still have
// a chance to set it, and re-initialize the datanode.
this.bpNSInfo = null;
}
}
} else {
checkNSEquality(bpNSInfo.getBlockPoolID(), nsInfo.getBlockPoolID(),
"Blockpool ID");
checkNSEquality(bpNSInfo.getNamespaceID(), nsInfo.getNamespaceID(),
"Namespace ID");
checkNSEquality(bpNSInfo.getClusterID(), nsInfo.getClusterID(),
"Cluster ID");
}
} else {
checkNSEquality(bpNSInfo.getBlockPoolID(), nsInfo.getBlockPoolID(),
"Blockpool ID");
checkNSEquality(bpNSInfo.getNamespaceID(), nsInfo.getNamespaceID(),
"Namespace ID");
checkNSEquality(bpNSInfo.getClusterID(), nsInfo.getClusterID(),
"Cluster ID");
} finally {
writeUnlock();
}
}
@ -300,22 +345,27 @@ class BPOfferService {
* NN, it calls this function to verify that the NN it connected to
* is consistent with other NNs serving the block-pool.
*/
synchronized void registrationSucceeded(BPServiceActor bpServiceActor,
void registrationSucceeded(BPServiceActor bpServiceActor,
DatanodeRegistration reg) throws IOException {
if (bpRegistration != null) {
checkNSEquality(bpRegistration.getStorageInfo().getNamespaceID(),
reg.getStorageInfo().getNamespaceID(), "namespace ID");
checkNSEquality(bpRegistration.getStorageInfo().getClusterID(),
reg.getStorageInfo().getClusterID(), "cluster ID");
} else {
bpRegistration = reg;
}
dn.bpRegistrationSucceeded(bpRegistration, getBlockPoolId());
// Add the initial block token secret keys to the DN's secret manager.
if (dn.isBlockTokenEnabled) {
dn.blockPoolTokenSecretManager.addKeys(getBlockPoolId(),
reg.getExportedKeys());
writeLock();
try {
if (bpRegistration != null) {
checkNSEquality(bpRegistration.getStorageInfo().getNamespaceID(),
reg.getStorageInfo().getNamespaceID(), "namespace ID");
checkNSEquality(bpRegistration.getStorageInfo().getClusterID(),
reg.getStorageInfo().getClusterID(), "cluster ID");
} else {
bpRegistration = reg;
}
dn.bpRegistrationSucceeded(bpRegistration, getBlockPoolId());
// Add the initial block token secret keys to the DN's secret manager.
if (dn.isBlockTokenEnabled) {
dn.blockPoolTokenSecretManager.addKeys(getBlockPoolId(),
reg.getExportedKeys());
}
} finally {
writeUnlock();
}
}
@ -333,25 +383,35 @@ class BPOfferService {
}
}
synchronized DatanodeRegistration createRegistration() {
Preconditions.checkState(bpNSInfo != null,
"getRegistration() can only be called after initial handshake");
return dn.createBPRegistration(bpNSInfo);
DatanodeRegistration createRegistration() {
writeLock();
try {
Preconditions.checkState(bpNSInfo != null,
"getRegistration() can only be called after initial handshake");
return dn.createBPRegistration(bpNSInfo);
} finally {
writeUnlock();
}
}
/**
* Called when an actor shuts down. If this is the last actor
* to shut down, shuts down the whole blockpool in the DN.
*/
synchronized void shutdownActor(BPServiceActor actor) {
if (bpServiceToActive == actor) {
bpServiceToActive = null;
}
void shutdownActor(BPServiceActor actor) {
writeLock();
try {
if (bpServiceToActive == actor) {
bpServiceToActive = null;
}
bpServices.remove(actor);
bpServices.remove(actor);
if (bpServices.isEmpty()) {
dn.shutdownBlockPool(this);
if (bpServices.isEmpty()) {
dn.shutdownBlockPool(this);
}
} finally {
writeUnlock();
}
}
@ -393,11 +453,16 @@ class BPOfferService {
* @return a proxy to the active NN, or null if the BPOS has not
* acknowledged any NN as active yet.
*/
synchronized DatanodeProtocolClientSideTranslatorPB getActiveNN() {
if (bpServiceToActive != null) {
return bpServiceToActive.bpNamenode;
} else {
return null;
DatanodeProtocolClientSideTranslatorPB getActiveNN() {
readLock();
try {
if (bpServiceToActive != null) {
return bpServiceToActive.bpNamenode;
} else {
return null;
}
} finally {
readUnlock();
}
}
@ -425,45 +490,50 @@ class BPOfferService {
* @param actor the actor which received the heartbeat
* @param nnHaState the HA-related heartbeat contents
*/
synchronized void updateActorStatesFromHeartbeat(
void updateActorStatesFromHeartbeat(
BPServiceActor actor,
NNHAStatusHeartbeat nnHaState) {
final long txid = nnHaState.getTxId();
final boolean nnClaimsActive =
nnHaState.getState() == HAServiceState.ACTIVE;
final boolean bposThinksActive = bpServiceToActive == actor;
final boolean isMoreRecentClaim = txid > lastActiveClaimTxId;
if (nnClaimsActive && !bposThinksActive) {
LOG.info("Namenode " + actor + " trying to claim ACTIVE state with " +
"txid=" + txid);
if (!isMoreRecentClaim) {
// Split-brain scenario - an NN is trying to claim active
// state when a different NN has already claimed it with a higher
// txid.
LOG.warn("NN " + actor + " tried to claim ACTIVE state at txid=" +
txid + " but there was already a more recent claim at txid=" +
lastActiveClaimTxId);
return;
} else {
if (bpServiceToActive == null) {
LOG.info("Acknowledging ACTIVE Namenode " + actor);
writeLock();
try {
final long txid = nnHaState.getTxId();
final boolean nnClaimsActive =
nnHaState.getState() == HAServiceState.ACTIVE;
final boolean bposThinksActive = bpServiceToActive == actor;
final boolean isMoreRecentClaim = txid > lastActiveClaimTxId;
if (nnClaimsActive && !bposThinksActive) {
LOG.info("Namenode " + actor + " trying to claim ACTIVE state with " +
"txid=" + txid);
if (!isMoreRecentClaim) {
// Split-brain scenario - an NN is trying to claim active
// state when a different NN has already claimed it with a higher
// txid.
LOG.warn("NN " + actor + " tried to claim ACTIVE state at txid=" +
txid + " but there was already a more recent claim at txid=" +
lastActiveClaimTxId);
return;
} else {
LOG.info("Namenode " + actor + " taking over ACTIVE state from " +
bpServiceToActive + " at higher txid=" + txid);
if (bpServiceToActive == null) {
LOG.info("Acknowledging ACTIVE Namenode " + actor);
} else {
LOG.info("Namenode " + actor + " taking over ACTIVE state from " +
bpServiceToActive + " at higher txid=" + txid);
}
bpServiceToActive = actor;
}
bpServiceToActive = actor;
} else if (!nnClaimsActive && bposThinksActive) {
LOG.info("Namenode " + actor + " relinquishing ACTIVE state with " +
"txid=" + nnHaState.getTxId());
bpServiceToActive = null;
}
} else if (!nnClaimsActive && bposThinksActive) {
LOG.info("Namenode " + actor + " relinquishing ACTIVE state with " +
"txid=" + nnHaState.getTxId());
bpServiceToActive = null;
}
if (bpServiceToActive == actor) {
assert txid >= lastActiveClaimTxId;
lastActiveClaimTxId = txid;
if (bpServiceToActive == actor) {
assert txid >= lastActiveClaimTxId;
lastActiveClaimTxId = txid;
}
} finally {
writeUnlock();
}
}
@ -534,11 +604,14 @@ class BPOfferService {
actor.reRegister();
return true;
}
synchronized (this) {
writeLock();
try {
if (actor == bpServiceToActive) {
return processCommandFromActive(cmd, actor);
} else {
return processCommandFromStandby(cmd, actor);
} finally {
writeUnlock();
}
}
}