BPServiceActor.java
/**
* 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.datanode;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY;
import static org.apache.hadoop.util.Time.monotonicNow;
import java.io.Closeable;
import java.io.EOFException;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketTimeoutException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
import org.apache.hadoop.hdfs.client.BlockReportOptions;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeStatus;
import org.apache.hadoop.hdfs.protocol.UnregisteredNodeException;
import org.apache.hadoop.hdfs.protocolPB.DatanodeLifelineProtocolClientSideTranslatorPB;
import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
import org.apache.hadoop.hdfs.server.common.IncorrectVersionException;
import org.apache.hadoop.hdfs.server.common.DataNodeLockManager.LockLevel;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.protocol.BlockReportContext;
import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException;
import org.apache.hadoop.hdfs.server.protocol.HeartbeatResponse;
import org.apache.hadoop.hdfs.server.protocol.InvalidBlockReportLeaseException;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.hdfs.server.protocol.SlowDiskReports;
import org.apache.hadoop.hdfs.server.protocol.SlowPeerReports;
import org.apache.hadoop.hdfs.server.protocol.StorageBlockReport;
import org.apache.hadoop.hdfs.server.protocol.StorageReport;
import org.apache.hadoop.hdfs.server.protocol.VolumeFailureSummary;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.util.VersionInfo;
import org.apache.hadoop.util.VersionUtil;
import org.slf4j.Logger;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.base.Joiner;
/**
* A thread per active or standby namenode to perform:
* <ul>
* <li> Pre-registration handshake with namenode</li>
* <li> Registration with namenode</li>
* <li> Send periodic heartbeats to the namenode</li>
* <li> Handle commands received from the namenode</li>
* </ul>
*/
@InterfaceAudience.Private
class BPServiceActor implements Runnable {
static final Logger LOG = DataNode.LOG;
final InetSocketAddress nnAddr;
HAServiceState state;
final BPOfferService bpos;
volatile long lastCacheReport = 0;
private final Scheduler scheduler;
Thread bpThread;
DatanodeProtocolClientSideTranslatorPB bpNamenode;
enum RunningState {
CONNECTING, INIT_FAILED, RUNNING, EXITED, FAILED;
}
private String serviceId = null;
private String nnId = null;
private volatile RunningState runningState = RunningState.CONNECTING;
private volatile boolean shouldServiceRun = true;
private volatile boolean isSlownode = false;
private final DataNode dn;
private final DNConf dnConf;
private long prevBlockReportId;
private long fullBlockReportLeaseId;
private final SortedSet<Integer> blockReportSizes =
Collections.synchronizedSortedSet(new TreeSet<>());
private final int maxDataLength;
private final IncrementalBlockReportManager ibrManager;
private DatanodeRegistration bpRegistration;
final LinkedList<BPServiceActorAction> bpThreadQueue
= new LinkedList<BPServiceActorAction>();
private final CommandProcessingThread commandProcessingThread;
BPServiceActor(String serviceId, String nnId, InetSocketAddress nnAddr,
InetSocketAddress lifelineNnAddr, BPOfferService bpos) {
this.bpos = bpos;
this.dn = bpos.getDataNode();
this.nnAddr = nnAddr;
this.lifelineSender = lifelineNnAddr != null ?
new LifelineSender(lifelineNnAddr) : null;
this.initialRegistrationComplete = lifelineNnAddr != null ?
new CountDownLatch(1) : null;
this.dnConf = dn.getDnConf();
this.ibrManager = new IncrementalBlockReportManager(
dnConf.ibrInterval,
dn.getMetrics());
prevBlockReportId = ThreadLocalRandom.current().nextLong();
fullBlockReportLeaseId = 0;
scheduler = new Scheduler(dnConf.heartBeatInterval,
dnConf.getLifelineIntervalMs(), dnConf.blockReportInterval,
dnConf.outliersReportIntervalMs);
// get the value of maxDataLength.
this.maxDataLength = dnConf.getMaxDataLength();
if (serviceId != null) {
this.serviceId = serviceId;
}
if (nnId != null) {
this.nnId = nnId;
}
commandProcessingThread = new CommandProcessingThread(this);
commandProcessingThread.start();
}
public DatanodeRegistration getBpRegistration() {
return bpRegistration;
}
IncrementalBlockReportManager getIbrManager() {
return ibrManager;
}
boolean isAlive() {
if (!shouldServiceRun || !bpThread.isAlive()) {
return false;
}
return runningState == BPServiceActor.RunningState.RUNNING
|| runningState == BPServiceActor.RunningState.CONNECTING;
}
String getRunningState() {
return runningState.toString();
}
@Override
public String toString() {
return bpos.toString() + " service to " + nnAddr;
}
InetSocketAddress getNNSocketAddress() {
return nnAddr;
}
private String getNameNodeAddress() {
return NetUtils.getHostPortString(getNNSocketAddress());
}
Map<String, String> getActorInfoMap() {
final Map<String, String> info = new HashMap<String, String>();
info.put("NamenodeAddress", getNameNodeAddress());
info.put("NamenodeHaState", state != null ? state.toString() : "Unknown");
info.put("BlockPoolID", bpos.getBlockPoolId());
info.put("ActorState", getRunningState());
info.put("LastHeartbeat",
String.valueOf(getScheduler().getLastHearbeatTime()));
info.put("LastHeartbeatResponseTime",
String.valueOf(getScheduler().getLastHeartbeatResponseTime()));
info.put("LastBlockReport",
String.valueOf(getScheduler().getLastBlockReportTime()));
info.put("maxBlockReportSize", String.valueOf(getMaxBlockReportSize()));
info.put("maxDataLength", String.valueOf(maxDataLength));
info.put("isSlownode", String.valueOf(isSlownode));
return info;
}
private final CountDownLatch initialRegistrationComplete;
private final LifelineSender lifelineSender;
/**
* Used to inject a spy NN in the unit tests.
*/
@VisibleForTesting
void setNameNode(DatanodeProtocolClientSideTranslatorPB dnProtocol) {
bpNamenode = dnProtocol;
}
@VisibleForTesting
String getNnId() {
return nnId;
}
@VisibleForTesting
DatanodeProtocolClientSideTranslatorPB getNameNodeProxy() {
return bpNamenode;
}
/**
* Used to inject a spy NN in the unit tests.
*/
@VisibleForTesting
void setLifelineNameNode(
DatanodeLifelineProtocolClientSideTranslatorPB dnLifelineProtocol) {
lifelineSender.lifelineNamenode = dnLifelineProtocol;
}
@VisibleForTesting
DatanodeLifelineProtocolClientSideTranslatorPB getLifelineNameNodeProxy() {
return lifelineSender.lifelineNamenode;
}
/**
* Perform the first part of the handshake with the NameNode.
* This calls <code>versionRequest</code> to determine the NN's
* namespace and version info. It automatically retries until
* the NN responds or the DN is shutting down.
*
* @return the NamespaceInfo
*/
@VisibleForTesting
NamespaceInfo retrieveNamespaceInfo() throws IOException {
NamespaceInfo nsInfo = null;
while (shouldRun()) {
try {
nsInfo = bpNamenode.versionRequest();
LOG.debug("{} received versionRequest response: {}", this, nsInfo);
break;
} catch(SocketTimeoutException e) { // namenode is busy
LOG.warn("Problem connecting to server: " + nnAddr);
} catch(IOException e ) { // namenode is not available
LOG.warn("Problem connecting to server: " + nnAddr);
}
// try again in a second
sleepAndLogInterrupts(5000, "requesting version info from NN");
}
if (nsInfo != null) {
checkNNVersion(nsInfo);
} else {
throw new IOException("DN shut down before block pool connected");
}
return nsInfo;
}
private void checkNNVersion(NamespaceInfo nsInfo)
throws IncorrectVersionException {
// build and layout versions should match
String nnVersion = nsInfo.getSoftwareVersion();
String minimumNameNodeVersion = dnConf.getMinimumNameNodeVersion();
if (VersionUtil.compareVersions(nnVersion, minimumNameNodeVersion) < 0) {
IncorrectVersionException ive = new IncorrectVersionException(
minimumNameNodeVersion, nnVersion, "NameNode", "DataNode");
LOG.warn(ive.getMessage());
throw ive;
}
String dnVersion = VersionInfo.getVersion();
if (!nnVersion.equals(dnVersion)) {
LOG.info("Reported NameNode version '" + nnVersion + "' does not match " +
"DataNode version '" + dnVersion + "' but is within acceptable " +
"limits. Note: This is normal during a rolling upgrade.");
}
}
private void connectToNNAndHandshake() throws IOException {
// get NN proxy
bpNamenode = dn.connectToNN(nnAddr);
// First phase of the handshake with NN - get the namespace
// info.
NamespaceInfo nsInfo = retrieveNamespaceInfo();
// init block pool lock when init.
dn.getDataSetLockManager().addLock(LockLevel.BLOCK_POOl,
nsInfo.getBlockPoolID());
// Verify that this matches the other NN in this HA pair.
// This also initializes our block pool in the DN if we are
// the first NN connection for this BP.
bpos.verifyAndSetNamespaceInfo(this, nsInfo);
state = nsInfo.getState();
/* set thread name again to include NamespaceInfo when it's available. */
this.bpThread.setName(formatThreadName("heartbeating", nnAddr));
// Second phase of the handshake with the NN.
register(nsInfo);
}
/**
* Run an immediate block report on this thread. Used by tests.
*/
@VisibleForTesting
void triggerBlockReportForTests() {
synchronized (ibrManager) {
scheduler.scheduleHeartbeat();
long oldBlockReportTime = scheduler.getNextBlockReportTime();
scheduler.forceFullBlockReportNow();
ibrManager.notifyAll();
while (oldBlockReportTime == scheduler.getNextBlockReportTime()) {
try {
ibrManager.wait(100);
} catch (InterruptedException e) {
return;
}
}
}
}
@VisibleForTesting
void triggerHeartbeatForTests() {
synchronized (ibrManager) {
final long nextHeartbeatTime = scheduler.scheduleHeartbeat();
ibrManager.notifyAll();
while (nextHeartbeatTime - scheduler.nextHeartbeatTime >= 0) {
try {
ibrManager.wait(100);
} catch (InterruptedException e) {
return;
}
}
}
}
private int getMaxBlockReportSize() {
int maxBlockReportSize = 0;
if (!blockReportSizes.isEmpty()) {
maxBlockReportSize = blockReportSizes.last();
}
return maxBlockReportSize;
}
private long generateUniqueBlockReportId() {
// Initialize the block report ID the first time through.
// Note that 0 is used on the NN to indicate "uninitialized", so we should
// not send a 0 value ourselves.
prevBlockReportId++;
while (prevBlockReportId == 0) {
prevBlockReportId = ThreadLocalRandom.current().nextLong();
}
return prevBlockReportId;
}
/**
* Report the list blocks to the Namenode
* @return DatanodeCommands returned by the NN. May be null.
* @throws IOException
*/
List<DatanodeCommand> blockReport(long fullBrLeaseId) throws IOException {
final ArrayList<DatanodeCommand> cmds = new ArrayList<DatanodeCommand>();
// Flush any block information that precedes the block report. Otherwise
// we have a chance that we will miss the delHint information
// or we will report an RBW replica after the BlockReport already reports
// a FINALIZED one.
ibrManager.sendIBRs(bpNamenode, bpRegistration,
bpos.getBlockPoolId(), getRpcMetricSuffix());
long brCreateStartTime = monotonicNow();
Map<DatanodeStorage, BlockListAsLongs> perVolumeBlockLists =
dn.getFSDataset().getBlockReports(bpos.getBlockPoolId());
// Convert the reports to the format expected by the NN.
int i = 0;
int totalBlockCount = 0;
StorageBlockReport reports[] =
new StorageBlockReport[perVolumeBlockLists.size()];
for(Map.Entry<DatanodeStorage, BlockListAsLongs> kvPair : perVolumeBlockLists.entrySet()) {
BlockListAsLongs blockList = kvPair.getValue();
reports[i++] = new StorageBlockReport(kvPair.getKey(), blockList);
totalBlockCount += blockList.getNumberOfBlocks();
}
// Send the reports to the NN.
int numReportsSent = 0;
int numRPCs = 0;
boolean success = false;
long brSendStartTime = monotonicNow();
long reportId = generateUniqueBlockReportId();
boolean useBlocksBuffer =
bpRegistration.getNamespaceInfo().isCapabilitySupported(
NamespaceInfo.Capability.STORAGE_BLOCK_REPORT_BUFFERS);
blockReportSizes.clear();
try {
if (totalBlockCount < dnConf.blockReportSplitThreshold) {
// Below split threshold, send all reports in a single message.
DatanodeCommand cmd = bpNamenode.blockReport(
bpRegistration, bpos.getBlockPoolId(), reports,
new BlockReportContext(1, 0, reportId, fullBrLeaseId));
blockReportSizes.add(
calculateBlockReportPBSize(useBlocksBuffer, reports));
numRPCs = 1;
numReportsSent = reports.length;
if (cmd != null) {
cmds.add(cmd);
}
} else {
// Send one block report per message.
for (int r = 0; r < reports.length; r++) {
StorageBlockReport singleReport[] = { reports[r] };
DatanodeCommand cmd = bpNamenode.blockReport(
bpRegistration, bpos.getBlockPoolId(), singleReport,
new BlockReportContext(reports.length, r, reportId,
fullBrLeaseId));
blockReportSizes.add(
calculateBlockReportPBSize(useBlocksBuffer, singleReport));
numReportsSent++;
numRPCs++;
if (cmd != null) {
cmds.add(cmd);
}
}
}
success = true;
} finally {
// Log the block report processing stats from Datanode perspective
long brSendCost = monotonicNow() - brSendStartTime;
long brCreateCost = brSendStartTime - brCreateStartTime;
dn.getMetrics().addBlockReportCreateCost(brCreateCost);
dn.getMetrics().addBlockReport(brSendCost, getRpcMetricSuffix());
final int nCmds = cmds.size();
LOG.info((success ? "S" : "Uns") +
"uccessfully sent block report 0x" + Long.toHexString(reportId) +
" with lease ID 0x" + Long.toHexString(fullBrLeaseId) + " to namenode: " + nnAddr +
", containing " + reports.length +
" storage report(s), of which we sent " + numReportsSent + "." +
" The reports had " + totalBlockCount +
" total blocks and used " + numRPCs +
" RPC(s). This took " + brCreateCost +
" msecs to generate and " + brSendCost +
" msecs for RPC and NN processing." +
" Got back " +
((nCmds == 0) ? "no commands" :
((nCmds == 1) ? "one command: " + cmds.get(0) :
(nCmds + " commands: " + Joiner.on("; ").join(cmds)))) +
".");
}
scheduler.updateLastBlockReportTime(monotonicNow());
scheduler.scheduleNextBlockReport();
return cmds.size() == 0 ? null : cmds;
}
private String getRpcMetricSuffix() {
if (serviceId == null && nnId == null) {
return null;
} else if (serviceId == null && nnId != null) {
return nnId;
} else if (serviceId != null && nnId == null) {
return serviceId;
} else {
return serviceId + "-" + nnId;
}
}
DatanodeCommand cacheReport() throws IOException {
// If caching is disabled, do not send a cache report
if (dn.getFSDataset().getCacheCapacity() == 0) {
return null;
}
// send cache report if timer has expired.
DatanodeCommand cmd = null;
final long startTime = monotonicNow();
if (startTime - lastCacheReport > dnConf.cacheReportInterval) {
if (LOG.isDebugEnabled()) {
LOG.debug("Sending cacheReport from service actor: " + this);
}
lastCacheReport = startTime;
String bpid = bpos.getBlockPoolId();
List<Long> blockIds = dn.getFSDataset().getCacheReport(bpid);
// Skip cache report
if (blockIds.isEmpty()) {
return null;
}
long createTime = monotonicNow();
cmd = bpNamenode.cacheReport(bpRegistration, bpid, blockIds);
long sendTime = monotonicNow();
long createCost = createTime - startTime;
long sendCost = sendTime - createTime;
dn.getMetrics().addCacheReport(sendCost);
if (LOG.isDebugEnabled()) {
LOG.debug("CacheReport of " + blockIds.size()
+ " block(s) took " + createCost + " msecs to generate and "
+ sendCost + " msecs for RPC and NN processing");
}
}
return cmd;
}
private int calculateBlockReportPBSize(
boolean useBlocksBuffer, StorageBlockReport[] reports) {
int reportSize = 0;
for (StorageBlockReport r : reports) {
if (useBlocksBuffer) {
reportSize += r.getBlocks().getBlocksBuffer().size();
} else {
// each block costs 10 bytes in PB because of uint64
reportSize += 10 * r.getBlocks().getBlockListAsLongs().length;
}
}
return reportSize;
}
HeartbeatResponse sendHeartBeat(boolean requestBlockReportLease)
throws IOException {
scheduler.scheduleNextHeartbeat();
StorageReport[] reports =
dn.getFSDataset().getStorageReports(bpos.getBlockPoolId());
if (LOG.isDebugEnabled()) {
LOG.debug("Sending heartbeat with " + reports.length +
" storage reports from service actor: " + this);
}
final long now = monotonicNow();
scheduler.updateLastHeartbeatTime(now);
VolumeFailureSummary volumeFailureSummary = dn.getFSDataset()
.getVolumeFailureSummary();
int numFailedVolumes = volumeFailureSummary != null ?
volumeFailureSummary.getFailedStorageLocations().length : 0;
final boolean outliersReportDue = scheduler.isOutliersReportDue(now);
final SlowPeerReports slowPeers =
outliersReportDue && dnConf.peerStatsEnabled && dn.getPeerMetrics() != null ?
SlowPeerReports.create(dn.getPeerMetrics().getOutliers()) :
SlowPeerReports.EMPTY_REPORT;
final SlowDiskReports slowDisks =
outliersReportDue && dnConf.diskStatsEnabled && dn.getDiskMetrics() != null ?
SlowDiskReports.create(dn.getDiskMetrics().getDiskOutliersStats()) :
SlowDiskReports.EMPTY_REPORT;
HeartbeatResponse response = bpNamenode.sendHeartbeat(bpRegistration,
reports,
dn.getFSDataset().getCacheCapacity(),
dn.getFSDataset().getCacheUsed(),
dn.getXmitsInProgress(),
dn.getActiveTransferThreadCount(),
numFailedVolumes,
volumeFailureSummary,
requestBlockReportLease,
slowPeers,
slowDisks);
scheduler.updateLastHeartbeatResponseTime(monotonicNow());
if (outliersReportDue) {
// If the report was due and successfully sent, schedule the next one.
scheduler.scheduleNextOutlierReport();
}
return response;
}
@VisibleForTesting
void sendLifelineForTests() throws IOException {
lifelineSender.sendLifeline();
}
//This must be called only by BPOfferService
void start() {
if ((bpThread != null) && (bpThread.isAlive())) {
//Thread is started already
return;
}
bpThread = new Thread(this);
bpThread.setDaemon(true); // needed for JUnit testing
if (lifelineSender != null) {
lifelineSender.start();
}
bpThread.start();
}
private String formatThreadName(
final String action,
final InetSocketAddress addr) {
String bpId = bpos.getBlockPoolId(true);
final String prefix = bpId != null ? bpId : bpos.getNameserviceId();
return prefix + " " + action + " to " + addr;
}
//This must be called only by blockPoolManager.
void stop() {
shouldServiceRun = false;
if (lifelineSender != null) {
lifelineSender.stop();
}
if (bpThread != null) {
bpThread.interrupt();
}
if (commandProcessingThread != null) {
commandProcessingThread.interrupt();
}
}
//This must be called only by blockPoolManager
void join() {
try {
if (lifelineSender != null) {
lifelineSender.join();
}
if (bpThread != null) {
bpThread.join();
}
} catch (InterruptedException ie) { }
}
//Cleanup method to be called by current thread before exiting.
private synchronized void cleanUp() {
shouldServiceRun = false;
IOUtils.cleanupWithLogger(null, bpNamenode);
IOUtils.cleanupWithLogger(null, lifelineSender);
bpos.shutdownActor(this);
}
private void handleRollingUpgradeStatus(HeartbeatResponse resp) throws IOException {
RollingUpgradeStatus rollingUpgradeStatus = resp.getRollingUpdateStatus();
if (rollingUpgradeStatus != null &&
rollingUpgradeStatus.getBlockPoolId().compareTo(bpos.getBlockPoolId()) != 0) {
// Can this ever occur?
LOG.error("Invalid BlockPoolId " +
rollingUpgradeStatus.getBlockPoolId() +
" in HeartbeatResponse. Expected " +
bpos.getBlockPoolId());
} else {
bpos.signalRollingUpgrade(rollingUpgradeStatus);
}
}
/**
* Main loop for each BP thread. Run until shutdown,
* forever calling remote NameNode functions.
*/
private void offerService() throws Exception {
LOG.info("For namenode " + nnAddr + " using"
+ " BLOCKREPORT_INTERVAL of " + dnConf.blockReportInterval + "msecs"
+ " CACHEREPORT_INTERVAL of " + dnConf.cacheReportInterval + "msecs"
+ " Initial delay: " + dnConf.initialBlockReportDelayMs + "msecs"
+ "; heartBeatInterval=" + dnConf.heartBeatInterval
+ (lifelineSender != null ?
"; lifelineIntervalMs=" + dnConf.getLifelineIntervalMs() : ""));
//
// Now loop for a long time....
//
while (shouldRun()) {
try {
DataNodeFaultInjector.get().startOfferService();
final long startTime = scheduler.monotonicNow();
//
// Every so often, send heartbeat or block-report
//
final boolean sendHeartbeat = scheduler.isHeartbeatDue(startTime);
LOG.debug("BP offer service run start time: {}, sendHeartbeat: {}", startTime,
sendHeartbeat);
HeartbeatResponse resp = null;
if (sendHeartbeat) {
//
// All heartbeat messages include following info:
// -- Datanode name
// -- data transfer port
// -- Total capacity
// -- Bytes remaining
//
boolean requestBlockReportLease = (fullBlockReportLeaseId == 0) &&
scheduler.isBlockReportDue(startTime);
if (!dn.areHeartbeatsDisabledForTests()) {
LOG.debug("Before sending heartbeat to namenode {}, the state of the namenode known"
+ " to datanode so far is {}", this.getNameNodeAddress(), state);
resp = sendHeartBeat(requestBlockReportLease);
assert resp != null;
if (resp.getFullBlockReportLeaseId() != 0) {
if (fullBlockReportLeaseId != 0) {
LOG.warn(nnAddr + " sent back a full block report lease " +
"ID of 0x" +
Long.toHexString(resp.getFullBlockReportLeaseId()) +
", but we already have a lease ID of 0x" +
Long.toHexString(fullBlockReportLeaseId) + ". " +
"Overwriting old lease ID.");
}
fullBlockReportLeaseId = resp.getFullBlockReportLeaseId();
}
dn.getMetrics().addHeartbeat(scheduler.monotonicNow() - startTime,
getRpcMetricSuffix());
// If the state of this NN has changed (eg STANDBY->ACTIVE)
// then let the BPOfferService update itself.
//
// Important that this happens before processCommand below,
// since the first heartbeat to a new active might have commands
// that we should actually process.
bpos.updateActorStatesFromHeartbeat(
this, resp.getNameNodeHaState());
HAServiceState stateFromResp = resp.getNameNodeHaState().getState();
if (state != stateFromResp) {
LOG.info("After receiving heartbeat response, updating state of namenode {} to {}",
this.getNameNodeAddress(), stateFromResp);
}
state = stateFromResp;
if (state == HAServiceState.ACTIVE) {
handleRollingUpgradeStatus(resp);
}
commandProcessingThread.enqueue(resp.getCommands());
isSlownode = resp.getIsSlownode();
}
}
if (!dn.areIBRDisabledForTests() &&
(ibrManager.sendImmediately()|| sendHeartbeat)) {
ibrManager.sendIBRs(bpNamenode, bpRegistration,
bpos.getBlockPoolId(), getRpcMetricSuffix());
}
List<DatanodeCommand> cmds = null;
boolean forceFullBr =
scheduler.forceFullBlockReport.getAndSet(false);
if (forceFullBr) {
LOG.info("Forcing a full block report to " + nnAddr);
}
if ((fullBlockReportLeaseId != 0) || forceFullBr) {
cmds = blockReport(fullBlockReportLeaseId);
fullBlockReportLeaseId = 0;
}
commandProcessingThread.enqueue(cmds);
if (!dn.areCacheReportsDisabledForTests()) {
DatanodeCommand cmd = cacheReport();
commandProcessingThread.enqueue(cmd);
}
if (sendHeartbeat) {
dn.getMetrics().addHeartbeatTotal(
scheduler.monotonicNow() - startTime, getRpcMetricSuffix());
}
// There is no work to do; sleep until hearbeat timer elapses,
// or work arrives, and then iterate again.
ibrManager.waitTillNextIBR(scheduler.getHeartbeatWaitTime());
} catch(RemoteException re) {
String reClass = re.getClassName();
if (UnregisteredNodeException.class.getName().equals(reClass) ||
DisallowedDatanodeException.class.getName().equals(reClass) ||
IncorrectVersionException.class.getName().equals(reClass)) {
LOG.warn(this + " is shutting down", re);
shouldServiceRun = false;
return;
}
if (InvalidBlockReportLeaseException.class.getName().equals(reClass)) {
fullBlockReportLeaseId = 0;
}
LOG.warn("RemoteException in offerService", re);
sleepAfterException();
} catch (IOException e) {
LOG.warn("IOException in offerService", e);
sleepAfterException();
} finally {
DataNodeFaultInjector.get().endOfferService();
}
processQueueMessages();
} // while (shouldRun())
} // offerService
private void sleepAfterException() {
try {
long sleepTime = Math.min(1000, dnConf.heartBeatInterval);
Thread.sleep(sleepTime);
} catch (InterruptedException ie) {
LOG.info("BPServiceActor {} is interrupted", this);
Thread.currentThread().interrupt();
}
}
/**
* Register one bp with the corresponding NameNode
* <p>
* The bpDatanode needs to register with the namenode on startup in order
* 1) to report which storage it is serving now and
* 2) to receive a registrationID
*
* issued by the namenode to recognize registered datanodes.
*
* @param nsInfo current NamespaceInfo
* @see FSNamesystem#registerDatanode(DatanodeRegistration)
* @throws IOException
*/
void register(NamespaceInfo nsInfo) throws IOException {
// The handshake() phase loaded the block pool storage
// off disk - so update the bpRegistration object from that info
DatanodeRegistration newBpRegistration = bpos.createRegistration();
LOG.info("{} beginning handshake with NN: {}.", this, nnAddr);
while (shouldRun()) {
try {
// Use returned registration from namenode with updated fields
newBpRegistration = bpNamenode.registerDatanode(newBpRegistration);
newBpRegistration.setNamespaceInfo(nsInfo);
bpRegistration = newBpRegistration;
break;
} catch(EOFException e) { // namenode might have just restarted
LOG.info("Problem connecting to server: {} : {}.", nnAddr, e.getLocalizedMessage());
} catch(SocketTimeoutException e) { // namenode is busy
LOG.info("Problem connecting to server: {}.", nnAddr);
} catch(RemoteException e) {
LOG.warn("RemoteException in register to server: {}.", nnAddr, e);
throw e;
} catch(IOException e) {
LOG.warn("Problem connecting to server: {}.", nnAddr);
}
// Try again in a second
sleepAndLogInterrupts(1000, "connecting to server");
}
if (bpRegistration == null) {
throw new IOException("DN shut down before block pool registered");
}
LOG.info("{} successfully registered with NN: {}.", this, nnAddr);
bpos.registrationSucceeded(this, bpRegistration);
// reset lease id whenever registered to NN.
// ask for a new lease id at the next heartbeat.
fullBlockReportLeaseId = 0;
// random short delay - helps scatter the BR from all DNs
scheduler.scheduleBlockReport(dnConf.initialBlockReportDelayMs, true);
}
private void sleepAndLogInterrupts(int millis,
String stateString) {
try {
Thread.sleep(millis);
} catch (InterruptedException ie) {
LOG.info("BPOfferService " + this + " interrupted while " + stateString);
}
}
/**
* No matter what kind of exception we get, keep retrying to offerService().
* That's the loop that connects to the NameNode and provides basic DataNode
* functionality.
*
* Only stop when "shouldRun" or "shouldServiceRun" is turned off, which can
* happen either at shutdown or due to refreshNamenodes.
*/
@Override
public void run() {
LOG.info(this + " starting to offer service");
try {
while (true) {
// init stuff
try {
// setup storage
connectToNNAndHandshake();
break;
} catch (IOException ioe) {
// Initial handshake, storage recovery or registration failed
runningState = RunningState.INIT_FAILED;
if (shouldRetryInit()) {
// Retry until all namenode's of BPOS failed initialization
LOG.error("Initialization failed for " + this + " "
+ ioe.getLocalizedMessage());
sleepAndLogInterrupts(5000, "initializing");
} else {
runningState = RunningState.FAILED;
LOG.error("Initialization failed for " + this + ". Exiting. ", ioe);
return;
}
}
}
runningState = RunningState.RUNNING;
if (initialRegistrationComplete != null) {
initialRegistrationComplete.countDown();
}
while (shouldRun()) {
try {
offerService();
} catch (Exception ex) {
LOG.error("Exception in BPOfferService for " + this, ex);
sleepAndLogInterrupts(5000, "offering service");
}
}
runningState = RunningState.EXITED;
} catch (Throwable ex) {
LOG.warn("Unexpected exception in block pool " + this, ex);
runningState = RunningState.FAILED;
} finally {
LOG.warn("Ending block pool service for: " + this);
cleanUp();
}
}
private boolean shouldRetryInit() {
return shouldRun() && bpos.shouldRetryInit();
}
private boolean shouldRun() {
return shouldServiceRun && dn.shouldRun();
}
/**
* Report a bad block from another DN in this cluster.
*/
void reportRemoteBadBlock(DatanodeInfo dnInfo, ExtendedBlock block)
throws IOException {
LocatedBlock lb = new LocatedBlock(block,
new DatanodeInfo[] {dnInfo});
bpNamenode.reportBadBlocks(new LocatedBlock[] {lb});
}
void reRegister() throws IOException {
if (shouldRun()) {
// re-retrieve namespace info to make sure that, if the NN
// was restarted, we still match its version (HDFS-2120)
NamespaceInfo nsInfo = retrieveNamespaceInfo();
// HDFS-9917,Standby NN IBR can be very huge if standby namenode is down
// for sometime.
if (state == HAServiceState.STANDBY || state == HAServiceState.OBSERVER) {
ibrManager.clearIBRs();
}
// HDFS-15113, register and trigger FBR after clean IBR to avoid missing
// some blocks report to Standby util next FBR.
// and re-register
register(nsInfo);
scheduler.scheduleHeartbeat();
DataNodeFaultInjector.get().blockUtilSendFullBlockReport();
}
}
void triggerBlockReport(BlockReportOptions options) {
if (options.isIncremental()) {
LOG.info(bpos.toString() + ": scheduling an incremental block report " +
"to namenode: " + nnAddr + ".");
ibrManager.triggerIBR(true);
} else {
LOG.info(bpos.toString() + ": scheduling a full block report " +
"to namenode: " + nnAddr + ".");
synchronized(ibrManager) {
scheduler.forceFullBlockReportNow();
ibrManager.notifyAll();
}
}
}
public void bpThreadEnqueue(BPServiceActorAction action) {
synchronized (bpThreadQueue) {
if (!bpThreadQueue.contains(action)) {
bpThreadQueue.add(action);
}
}
}
private void processQueueMessages() {
LinkedList<BPServiceActorAction> duplicateQueue;
synchronized (bpThreadQueue) {
duplicateQueue = new LinkedList<BPServiceActorAction>(bpThreadQueue);
bpThreadQueue.clear();
}
while (!duplicateQueue.isEmpty()) {
BPServiceActorAction actionItem = duplicateQueue.remove();
try {
LOG.debug("BPServiceActor ( {} ) processing queued messages. Action item: {}", this,
actionItem);
actionItem.reportTo(bpNamenode, bpRegistration);
} catch (BPServiceActorActionException baae) {
LOG.warn(baae.getMessage() + nnAddr , baae);
// Adding it back to the queue if not present
bpThreadEnqueue(actionItem);
}
}
}
Scheduler getScheduler() {
return scheduler;
}
private final class LifelineSender implements Runnable, Closeable {
private final InetSocketAddress lifelineNnAddr;
private Thread lifelineThread;
private DatanodeLifelineProtocolClientSideTranslatorPB lifelineNamenode;
public LifelineSender(InetSocketAddress lifelineNnAddr) {
this.lifelineNnAddr = lifelineNnAddr;
}
@Override
public void close() {
stop();
try {
join();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
IOUtils.cleanupWithLogger(null, lifelineNamenode);
}
@Override
public void run() {
// The lifeline RPC depends on registration with the NameNode, so wait for
// initial registration to complete.
while (shouldRun()) {
try {
initialRegistrationComplete.await();
break;
} catch (InterruptedException e) {
// The only way thread interruption can happen while waiting on this
// latch is if the state of the actor has been updated to signal
// shutdown. The next loop's call to shouldRun() will return false,
// and the thread will finish.
Thread.currentThread().interrupt();
}
}
// After initial NameNode registration has completed, execute the main
// loop for sending periodic lifeline RPCs if needed. This is done in a
// second loop to avoid a pointless wait on the above latch in every
// iteration of the main loop.
while (shouldRun()) {
try {
if (lifelineNamenode == null) {
lifelineNamenode = dn.connectToLifelineNN(lifelineNnAddr);
}
sendLifelineIfDue();
Thread.sleep(scheduler.getLifelineWaitTime());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (IOException e) {
LOG.warn("IOException in LifelineSender for " + BPServiceActor.this,
e);
}
}
LOG.info("LifelineSender for " + BPServiceActor.this + " exiting.");
}
public void start() {
lifelineThread = new Thread(this,
formatThreadName("lifeline", lifelineNnAddr));
lifelineThread.setDaemon(true);
lifelineThread.setUncaughtExceptionHandler(
new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread thread, Throwable t) {
LOG.error(thread + " terminating on unexpected exception", t);
}
});
lifelineThread.start();
}
public void stop() {
if (lifelineThread != null) {
lifelineThread.interrupt();
}
}
public void join() throws InterruptedException {
if (lifelineThread != null) {
lifelineThread.join();
}
}
private void sendLifelineIfDue() throws IOException {
long startTime = scheduler.monotonicNow();
if (!scheduler.isLifelineDue(startTime)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Skipping sending lifeline for " + BPServiceActor.this
+ ", because it is not due.");
}
return;
}
if (dn.areHeartbeatsDisabledForTests()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Skipping sending lifeline for " + BPServiceActor.this
+ ", because heartbeats are disabled for tests.");
}
return;
}
sendLifeline();
dn.getMetrics().addLifeline(scheduler.monotonicNow() - startTime,
getRpcMetricSuffix());
scheduler.scheduleNextLifeline(scheduler.monotonicNow());
}
private void sendLifeline() throws IOException {
StorageReport[] reports =
dn.getFSDataset().getStorageReports(bpos.getBlockPoolId());
if (LOG.isDebugEnabled()) {
LOG.debug("Sending lifeline with " + reports.length + " storage " +
" reports from service actor: " + BPServiceActor.this);
}
VolumeFailureSummary volumeFailureSummary = dn.getFSDataset()
.getVolumeFailureSummary();
int numFailedVolumes = volumeFailureSummary != null ?
volumeFailureSummary.getFailedStorageLocations().length : 0;
lifelineNamenode.sendLifeline(bpRegistration,
reports,
dn.getFSDataset().getCacheCapacity(),
dn.getFSDataset().getCacheUsed(),
dn.getXmitsInProgress(),
dn.getXceiverCount(),
numFailedVolumes,
volumeFailureSummary);
}
}
/**
* Utility class that wraps the timestamp computations for scheduling
* heartbeats and block reports.
*/
static class Scheduler {
// nextBlockReportTime and nextHeartbeatTime may be assigned/read
// by testing threads (through BPServiceActor#triggerXXX), while also
// assigned/read by the actor thread.
private final AtomicLong nextBlockReportTime =
new AtomicLong(monotonicNow());
@VisibleForTesting
volatile long nextHeartbeatTime = monotonicNow();
@VisibleForTesting
volatile long nextLifelineTime;
@VisibleForTesting
volatile long lastBlockReportTime = monotonicNow();
@VisibleForTesting
volatile long lastHeartbeatTime = monotonicNow();
@VisibleForTesting
private volatile long lastHeartbeatResponseTime = -1;
@VisibleForTesting
boolean resetBlockReportTime = true;
@VisibleForTesting
volatile long nextOutliersReportTime = monotonicNow();
private final AtomicBoolean forceFullBlockReport =
new AtomicBoolean(false);
private final long heartbeatIntervalMs;
private final long lifelineIntervalMs;
private volatile long blockReportIntervalMs;
private volatile long outliersReportIntervalMs;
Scheduler(long heartbeatIntervalMs, long lifelineIntervalMs,
long blockReportIntervalMs, long outliersReportIntervalMs) {
this.heartbeatIntervalMs = heartbeatIntervalMs;
this.lifelineIntervalMs = lifelineIntervalMs;
this.blockReportIntervalMs = blockReportIntervalMs;
this.outliersReportIntervalMs = outliersReportIntervalMs;
scheduleNextLifeline(nextHeartbeatTime);
}
// This is useful to make sure NN gets Heartbeat before Blockreport
// upon NN restart while DN keeps retrying Otherwise,
// 1. NN restarts.
// 2. Heartbeat RPC will retry and succeed. NN asks DN to reregister.
// 3. After reregistration completes, DN will send Blockreport first.
// 4. Given NN receives Blockreport after Heartbeat, it won't mark
// DatanodeStorageInfo#blockContentsStale to false until the next
// Blockreport.
long scheduleHeartbeat() {
nextHeartbeatTime = monotonicNow();
scheduleNextLifeline(nextHeartbeatTime);
return nextHeartbeatTime;
}
long scheduleNextHeartbeat() {
// Numerical overflow is possible here and is okay.
nextHeartbeatTime = monotonicNow() + heartbeatIntervalMs;
scheduleNextLifeline(nextHeartbeatTime);
return nextHeartbeatTime;
}
void updateLastHeartbeatTime(long heartbeatTime) {
lastHeartbeatTime = heartbeatTime;
}
void updateLastHeartbeatResponseTime(long heartbeatTime) {
this.lastHeartbeatResponseTime = heartbeatTime;
}
void updateLastBlockReportTime(long blockReportTime) {
lastBlockReportTime = blockReportTime;
}
void scheduleNextOutlierReport() {
nextOutliersReportTime = monotonicNow() + outliersReportIntervalMs;
}
long getLastHearbeatTime() {
return (monotonicNow() - lastHeartbeatTime)/1000;
}
private long getLastHeartbeatResponseTime() {
return (monotonicNow() - lastHeartbeatResponseTime) / 1000;
}
long getLastBlockReportTime() {
return (monotonicNow() - lastBlockReportTime)/1000;
}
long scheduleNextLifeline(long baseTime) {
// Numerical overflow is possible here and is okay.
nextLifelineTime = baseTime + lifelineIntervalMs;
return nextLifelineTime;
}
boolean isHeartbeatDue(long startTime) {
return (nextHeartbeatTime - startTime <= 0);
}
boolean isLifelineDue(long startTime) {
return (nextLifelineTime - startTime <= 0);
}
boolean isBlockReportDue(long curTime) {
return nextBlockReportTime.get() - curTime <= 0;
}
boolean isOutliersReportDue(long curTime) {
return nextOutliersReportTime - curTime <= 0;
}
void forceFullBlockReportNow() {
forceFullBlockReport.set(true);
resetBlockReportTime = true;
}
/**
* This methods arranges for the data node to send the block report at
* the next heartbeat.
* @param delay specifies the maximum amount of random delay(in
* milliseconds) in sending the block report. A value of 0
* or less makes the BR to go right away without any delay.
* @param isRegistration if true, resets the future BRs for randomness,
* post first BR to avoid regular BRs from all DN's
* coming at one time.
*/
long scheduleBlockReport(long delay, boolean isRegistration) {
if (delay > 0) { // send BR after random delay
// Numerical overflow is possible here and is okay.
nextBlockReportTime.getAndSet(
monotonicNow() + ThreadLocalRandom.current().nextInt((int) (delay)));
} else { // send at next heartbeat
nextBlockReportTime.getAndSet(monotonicNow());
}
resetBlockReportTime = isRegistration; // reset future BRs for
// randomness, post first block report to avoid regular BRs from all
// DN's coming at one time.
return nextBlockReportTime.get();
}
/**
* Schedule the next block report after the block report interval. If the
* current block report was delayed then the next block report is sent per
* the original schedule.
* Numerical overflow is possible here.
*/
void scheduleNextBlockReport() {
// If we have sent the first set of block reports, then wait a random
// time before we start the periodic block reports.
if (resetBlockReportTime) {
nextBlockReportTime.getAndSet(monotonicNow() +
ThreadLocalRandom.current().nextInt((int) (blockReportIntervalMs)));
resetBlockReportTime = false;
} else {
/* say the last block report was at 8:20:14. The current report
* should have started around 14:20:14 (default 6 hour interval).
* If current time is :
* 1) normal like 14:20:18, next report should be at 20:20:14.
* 2) unexpected like 21:35:43, next report should be at 2:20:14
* on the next day.
*/
long factor = (monotonicNow() - nextBlockReportTime.get()
+ blockReportIntervalMs) / blockReportIntervalMs;
if (factor != 0) {
nextBlockReportTime.getAndAdd(factor * blockReportIntervalMs);
} else {
// If the difference between the present time and the scheduled
// time is very less, the factor can be 0, so in that case, we can
// ignore that negligible time, spent while sending the BRss and
// schedule the next BR after the blockReportInterval.
nextBlockReportTime.getAndAdd(blockReportIntervalMs);
}
}
}
long getHeartbeatWaitTime() {
return nextHeartbeatTime - monotonicNow();
}
long getLifelineWaitTime() {
long waitTime = nextLifelineTime - monotonicNow();
return waitTime > 0 ? waitTime : 0;
}
@VisibleForTesting
long getNextBlockReportTime() {
return nextBlockReportTime.get();
}
@VisibleForTesting
void setNextBlockReportTime(long nextBlockReportTime) {
this.nextBlockReportTime.getAndSet(nextBlockReportTime);
}
long getBlockReportIntervalMs() {
return this.blockReportIntervalMs;
}
void setBlockReportIntervalMs(long intervalMs) {
Preconditions.checkArgument(intervalMs > 0,
DFS_BLOCKREPORT_INTERVAL_MSEC_KEY + " should be larger than 0");
this.blockReportIntervalMs = intervalMs;
}
void setOutliersReportIntervalMs(long intervalMs) {
Preconditions.checkArgument(intervalMs > 0,
DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY + " should be larger than 0");
this.outliersReportIntervalMs = intervalMs;
}
@VisibleForTesting
long getOutliersReportIntervalMs() {
return this.outliersReportIntervalMs;
}
/**
* Wrapped for testing.
* @return
*/
@VisibleForTesting
public long monotonicNow() {
return Time.monotonicNow();
}
}
/**
* CommandProcessingThread that process commands asynchronously.
*/
class CommandProcessingThread extends Thread {
private final BPServiceActor actor;
private final BlockingQueue<Runnable> queue;
CommandProcessingThread(BPServiceActor actor) {
super("Command processor");
this.actor = actor;
this.queue = new LinkedBlockingQueue<>();
setDaemon(true);
}
@Override
public void run() {
try {
processQueue();
} catch (Throwable t) {
LOG.error("{} encountered fatal exception and exit.", getName(), t);
runningState = RunningState.FAILED;
} finally {
LOG.warn("Ending command processor service for: " + this);
shouldServiceRun = false;
}
}
/**
* Process commands in queue one by one, and wait until queue not empty.
*/
private void processQueue() {
while (shouldRun()) {
try {
Runnable action = queue.take();
action.run();
dn.getMetrics().incrActorCmdQueueLength(-1);
dn.getMetrics().incrNumProcessedCommands();
} catch (InterruptedException e) {
LOG.error("{} encountered interrupt and exit.", getName());
Thread.currentThread().interrupt();
// ignore unless thread was specifically interrupted.
if (Thread.interrupted()) {
break;
}
}
}
dn.getMetrics().incrActorCmdQueueLength(-1 * queue.size());
queue.clear();
}
/**
* Process an array of datanode commands.
*
* @param cmds an array of datanode commands
* @return true if further processing may be required or false otherwise.
*/
private boolean processCommand(DatanodeCommand[] cmds) {
if (cmds != null) {
long startProcessCommands = monotonicNow();
for (DatanodeCommand cmd : cmds) {
try {
if (!bpos.processCommandFromActor(cmd, actor)) {
return false;
}
} catch (RemoteException re) {
String reClass = re.getClassName();
if (UnregisteredNodeException.class.getName().equals(reClass) ||
DisallowedDatanodeException.class.getName().equals(reClass) ||
IncorrectVersionException.class.getName().equals(reClass)) {
LOG.warn("{} is shutting down", this, re);
shouldServiceRun = false;
return false;
}
} catch (IOException ioe) {
LOG.warn("Error processing datanode Command", ioe);
}
}
long processCommandsMs = monotonicNow() - startProcessCommands;
if (cmds.length > 0) {
dn.getMetrics().addNumProcessedCommands(processCommandsMs);
}
if (processCommandsMs > dnConf.getProcessCommandsThresholdMs()) {
LOG.warn("Took {} ms to process {} commands from NN",
processCommandsMs, cmds.length);
}
}
return true;
}
void enqueue(DatanodeCommand cmd) throws InterruptedException {
if (cmd == null) {
return;
}
queue.put(() -> processCommand(new DatanodeCommand[]{cmd}));
dn.getMetrics().incrActorCmdQueueLength(1);
}
void enqueue(List<DatanodeCommand> cmds) throws InterruptedException {
if (cmds == null) {
return;
}
queue.put(() -> processCommand(
cmds.toArray(new DatanodeCommand[cmds.size()])));
dn.getMetrics().incrActorCmdQueueLength(1);
}
void enqueue(DatanodeCommand[] cmds) throws InterruptedException {
if (cmds.length != 0) {
queue.put(() -> processCommand(cmds));
dn.getMetrics().incrActorCmdQueueLength(1);
}
}
}
@VisibleForTesting
void stopCommandProcessingThread() {
if (commandProcessingThread != null) {
commandProcessingThread.interrupt();
}
}
boolean isSlownode() {
return isSlownode;
}
}