dn心跳-临时

https://blog.youkuaiyun.com/Androidlushangderen/article/details/47945597

心跳逻辑

BPServiceActor

时间太长如：
2020-03-26 18:07:55,372 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Took 5675ms to process 1 commands from NN

---

2020-03-26 18:07:55,372 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Took 5675ms to process 1 commands from NN
2020-03-26 18:07:55,382 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: BlockRecoveryWorker: NameNode at bigdata-us-hdpnn11.us01/10.15.62.52:8021 calls
recoverBlock(BP-1629871299-10.15.62.52-1523963075824:blk_4791946168_3725472211, targets=[DatanodeInfoWithStorage[10.15.67.28:50010,null,null], DatanodeInfoWit
hStorage[10.15.67.25:50010,null,null], DatanodeInfoWithStorage[10.15.36.51:50010,null,null]], newGenerationStamp=0, newBlock=null, isStriped=false)
2020-03-26 18:07:55,387 WARN org.apache.hadoop.hdfs.server.protocol.InterDatanodeProtocol: Failed to recover block (block=BP-1629871299-10.15.62.52-1523963075
824:blk_4791946168_3725472211, datanode=DatanodeInfoWithStorage[10.15.67.28:50010,null,null])
java.io.IOException: THIS IS NOT SUPPOSED TO HAPPEN: replica.getGenerationStamp() >= recoveryId = 0, block=blk_4791946168_3725472211, replica=FinalizedReplica
, blk_4791946168_3725472211, FINALIZED
  getNumBytes()     = 553812
  getBytesOnDisk()  = 553812
  getVisibleLength()= 553812
  getVolume()       = /data6/hadoopdata/dfs
  getBlockURI()     = file:/data6/hadoopdata/dfs/current/BP-1629871299-10.15.62.52-1523963075824/current/finalized/subdir31/subdir11/blk_4791946168
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecoveryImpl(FsDatasetImpl.java:2623)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2576)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2565)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initReplicaRecovery(DataNode.java:3024)
        at org.apache.hadoop.hdfs.protocolPB.InterDatanodeProtocolServerSideTranslatorPB.initReplicaRecovery(InterDatanodeProtocolServerSideTranslatorPB.java:
55)
        at org.apache.hadoop.hdfs.protocol.proto.InterDatanodeProtocolProtos$InterDatanodeProtocolService$2.callBlockingMethod(InterDatanodeProtocolProtos.jav
a:3105)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:882)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:828)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1903)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2709)

        at sun.reflect.GeneratedConstructorAccessor75.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:121)
        at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:110)
        at org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker.callInitReplicaRecovery(BlockRecoveryWorker.java:567)
        at org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker.access$400(BlockRecoveryWorker.java:57)
        at org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker$RecoveryTaskContiguous.recover(BlockRecoveryWorker.java:134)
        at org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker$1.run(BlockRecoveryWorker.java:604)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.hadoop.ipc.RemoteException(java.io.IOException): THIS IS NOT SUPPOSED TO HAPPEN: replica.getGenerationStamp() >= recoveryId = 0, block=blk_4791946168_3725472211, replica=FinalizedReplica, blk_4791946168_3725472211, FINALIZED
  getNumBytes()     = 553812
  getBytesOnDisk()  = 553812
  getVisibleLength()= 553812
  getVolume()       = /data6/hadoopdata/dfs
  getBlockURI()     = file:/data6/hadoopdata/dfs/current/BP-1629871299-10.15.62.52-1523963075824/current/finalized/subdir31/subdir11/blk_4791946168
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecoveryImpl(FsDatasetImpl.java:2623)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2576)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2565)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initReplicaRecovery(DataNode.java:3024)
        at org.apache.hadoop.hdfs.protocolPB.InterDatanodeProtocolServerSideTranslatorPB.initReplicaRecovery(InterDatanodeProtocolServerSideTranslatorPB.java:55)
        at org.apache.hadoop.hdfs.protocol.proto.InterDatanodeProtocolProtos$InterDatanodeProtocolService$2.callBlockingMethod(InterDatanodeProtocolProtos.java:3105)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:882)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:828)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1903)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2709)

        at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1511)
        at org.apache.hadoop.ipc.Client.call(Client.java:1457)
        at org.apache.hadoop.ipc.Client.call(Client.java:1367)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
        at com.sun.proxy.$Proxy24.initReplicaRecovery(Unknown Source)
        at org.apache.hadoop.hdfs.protocolPB.InterDatanodeProtocolTranslatorPB.initReplicaRecovery(InterDatanodeProtocolTranslatorPB.java:83)
        at org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker.callInitReplicaRecovery(BlockRecoveryWorker.java:565)
                ... 4 more
2020-03-26 18:07:55,392 WARN org.apache.hadoop.hdfs.server.protocol.InterDatanodeProtocol: Failed to recover block (block=BP-1629871299-10.15.62.52-1523963075
824:blk_4791946168_3725472211, datanode=DatanodeInfoWithStorage[10.15.67.25:50010,null,null])
java.io.IOException: THIS IS NOT SUPPOSED TO HAPPEN: replica.getGenerationStamp() >= recoveryId = 0, block=blk_4791946168_3725472211, replica=FinalizedReplica
, blk_4791946168_3725472211, FINALIZED
  getNumBytes()     = 553812
  getBytesOnDisk()  = 553812
  getVisibleLength()= 553812
  getVolume()       = /data6/hadoopdata/dfs
  getBlockURI()     = file:/data6/hadoopdata/dfs/current/BP-1629871299-10.15.62.52-1523963075824/current/finalized/subdir31/subdir11/blk_4791946168
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecoveryImpl(FsDatasetImpl.java:2623)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2576)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2565)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initReplicaRecovery(DataNode.java:3024)
        at org.apache.hadoop.hdfs.protocolPB.InterDatanodeProtocolServerSideTranslatorPB.initReplicaRecovery(InterDatanodeProtocolServerSideTranslatorPB.java:
55)
        at org.apache.hadoop.hdfs.protocol.proto.InterDatanodeProtocolProtos$InterDatanodeProtocolService$2.callBlockingMethod(InterDatanodeProtocolProtos.jav
a:3105)

DN

dn -> 心跳

BPServiceActor.offerService方法：
心跳分两种：汇报心跳
send heartbeat or block-report

心跳及块汇报。

1.心跳汇报以下4个信息

          // All heartbeat messages include following info:
          // -- Datanode name
          // -- data transfer port
          // -- Total capacity
          // -- Bytes remaining

nn收到心跳后主要更新节点信息。
nn端代码：

        // Check if this datanode should actually be shutdown instead. 
        if (nodeinfo != null && shouldNodeShutdown(nodeinfo)) {
          setDatanodeDead(nodeinfo);
          throw new DisallowedDatanodeException(nodeinfo);
        }
 
        //如果不存在此节点信息，说明此节点还未注册，返回节点注册命令
        if (nodeinfo == null || !nodeinfo.isAlive) {
          return new DatanodeCommand[]{DatanodeCommand.REGISTER};
        }
 
        updateStats(nodeinfo, false);
        nodeinfo.updateHeartbeat(capacity, dfsUsed, remaining, xceiverCount);
        updateStats(nodeinfo, true);

所以对于心跳第一部分，dn端主要汇报使用量，nn基本不做处理。当节点未注册时，这时候会返回命令，即注册节点的命令。

2.块汇报

NN

1. NameNodeRpcServer.sendHeartbeat
2. namesystem.handleHeartbeat
3. DatanodeManager.handleHeartbeat

/** Handle heartbeat from datanodes. */
  public DatanodeCommand[] handleHeartbeat(DatanodeRegistration nodeReg,
      StorageReport[] reports, final String blockPoolId,
      long cacheCapacity, long cacheUsed, int xceiverCount, 
      int maxTransfers, int failedVolumes,
      VolumeFailureSummary volumeFailureSummary,
      @Nonnull SlowPeerReports slowPeers,
      @Nonnull SlowDiskReports slowDisks) throws IOException {
    final DatanodeDescriptor nodeinfo;
    // 心跳中的节点未注册，则下达注册命令
    try {
      nodeinfo = getDatanode(nodeReg);
    } catch (UnregisteredNodeException e) {
      return new DatanodeCommand[]{RegisterCommand.REGISTER};
    }

    // Check if this datanode should actually be shutdown instead.
    if (nodeinfo != null && nodeinfo.isDisallowed()) {
      setDatanodeDead(nodeinfo);
      throw new DisallowedDatanodeException(nodeinfo);
    }

    if (nodeinfo == null || !nodeinfo.isRegistered()) {
      return new DatanodeCommand[]{RegisterCommand.REGISTER};
    }
    heartbeatManager.updateHeartbeat(nodeinfo, reports, cacheCapacity,
        cacheUsed, xceiverCount, failedVolumes, volumeFailureSummary);

    // If we are in safemode, do not send back any recovery / replication
    // requests. Don't even drain the existing queue of work.
    if (namesystem.isInSafeMode()) {
      return new DatanodeCommand[0];
    }

    // block recovery command
    final BlockRecoveryCommand brCommand = getBlockRecoveryCommand(blockPoolId,
        nodeinfo);
    if (brCommand != null) {
      return new DatanodeCommand[]{brCommand};
    }

    final List<DatanodeCommand> cmds = new ArrayList<>();
    // Allocate _approximately_ maxTransfers pending tasks to DataNode.
    // NN chooses pending tasks based on the ratio between the lengths of
    // replication and erasure-coded block queues.
    int totalReplicateBlocks = nodeinfo.getNumberOfReplicateBlocks();
    int totalECBlocks = nodeinfo.getNumberOfBlocksToBeErasureCoded();
    int totalBlocks = totalReplicateBlocks + totalECBlocks;
    if (totalBlocks > 0) {
      int numReplicationTasks = (int) Math.ceil(
          (double) (totalReplicateBlocks * maxTransfers) / totalBlocks);
      int numECTasks = (int) Math.ceil(
          (double) (totalECBlocks * maxTransfers) / totalBlocks);
      if (LOG.isDebugEnabled()) {
        LOG.debug("Pending replication tasks: " + numReplicationTasks
            + " erasure-coded tasks: " + numECTasks);
      }
      // check pending replication tasks
      List<BlockTargetPair> pendingList = nodeinfo.getReplicationCommand(
          numReplicationTasks);
      if (pendingList != null && !pendingList.isEmpty()) {
        cmds.add(new BlockCommand(DatanodeProtocol.DNA_TRANSFER, blockPoolId,
            pendingList));
      }
      // check pending erasure coding tasks
      List<BlockECReconstructionInfo> pendingECList = nodeinfo
          .getErasureCodeCommand(numECTasks);
      if (pendingECList != null && !pendingECList.isEmpty()) {
        cmds.add(new BlockECReconstructionCommand(
            DNA_ERASURE_CODING_RECONSTRUCTION, pendingECList));
      }
    }

    // check block invalidation
    Block[] blks = nodeinfo.getInvalidateBlocks(blockInvalidateLimit);
    if (blks != null) {
      cmds.add(new BlockCommand(DatanodeProtocol.DNA_INVALIDATE, blockPoolId,
          blks));
    }
    // cache commands
    addCacheCommands(blockPoolId, nodeinfo, cmds);
    // key update command
    blockManager.addKeyUpdateCommand(cmds, nodeinfo);

    // check for balancer bandwidth update
    if (nodeinfo.getBalancerBandwidth() > 0) {
      cmds.add(new BalancerBandwidthCommand(nodeinfo.getBalancerBandwidth()));
      // set back to 0 to indicate that datanode has been sent the new value
      nodeinfo.setBalancerBandwidth(0);
    }

    if (slowPeerTracker != null) {
      final Map<String, Double> slowPeersMap = slowPeers.getSlowPeers();
      if (!slowPeersMap.isEmpty()) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("DataNode " + nodeReg + " reported slow peers: " +
              slowPeersMap);
        }
        for (String slowNodeId : slowPeersMap.keySet()) {
          slowPeerTracker.addReport(slowNodeId, nodeReg.getIpcAddr(false));
        }
      }
    }

    if (slowDiskTracker != null) {
      if (!slowDisks.getSlowDisks().isEmpty()) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("DataNode " + nodeReg + " reported slow disks: " +
              slowDisks.getSlowDisks());
        }
        slowDiskTracker.addSlowDiskReport(nodeReg.getIpcAddr(false), slowDisks);
      }
    }

    if (!cmds.isEmpty()) {
      return cmds.toArray(new DatanodeCommand[cmds.size()]);
    }

    return new DatanodeCommand[0];
  }

1.心跳中的节点未注册，则下达注册命令
2.如果是standby则下达空命令。snn也是会更新状态的。

一个给定的数据节点进行心跳信息的上报，主要做2个操作

• 1.心跳信息的记录，避免数据节点超时
• 2.调整新的名字节点中维护的数据块分配情况 blockManager更新。

// block recovery command
// check pending replication tasks
// check pending erasure coding tasks
// check block invalidation
无效快这里有一个限制每次1000个。

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总结：
上述仅仅处理心跳（还没处理块汇报），心跳到达nn，nn端开始根据信息来分析，下达命令。
那么，问题来了：

无效块：怎么知道哪些块是无效块？？？

---