当我尝试在hdfs中写入文件时，我面临以下错误。
它是4节点群集。网络拓扑表明没有节点可供选择。但是所有数据节点都在运行，也发生了阻止报告。我是否缺少某些配置。
2018-12-09 10:32:00,048 DEBUG org.apache.hadoop.net.NetworkTopology: No node to choose.
2018-12-09 10:32:00,049 DEBUG org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to choose from local rack (location = /home/hdfs/rack-138); the second replica is not found, retry choosing ramdomly
下面是我在Scala中的代码行。
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import java.io.PrintWriter;
object Hdfs {
def write(uri: String, filePath: String, data: Array[Byte]): Unit = {
System.setProperty("HADOOP_USER_NAME", "hdfs")
val path = new Path(filePath)
val conf = new Configuration()
conf.set("fs.defaultFS", uri)
val fs = FileSystem.get(conf)
val os = fs.create(path)
os.write(data)
fs.close()
os.close()
}
def main(args: Array[String]) {
//val conf = ConfigFactory.load()
// write(conf.getString("hdfs.uri"), conf.getString("hdfs.result_path"), "Hello World".getBytes)
write("hdfs://hadoop-master:8020","test.txt","Hello World".getBytes)
}
}
================ core-site.xml ===========
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://hadoop-master:8020</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://hadoop-master:8020</value>
</property>
<property>
<name>topology.script.file.name</name>
<value>/opt/hadoop/etc/hadoop/rack-topology.sh</value>
</property>
</configuration>
=======================================
[hdfs@hadoop-master hadoop]$ hadoop dfsadmin -report
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.
Configured Capacity: 3107945754624 (2.83 TB)
Present Capacity: 2892706406400 (2.63 TB)
DFS Remaining: 2892705902592 (2.63 TB)
DFS Used: 503808 (492 KB)
DFS Used%: 0.00%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
-------------------------------------------------
Live datanodes (3):
Name: 172.19.0.4:50010 (datanode3.hadoopspark_hadoop)
Hostname: hadoop-slave3
Rack: /default/rack
Decommission Status : Normal
Configured Capacity: 1035981918208 (964.83 GB)
DFS Used: 167936 (164 KB)
Non DFS Used: 71746449408 (66.82 GB)
DFS Remaining: 964235300864 (898.01 GB)
DFS Used%: 0.00%
DFS Remaining%: 93.07%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Sat Dec 08 22:40:57 UTC 2018
Name: 172.19.0.2:50010 (datanode1.hadoopspark_hadoop)
Hostname: hadoop-slave1
Rack: /default/rack
Decommission Status : Normal
Configured Capacity: 1035981918208 (964.83 GB)
DFS Used: 167936 (164 KB)
Non DFS Used: 71746449408 (66.82 GB)
DFS Remaining: 964235300864 (898.01 GB)
DFS Used%: 0.00%
DFS Remaining%: 93.07%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Sat Dec 08 22:40:57 UTC 2018
Name: 172.19.0.3:50010 (datanode2.hadoopspark_hadoop)
Hostname: hadoop-slave2
Rack: /default/rack
Decommission Status : Normal
Configured Capacity: 1035981918208 (964.83 GB)
DFS Used: 167936 (164 KB)
Non DFS Used: 71746449408 (66.82 GB)
DFS Remaining: 964235300864 (898.01 GB)
DFS Used%: 0.00%
DFS Remaining%: 93.07%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Sat Dec 08 22:40:57 UTC 2018
[hdfs@hadoop-master hadoop]$