HDFS---triggerBlockReport

当前有两种方式触发全量块汇报

通过命令行

./bin/hdfs dfsadmin -triggerBlockReport dnIp:50020

通过hdfs.site.xml参数控制


  dfs.blockreport.intervalMsec
    600000
      Determines block reporting interval in milliseconds.

全量块汇报

datanode---BPServiceActor

List blockReport(long fullBrLeaseId) throws IOException {
	LOG.info("Trigger a full block report to " + nnAddr);
	final ArrayList cmds = new ArrayList();
	// 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(), dn.getMetrics());
	long brCreateStartTime = monotonicNow();
	Map 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 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();
	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, true));
			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, true));
				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().addBlockReport(brSendCost);
		if (!success) {
			dn.getMetrics().incrBlockReportFailedNumOps();
		} else {
			scheduler.lastBlockReportTime = Time.monotonicNow();
		}
		if (scheduler.isFirstBlockReport) {
			synchronized (bpos) {
				if (dn.getFirstBlockReportLatency() != null &&
				              dn.getFirstBlockReportLatency().get(bpos.bpNSInfo.getBlockPoolID()) == null) {
					dn.getFirstBlockReportLatency().put(
					                bpos.bpNSInfo.getBlockPoolID(), new HashMap());
					dn.getFirstBlockReportLatency().get(bpos.bpNSInfo.getBlockPoolID())
					                .put(nnAddr.toString(), monotonicNow() - actorStartTime);
				}
			}
			dn.getMetrics().addBlockReportsStartComplete(monotonicNow() - actorStartTime);
			scheduler.isFirstBlockReport = false;
		}
		final int nCmds = cmds.size();
		LOG.info((success ? "S" : "Uns") +
		          "uccessfully sent block report 0x" +
		          long.toHexString(reportId) + ",  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 +
		          " msec 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.scheduleNextBlockReport();
	return cmds.size() == 0 ? null : cmds;
}

全量块汇报的触发都是在BPService中的offerService.java中完成的

if(dnConf.requestBPLease) {
	if ((fullBlockReportLeaseId != 0) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
} else {
	if (scheduler.isBlockReportDue(startTime) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
}

手动触发全量块汇报

手动命令行触发

} else if ("-triggerBlockReport".equals(cmd)) {
        exitCode = triggerBlockReport(argv);

DFSAdmin.java

public int triggerBlockReport(String[] argv) throws IOException {
	List args = new linkedList();
	for (int j = 1; j < argv.length; j++) {
		args.add(argv[j]);
	}
	Boolean incremental = StringUtils.popOption("-incremental", args);
	String hostPort = StringUtils.popFirstNonOption(args);
	if (hostPort == null) {
		System.err.println("You must specify a host:port pair.");
		return 1;
	}
	if (!args.isEmpty()) {
		System.err.print("Can't understand arguments: " +
		        Joiner.on(" ").join(args) + "n");
      return 1;
    }
    ClientDatanodeProtocol dnProxy = getDataNodeProxy(hostPort);
    try {
      dnProxy.triggerBlockReport(
          new BlockReportOptions.Factory().
              setIncremental(incremental).
              build());
    } catch (IOException e) {
      System.err.println("triggerBlockReport error: " + e);
      return 1;
    }
    System.out.println("Triggering " +
        (incremental ? "an incremental " : "a full ") +
        "block report on " + hostPort + ".");
    return 0;
  }

Datanode.java

@Override // ClientDatanodeProtocol
public void triggerBlockReport(BlockReportOptions options)
      throws IOException {
	checkSuperuserPrivilege();
	for (BPOfferService bpos : blockPoolManager.getAllNamenodeThreads()) {
		if (bpos != null) {
			for (BPServiceActor actor : bpos.getBPServiceActors()) {
				actor.triggerBlockReport(options);
			}
		}
	}
}

BPService.java

强制触发全量块汇报（FBR）

void triggerBlockReport(BlockReportOptions options) {
	if (options.isIncremental()) {
		LOG.info(bpos.toString() + ": scheduling an incremental block report.");
		ibrManager.triggerIBR(true);
	} else {
		LOG.info(bpos.toString() + ": scheduling a full block report.");
		synchronized(ibrManager) {
			scheduler.forceFullBlockReportNow();
			ibrManager.notifyAll();
		}
	}
}

void forceFullBlockReportNow() {
    forceFullBlockReport.set(true);
    resetBlockReportTime = true;
}

判断是否需要全量FBR

boolean forceFullBr = scheduler.forceFullBlockReport.getAndSet(false);

回到刚刚的offerService.java

if(dnConf.requestBPLease) {
    // 走forceFullBr == true的逻辑
	if ((fullBlockReportLeaseId != 0) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
} else {
	if (scheduler.isBlockReportDue(startTime) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
}

间隔6小时自动触发

在DNConf中会读取全量块汇报的间隔配置

this.blockReportInterval = conf.getLong(DFS_BLOCKREPORT_INTERVAL_MSEC_KEY,
        DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT);

BPServiceActor

**
   * 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 + "msec"
	        + " CACHEREPORT_INTERVAL of " + dnConf.cacheReportInterval + "msec"
	        + " Initial delay: " + dnConf.initialBlockReportDelayMs + "msec"
	        + "; heartBeatInterval=" + dnConf.heartBeatInterval
	        + (lifelineSender != null ?
	            "; lifelineIntervalMs=" + dnConf.getLifelineIntervalMs() : ""));
	long fullBlockReportLeaseId = 0;
	//
	// Now loop for a long time....
	//
	while (shouldRun()) {
		try {
			final long startTime = scheduler.monotonicNow();
			//
			// Every so often, send heartbeat or block-report
			//
			final Boolean sendHeartbeat = scheduler.isHeartbeatDue(startTime);
			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()) {
					try {
						dn.getMetrics().addHeartbeatInterval(scheduler.getHeartbeatInterval());
						resp = sendHeartBeat(requestBlockReportLease);
						scheduler.setLastHeartbeatTime();
					}
					catch (IOException e) {
						dn.getMetrics().incrFailedHeartBeatsINumOps();
						throw e;
					}
					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);
					// 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());
					state = resp.getNameNodeHaState().getState();
					if (state == HAServiceState.ACTIVE) {
						handleRollingUpgradeStatus(resp);
					}
					long startProcessCommands = monotonicNow();
					if (dnProcessCmdAsynchronouslyEnabled) {
						commandProcessingThread.enqueue(resp.getCommands());
					} else {
						if (!processCommand(resp.getCommands()))
						                continue;
					}
					long endProcessCommands = monotonicNow();
					if (endProcessCommands - startProcessCommands > 2000) {
						LOG.info("Took " + (endProcessCommands - startProcessCommands)
						                  + "ms to process " + resp.getCommands().length
						                  + " commands from NN");
					}
				}
			}
			if (ibrManager.sendImmediately() || sendHeartbeat) {
				ibrManager.sendIBRs(bpNamenode, bpRegistration,
				              bpos.getBlockPoolId(), dn.getMetrics());
			}
			List cmds = null;
			Boolean forceFullBr =
			            scheduler.forceFullBlockReport.getAndSet(false);
			if (forceFullBr) {
				LOG.info("Forcing a full block report to " + nnAddr);
			}
			if(dnConf.requestBPLease) {
				if ((fullBlockReportLeaseId != 0) || forceFullBr) {
					cmds = blockReport(fullBlockReportLeaseId);
					fullBlockReportLeaseId = 0;
				}
			} else {
				if (scheduler.isBlockReportDue(startTime) || forceFullBr) {
					cmds = blockReport(fullBlockReportLeaseId);
					fullBlockReportLeaseId = 0;
				}
			}
			if (dnProcessCmdAsynchronouslyEnabled) {
				commandProcessingThread.enqueue(cmds);
			} else {
				processCommand(cmds == null ? null : cmds.toArray(new DatanodeCommand[cmds.size()]));
			}
			if (!dn.areCacheReportsDisabledForTests()) {
				DatanodeCommand cmd = cacheReport();
				if (dnProcessCmdAsynchronouslyEnabled) {
					commandProcessingThread.enqueue(cmd);
				} else {
					processCommand(new DatanodeCommand[]{
						cmd
					}
					);
				}
			}
			// 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;
			}
			LOG.warn("RemoteException in offerService", re);
			sleepAfterException();
		}
		catch (IOException e) {
			LOG.warn("IOException in offerService", e);
			sleepAfterException();
		}
		finally {
			// 记录长时间没进行全量汇报的Metric
			if (Time.monotonicNow() - scheduler.lastBlockReportTime >
			            (dnConf.blockReportInterval + TimeUnit.HOURS.toMillis(1))) {
				dn.getMetrics().incrStaleBlockReportNumOps();
			}
		}
		processQueueMessages();
	}
	// while (shouldRun())
}
// offerService

还是这一段

if(dnConf.requestBPLease) {
	if ((fullBlockReportLeaseId != 0) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
} else {
    // 走配置定时触发
	if (scheduler.isBlockReportDue(startTime) || forceFullBr) {
		cmds = blockReport(fullBlockReportLeaseId);
		fullBlockReportLeaseId = 0;
	}
}

判断下一次的全量块汇报的时间比当前时间小（早），说明该开始全量块汇报了

Boolean isBlockReportDue(long curTime) {
	return nextBlockReportTime - curTime <= 0;
}

计算nextBlockReportTime（每次blockReport都会计算下一次要report的时间）

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 = monotonicNow() +
		            DFSUtil.getRandom().nextint((int)(blockReportIntervalMs));
		resetBlockReportTime = false;
	} else {
		
		nextBlockReportTime +=
		              (((monotonicNow() - nextBlockReportTime + blockReportIntervalMs) /
		                  blockReportIntervalMs)) * blockReportIntervalMs;
	}
}

初始化Schedule的时候会赋值配置文件里的或者默认值

DFSConfigKeys.java

public static final String DFS_BLOCKREPORT_INTERVAL_MSEC_KEY = "dfs.blockreport.intervalMsec";
public static final long DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT = 6 * 60 * 60 * 1000;

Scheduler(long heartbeatIntervalMs, long lifelineIntervalMs,
        long blockReportIntervalMs) {
	this.heartbeatIntervalMs = heartbeatIntervalMs;
	this.lifelineIntervalMs = lifelineIntervalMs;
	this.blockReportIntervalMs = blockReportIntervalMs;
}

scheduler = new Scheduler(dnConf.heartBeatInterval,
        dnConf.getLifelineIntervalMs(), dnConf.blockReportInterval);

this.blockReportInterval = conf.getLong(DFS_BLOCKREPORT_INTERVAL_MSEC_KEY,
        DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT);

HDFS---triggerBlockReport

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