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Hbase批量导入数据时，服务器负载较高，导致HDFS数据没有及时均衡，导致有一个DataNode数据暴增，手动进行balancer。
增加HDFS DataNode节点，想要均衡数据存储，执行
hdfs balancer -threshold 10 突然有一些节点报错
18/09/21 17:51:37 WARN balancer.Dispatcher: Failed to move blk_1073837252_96442 with size=268435456 from 10.248.161.6:9866:DISK to 10.248.161.10:9866:DISK through 10.248.161.6:9866
java.net.NoRouteToHostException: 没有到主机的路由
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.dispatch(Dispatcher.java:356)
at org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.access$3000(Dispatcher.java:233)
at org.apache.hadoop.hdfs.server.balancer.Dispatcher$1.run(Dispatcher.java:1148)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)后来发现是新增的节点没有关闭防火墙 。。。。。
CentOS7 执行
service firewalld status
service firewalld stop
systemctl disable firewalld.service
service firewalld status然后再查看日志发现恢复正常。
运行了十个小时才完成~~~~~~~~~~~
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.movedWinWidth = 5400000 (default=5400000)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.moverThreads = 1000 (default=1000)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.dispatcherThreads = 200 (default=200)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.datanode.balance.max.concurrent.moves = 50 (default=50)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.getBlocks.size = 2147483648 (default=2147483648)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.getBlocks.min-block-size = 10485760 (default=10485760)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.balancer.max-size-to-move = 10737418240 (default=10737418240)
17/12/08 19:16:28 INFO balancer.Balancer: dfs.blocksize = 268435456 (default=134217728)
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.32:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.31:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.13:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.7:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.12:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.9:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.40:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.35:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.10:9866
17/12/08 19:16:28 INFO net.NetworkTopology: Adding a new node: /default/10.248.161.6:9866
17/12/08 19:16:28 INFO balancer.Balancer: 0 over-utilized: []
17/12/08 19:16:28 INFO balancer.Balancer: 0 underutilized: []
The cluster is balanced. Exiting...
17/12/08 19:16:28 311 3.05 TB 0 B 0 B
17/12/08 19:16:28 Balancing took 9.853577777777778 hours