question There are 0 datanode(s) running and no node(s) are excluded in this operation in Support Questions

question There are 0 datanode(s) running and no node(s) are excluded in this operation in Support Questions https://community.cloudera.com/t5/Support-Questions/There-are-0-datanode-s-running-and-no-node-s-are-excluded-in/m-p/294306#M217178 I installed cloudera as single node in my laptop and insalled all the steps as per the documents. The namenode and datanode seems to be not connected. Also I am getting below error when trying to put a filein hdfs. 20/04/19 12:58:49 WARN hdfs.DFSClient: DataStreamer Exception org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/hive/test.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation. at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1723) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3508) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:694) at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.addBlock(AuthorizationProviderProxyClientProtocol.java:219) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:507) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2278) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2274) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1924) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2272) at org.apache.hadoop.ipc.Client.call(Client.java:1504) at org.apache.hadoop.ipc.Client.call(Client.java:1441) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:231) at com.sun.proxy.$Proxy16.addBlock(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:425) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:258) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104) at com.sun.proxy.$Proxy17.addBlock(Unknown Source) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1875) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1671) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:790) put: File /user/hive/test.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.   The below is the hostname and /etc/hosts conf arindam@arindam-pc-ubuntu:/etc/hadoop/conf$ hostname -f arindam-pc-ubuntu arindam@arindam-pc-ubuntu:/etc/hadoop/conf$ cat /etc/hosts 127.0.1.1 arindam-pc-ubuntu 127.0.0.1 localhost # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters   Below is details of hdfs-site.xml   <configuration> <property> <name>dfs.namenode.name.dir</name> <value>file:///dfs/nn</value> </property> <property> <name>dfs.namenode.servicerpc-address</name> <value>arindam-pc-ubuntu:8022</value> </property> <property> <name>dfs.https.address</name> <value>arindam-pc-ubuntu:50470</value> </property> <property> <name>dfs.https.port</name> <value>50470</value> </property> <property> <name>dfs.namenode.http-address</name> <value>arindam-pc-ubuntu:50070</value> </property> <property> <name>dfs.replication</name> <value>3</value> </property> <property> <name>dfs.blocksize</name> <value>134217728</value> </property> <property> <name>dfs.client.use.datanode.hostname</name> <value>true</value> </property> <property> <name>fs.permissions.umask-mode</name> <value>022</value> </property> <property> <name>dfs.namenode.acls.enabled</name> <value>false</value> </property> <property> <name>dfs.client.use.legacy.blockreader</name> <value>false</value> </property> <property> <name>dfs.client.read.shortcircuit</name> <value>false</value> </property> <property> <name>dfs.domain.socket.path</name> <value>/var/run/hdfs-sockets/dn</value> </property> <property> <name>dfs.client.read.shortcircuit.skip.checksum</name> <value>false</value> </property> <property> <name>dfs.client.domain.socket.data.traffic</name> <value>false</value> </property> <property> <name>dfs.datanode.hdfs-blocks-metadata.enabled</name> <value>true</value> </property> </configuration> ---------------------------------------------------------------------------------------- Below is core-site.xml <configuration> <property> <name>fs.defaultFS</name> <value>hdfs://arindam-pc-ubuntu:8020</value> </property> <property> <name>fs.trash.interval</name> <value>1</value> </property> <property> <name>io.compression.codecs</name> <value>org.apache.hadoop.io.compress.DefaultCodec,org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.BZip2Codec,org.apache.hadoop.io.compress.DeflateCodec,org.apache.hadoop.io.compress.SnappyCodec,org.apache.hadoop.io.compress.Lz4Codec</value> </property> <property> <name>hadoop.security.authentication</name> <value>simple</value> </property> <property> <name>hadoop.security.authorization</name> <value>false</value> </property> <property> <name>hadoop.rpc.protection</name> <value>authentication</value> </property> <property> <name>hadoop.security.auth_to_local</name> <value>DEFAULT</value> </property> <property> <name>hadoop.proxyuser.oozie.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.oozie.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.mapred.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.mapred.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.flume.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.flume.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.HTTP.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.HTTP.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hive.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hive.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hue.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hue.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.httpfs.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.httpfs.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hdfs.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.hdfs.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.yarn.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.yarn.groups</name> <value>*</value> </property> <property> <name>hadoop.security.group.mapping</name> <value>org.apache.hadoop.security.ShellBasedUnixGroupsMapping</value> </property> <property> <name>hadoop.security.instrumentation.requires.admin</name> <value>false</value> </property> <property> <name>net.topology.script.file.name</name> <value>/etc/hadoop/conf.cloudera.yarn/topology.py</value> </property> <property> <name>io.file.buffer.size</name> <value>65536</value> </property> <property> <name>hadoop.ssl.enabled</name> <value>false</value> </property> <property> <name>hadoop.ssl.require.client.cert</name> <value>false</value> <final>true</final> </property> <property> <name>hadoop.ssl.keystores.factory.class</name> <value>org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory</value> <final>true</final> </property> <property> <name>hadoop.ssl.server.conf</name> <value>ssl-server.xml</value> <final>true</final> </property> <property> <name>hadoop.ssl.client.conf</name> <value>ssl-client.xml</value> <final>true</final> </property> </configuration>   Please let me know why this error is there.  This seems to be never fixed and not sure whether this issue is when I have followed all the steps as per cloudera instaructions.         Fri, 16 Sep 2022 14:36:29 GMT Hive_SQL 2022-09-16T14:36:29Z