当前集群

主机名称 IP地址 角色 统一安装目录 统一安装用户
sht-sgmhadoopnn-01 172.16.101.55 namenode,resourcemanager

/usr/local/hadoop(软连接)

/usr/local/hadoop-2.7.4

/usr/local/zookeeper（软连接）

/usr/local/zookeeper-3.4.9

root
sht-sgmhadoopnn-02 172.16.101.56 namenode,resourcemanager
sht-sgmhadoopdn-01 172.16.101.58 datanode,nodemanager,journalnode,zookeeper
sht-sgmhadoopdn-02 172.16.101.59 datanode,nodemanager,journalnode,zookeeper
sht-sgmhadoopdn-03 172.16.101.60 datanode,nodemanager,journalnode,zookeeper
sht-sgmhadoopdn-04 172.16.101.66 datanode,nodemanager

因sht-sgmhadoopdn-04节点异常，需要从当前集群剔除

1. 在active节点sht-sgmhadoopnn-01修改配置文件

slaves

sht-sgmhadoopdn-

sht-sgmhadoopdn-

sht-sgmhadoopdn-

hdfs-site.xml

  <property>

        <name>dfs.replication</name>

        <value>3</value>

  </property>

hdfs-site.xml

  <property>

        <name>dfs.hosts</name>

        <value>/usr/local/hadoop/etc/hadoop/hdfs_includes</value>

  </property>

  <property>

        <name>dfs.hosts.exclude</name>

        <value>/usr/local/hadoop/etc/hadoop/hdfs_excludes</value>

  </property>

yarn-site.xml

  <property>

        <name>dfs.hosts</name>

        <value>/usr/local/hadoop/etc/hadoop/yarn_includes</value>

  </property>

  <property>

        <name>dfs.hosts.exclude</name>

        <value>/usr/local/hadoop/etc/hadoop/yarn_excludes</value>

  </property>

如果存在上述hosts配置，则可以直接进入第二步，否则，需要将上述参数添加至对应文件里，并重启hdfs和yarn集群

2. 添加白名单和黑名单

白名单

# echo sht-sgmhadoopdn- > /usr/local/hadoop/etc/hadoop/hdfs_includes

# echo sht-sgmhadoopdn- > /usr/local/hadoop/etc/hadoop/hdfs_includes

# echo sht-sgmhadoopdn- > /usr/local/hadoop/etc/hadoop/hdfs_includes

黑名单

# echo sht-sgmhadoopdn- > /usr/local/hadoop/etc/hadoop/hdfs_excludes

# echo sht-sgmhadoopdn- > /usr/local/hadoop/etc/hadoop/yarn_excludes

在所有节点更新上述参数

3. 在active节点sht-sgmhadoopnn-01刷新节点信息

此命令告诉resourcemanager重新读取配置文件yarn-site.xml，将存在yarn_excludes文件中的节点退出当前yarn集群，并不在分配job到该节点

# yarn rmadmin -refreshNodes

输出log

2019-03-30 00:40:48,751 INFO org.apache.hadoop.conf.Configuration: found resource yarn-site.xml at file:/usr/local/hadoop-2.7.4/etc/hadoop/yarn-site.xml

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Setting the includes file to /usr/local/hadoop/etc/hadoop/yarn_includes

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Setting the excludes file to /usr/local/hadoop/etc/hadoop/yarn_excludes

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Refreshing hosts (include/exclude) list

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-01 to the list of included hosts from /usr/local/hadoop/etc/hadoop/yarn_includes

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-02 to the list of included hosts from /usr/local/hadoop/etc/hadoop/yarn_includes

2019-03-30 00:40:48,755 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-03 to the list of included hosts from /usr/local/hadoop/etc/hadoop/yarn_includes

2019-03-30 00:40:48,756 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-04 to the list of excluded hosts from /usr/local/hadoop/etc/hadoop/yarn_excludes

2019-03-30 00:40:48,757 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: Deactivating Node sht-sgmhadoopdn-04:21570 as it is now DECOMMISSIONED

2019-03-30 00:40:48,758 INFO org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl: sht-sgmhadoopdn-04:21570 Node Transitioned from RUNNING to DECOMMISSIONED

2019-03-30 00:40:48,756 INFO org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=root	IP=172.16.101.55	OPERATION=refreshNodes	TARGET=AdminService	RESULT=SUCCESS

2019-03-30 00:40:48,772 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler: Removed node sht-sgmhadoopdn-04:21570 clusterResource: <memory:12288, vCores:24>

2019-03-30 00:40:48,909 INFO org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService: Disallowed NodeManager nodeId: sht-sgmhadoopdn-04:21570 hostname: sht-sgmhadoopdn-04

nodemanager输出log

2019-03-30 00:40:48,910 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Recieved SHUTDOWN signal from Resourcemanager as part of heartbeat, hence shutting down.

2019-03-30 00:40:48,910 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Message from ResourceManager: Disallowed NodeManager nodeId: sht-sgmhadoopdn-04:21570 hostname: sht-sgmhadoopdn-04

2019-03-30 00:40:49,023 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@0.0.0.0:8042

2019-03-30 00:40:49,125 INFO org.apache.hadoop.ipc.Server: Stopping server on 21570

2019-03-30 00:40:49,133 INFO org.apache.hadoop.ipc.Server: Stopping IPC Server Responder

2019-03-30 00:40:49,133 INFO org.apache.hadoop.ipc.Server: Stopping IPC Server listener on 21570

2019-03-30 00:40:49,135 WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl: org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl is interrupted. Exiting.

2019-03-30 00:40:49,154 INFO org.apache.hadoop.ipc.Server: Stopping server on 8040

2019-03-30 00:40:49,159 INFO org.apache.hadoop.ipc.Server: Stopping IPC Server listener on 8040

2019-03-30 00:40:49,159 INFO org.apache.hadoop.ipc.Server: Stopping IPC Server Responder

2019-03-30 00:40:49,160 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService: Public cache exiting

2019-03-30 00:40:49,162 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NodeManager metrics system...

2019-03-30 00:40:49,163 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NodeManager metrics system stopped.

2019-03-30 00:40:49,163 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NodeManager metrics system shutdown complete.

2019-03-30 00:40:49,178 INFO org.apache.hadoop.util.ExitUtil: Exiting with status -1

2019-03-30 00:40:49,182 INFO org.apache.hadoop.yarn.server.nodemanager.NodeManager: SHUTDOWN_MSG:

/************************************************************

SHUTDOWN_MSG: Shutting down NodeManager at sht-sgmhadoopdn-04/172.16.101.66

************************************************************/

此命令告诉hdfs重新读取配置文件hdfs-site.xml，将存在hdfs_excludes文件中的节点退出当前hdfs集群。

# hdfs dfsadmin -refreshNodes

输出log

2019-03-30 00:43:00,576 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-01 to the list of included hosts from /usr/local/hadoop/etc/hadoop/hdfs_includes

2019-03-30 00:43:00,576 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-02 to the list of included hosts from /usr/local/hadoop/etc/hadoop/hdfs_includes

2019-03-30 00:43:00,576 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-03 to the list of included hosts from /usr/local/hadoop/etc/hadoop/hdfs_includes

2019-03-30 00:43:00,577 INFO org.apache.hadoop.util.HostsFileReader: Adding sht-sgmhadoopdn-04 to the list of excluded hosts from /usr/local/hadoop/etc/hadoop/hdfs_excludes

2019-03-30 00:43:01,266 INFO org.apache.hadoop.ipc.Server: IPC Server handler 5 on 8020, call org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol.sendHeartbeat from 172.16.101.66:16197 Call#1641 Retry#0

org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException: Datanode denied communication with namenode because the host is not in the include-list: 172.16.101.66:50010

	at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.handleHeartbeat(DatanodeManager.java:1340)

	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.handleHeartbeat(FSNamesystem.java:4512)

	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.sendHeartbeat(NameNodeRpcServer.java:1298)

	at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.sendHeartbeat(DatanodeProtocolServerSideTranslatorPB.java:114)

	at org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:28754)

	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)

	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)

	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2217)

	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)

	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:1746)

	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)

2019-03-30 00:43:28,046 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* removeDeadDatanode: lost heartbeat from 172.16.101.66:50010

2019-03-30 00:43:28,051 INFO org.apache.hadoop.net.NetworkTopology: Removing a node: /default-rack/172.16.101.66:50010

datanode输出log

2019-03-30 00:43:01,270 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Block pool BP-698223843-172.16.101.55-1553701973789 (Datanode Uuid 30bc4855-5dca-412a-bf9a-9529bcfe3ea0) service to sht-sgmhadoopnn-01/172.16.101.55:8020 is shutting down

org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException): Datanode denied communication with namenode because the host is not in the include-list: 172.16.101.66:50010

	at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.handleHeartbeat(DatanodeManager.java:1340)

	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.handleHeartbeat(FSNamesystem.java:4512)

	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.sendHeartbeat(NameNodeRpcServer.java:1298)

	at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.sendHeartbeat(DatanodeProtocolServerSideTranslatorPB.java:114)

	at org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:28754)

	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)

	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)

	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2217)

	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)

	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:1746)

	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)

	at org.apache.hadoop.ipc.Client.call(Client.java:1476)

	at org.apache.hadoop.ipc.Client.call(Client.java:1413)

	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)

	at com.sun.proxy.$Proxy15.sendHeartbeat(Unknown Source)

	at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.sendHeartbeat(DatanodeProtocolClientSideTranslatorPB.java:152)

	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:402)

	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:500)

	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:659)

	at java.lang.Thread.run(Thread.java:745)

2019-03-30 00:43:01,272 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool BP-698223843-172.16.101.55-1553701973789 (Datanode Uuid 30bc4855-5dca-412a-bf9a-9529bcfe3ea0) service to sht-sgmhadoopnn-01/172.16.101.55:8020

4. 执行hdfs集群负载均衡

# hdfs dfs -setrep -R -w   /

输出log

# hdfs dfs -setrep -R -w 3  /

Replication 3 set: /CentOS-6.8-x86_64-bin-DVD2.iso

Replication 3 set: /hadoop-2.8.1.tar.gz

Replication 3 set: /slaves

Replication 3 set: /yarn-env.sh

Waiting for /CentOS-6.8-x86_64-bin-DVD2.iso ...

WARNING: the waiting time may be long for DECREASING the number of replications.

............................................................................................... done

Waiting for /hadoop-2.8.1.tar.gz ... done

Waiting for /slaves ... done

Waiting for /yarn-env.sh ... done

5.停止sht-sgmhadoopdn-04节点的datanode和nodemanager角色

6. 清空各节点黑白名单

# echo > /usr/local/hadoop/etc/hadoop/hdfs_excludes

# echo > /usr/local/hadoop/etc/hadoop/yarn_excludes

# echo > /usr/local/hadoop/etc/hadoop/hdfs_includes

# echo > /usr/local/hadoop/etc/hadoop/yarn_includes

7. 在适当时候建议重启hdfs和yarn集群

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