Error writing file

[Researcher86]

Error writing file

Run

docker run -it --rm --name=hadoopserver -p 8030:8030 -p 8040:8040 -p 8042:8042 -p 8088:8088 -p 19888:19888 -p 49707:49707 -p 50010:50010 -p 50020:50020 -p 50070:50070 -p 50075:50075 -p 50090:50090 -p 9000:9000 sequenceiq/hadoop-docker:latest /etc/bootstrap.sh –d

App

public static void main(String[] args) throws IOException {
        Configuration conf = new Configuration();
        conf.set("fs.defaultFS", "hdfs://localhost:9000");

        System.setProperty("HADOOP_USER_NAME", "root");
        System.setProperty("hadoop.home.dir", "/");

        FileSystem fileSystem = FileSystem.get(conf);

        try (FSDataOutputStream out = fileSystem.create(new Path("test.txt"), true)) {
            out.write("Test".getBytes());
        }
    }

error

org.apache.hadoop.ipc.RemoteException: File /user/root/test.txt could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and 1 node(s) are excluded in this operation.
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1550)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3067)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:722)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:492)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

	at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1481)
	at org.apache.hadoop.ipc.Client.call(Client.java:1427)
	at org.apache.hadoop.ipc.Client.call(Client.java:1337)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
	at com.sun.proxy.$Proxy13.addBlock(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:440)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:398)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:335)
	at com.sun.proxy.$Proxy14.addBlock(Unknown Source)
	at org.apache.hadoop.hdfs.DataStreamer.locateFollowingBlock(DataStreamer.java:1733)
	at org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1536)
	at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:658)

what am I doing wrong?

[QingHui653]

I also encountered this problem. in hadoop-docker2.7.1 and hadoop 2.9.1.
Have you solved it? How to solve it?
Thank You.

[zakicheung]

my envs：hadoop-docker 2.7.0 hadoop 2.7.0 MacOS 10.14
I also encountered this problem , but I solved it according to the following steps.

1. vi MacOS /etc/hosts
   add {host machine ip} {hadoop-docker hostname}

2. touch a hdfs-site.xml, then add it in your java code

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    <property>
        <name>dfs.client.use.datanode.hostname</name>
        <value>true</value>
    </property>
    <property>
        <name>dfs.datanode.use.datanode.hostname</name>
        <value>true</value>
    </property>
</configuration>

conf.addResource(new Path("/Users/mac/IdeaProjects/playgroup/hdfs-site.xml"));