Unable to determine address of the host-falling back to "localhost" address

※ name node 포맷할 때

Unable to determine address of the host-falling back to "localhost" address 와 같은 경고가 발생한다면

$ hdfs namenode -format
17/10/13 09:00:07 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   user = hadoop-user
STARTUP_MSG:   host = java.net.UnknownHostException: ubuntu: ubuntu: Name or service not known
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 2.8.1
STARTUP_MSG:   classpath = /usr/local/hadoop/etc/hadoop:/usr/local/hadoop/share/hadoop/common/lib/hadoop-annotations-2.8.1.jar:/usr/local/hadoop/share/hadoop/common/lib/jets3t-0.9.0.jar:/usr/local/hadoop/share/hadoop/common/lib/xmlenc-0.52.jar:/usr/local/hadoop/share/hadoop/common/lib/jackson-mapper-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-lang-2.6.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-collections-3.2.2.jar:/usr/local/hadoop/share/hadoop/common/lib/jaxb-api-2.2.2.jar:/usr/local/hadoop/share/hadoop/common/lib/json-smart-1.1.1.jar:/usr/local/hadoop/share/hadoop/common/lib/servlet-api-2.5.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-configuration-1.6.jar:/usr/local/hadoop/share/hadoop/common/lib/avro-1.7.4.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-io-2.4.jar:/usr/local/hadoop/share/hadoop/common/lib/api-asn1-api-1.0.0-M20.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-math3-3.1.1.jar:/usr/local/hadoop/share/hadoop/common/lib/xz-1.0.jar:/usr/local/hadoop/share/hadoop/common/lib/jersey-json-1.9.jar:/usr/local/hadoop/share/hadoop/common/lib/jsr305-3.0.0.jar:/usr/local/hadoop/share/hadoop/common/lib/activation-1.1.jar:/usr/local/hadoop/share/hadoop/common/lib/asm-3.2.jar:/usr/local/hadoop/share/hadoop/common/lib/paranamer-2.3.jar:/usr/local/hadoop/share/hadoop/common/lib/guava-11.0.2.jar:/usr/local/hadoop/share/hadoop/common/lib/api-util-1.0.0-M20.jar:/usr/local/hadoop/share/hadoop/common/lib/htrace-core4-4.0.1-incubating.jar:/usr/local/hadoop/share/hadoop/common/lib/jcip-annotations-1.0.jar:/usr/local/hadoop/share/hadoop/common/lib/curator-recipes-2.7.1.jar:/usr/local/hadoop/share/hadoop/common/lib/jackson-xc-1.9.13.jar:/usr/local/hadoop/share/hadoop/common/lib/stax-api-1.0-2.jar:/usr/local/hadoop/share/hadoop/common/lib/snappy-java-1.0.4.1.jar:/usr/local/hadoop/share/hadoop/common/lib/jackson-jaxrs-1.9.13.jar:/usr/local/hadoop/share/hadoop/common/lib/nimbus-jose-jwt-3.9.jar:/usr/local/hadoop/share/hadoop/common/lib/jetty-6.1.26.jar:/usr/local/hadoop/share/hadoop/common/lib/log4j-1.2.17.jar:/usr/local/hadoop/share/hadoop/common/lib/jettison-1.1.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-digester-1.8.jar:/usr/local/hadoop/share/hadoop/common/lib/jetty-util-6.1.26.jar:/usr/local/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar:/usr/local/hadoop/share/hadoop/common/lib/gson-2.2.4.jar:/usr/local/hadoop/share/hadoop/common/lib/jaxb-impl-2.2.3-1.jar:/usr/local/hadoop/share/hadoop/common/lib/curator-client-2.7.1.jar:/usr/local/hadoop/share/hadoop/common/lib/httpcore-4.4.4.jar:/usr/local/hadoop/share/hadoop/common/lib/jackson-core-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/common/lib/jsp-api-2.1.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-beanutils-1.7.0.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-compress-1.4.1.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-beanutils-core-1.8.0.jar:/usr/local/hadoop/share/hadoop/common/lib/protobuf-java-2.5.0.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-net-3.1.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-logging-1.1.3.jar:/usr/local/hadoop/share/hadoop/common/lib/jersey-core-1.9.jar:/usr/local/hadoop/share/hadoop/common/lib/curator-framework-2.7.1.jar:/usr/local/hadoop/share/hadoop/common/lib/httpclient-4.5.2.jar:/usr/local/hadoop/share/hadoop/common/lib/jsch-0.1.51.jar:/usr/local/hadoop/share/hadoop/common/lib/mockito-all-1.8.5.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-cli-1.2.jar:/usr/local/hadoop/share/hadoop/common/lib/apacheds-i18n-2.0.0-M15.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-codec-1.4.jar:/usr/local/hadoop/share/hadoop/common/lib/jersey-server-1.9.jar:/usr/local/hadoop/share/hadoop/common/lib/netty-3.6.2.Final.jar:/usr/local/hadoop/share/hadoop/common/lib/jetty-sslengine-6.1.26.jar:/usr/local/hadoop/share/hadoop/common/lib/hadoop-auth-2.8.1.jar:/usr/local/hadoop/share/hadoop/common/lib/apacheds-kerberos-codec-2.0.0-M15.jar:/usr/local/hadoop/share/hadoop/common/lib/slf4j-api-1.7.10.jar:/usr/local/hadoop/share/hadoop/common/lib/zookeeper-3.4.6.jar:/usr/local/hadoop/share/hadoop/common/lib/junit-4.11.jar:/usr/local/hadoop/share/hadoop/common/lib/hamcrest-core-1.3.jar:/usr/local/hadoop/share/hadoop/common/lib/java-xmlbuilder-0.4.jar:/usr/local/hadoop/share/hadoop/common/hadoop-nfs-2.8.1.jar:/usr/local/hadoop/share/hadoop/common/hadoop-common-2.8.1-tests.jar:/usr/local/hadoop/share/hadoop/common/hadoop-common-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs:/usr/local/hadoop/share/hadoop/hdfs/lib/xmlenc-0.52.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jackson-mapper-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-lang-2.6.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/servlet-api-2.5.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/xml-apis-1.3.04.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-io-2.4.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jsr305-3.0.0.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/asm-3.2.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/guava-11.0.2.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/htrace-core4-4.0.1-incubating.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/okio-1.4.0.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jetty-6.1.26.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/okhttp-2.4.0.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/netty-all-4.0.23.Final.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/log4j-1.2.17.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/leveldbjni-all-1.8.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jetty-util-6.1.26.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-daemon-1.0.13.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jackson-core-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/protobuf-java-2.5.0.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/xercesImpl-2.9.1.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-logging-1.1.3.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jersey-core-1.9.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-cli-1.2.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/commons-codec-1.4.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/jersey-server-1.9.jar:/usr/local/hadoop/share/hadoop/hdfs/lib/netty-3.6.2.Final.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-native-client-2.8.1-tests.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-native-client-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-nfs-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-client-2.8.1.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-client-2.8.1-tests.jar:/usr/local/hadoop/share/hadoop/hdfs/hadoop-hdfs-2.8.1-tests.jar:/usr/local/hadoop/share/hadoop/yarn/lib/aopalliance-1.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jackson-mapper-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-lang-2.6.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-collections-3.2.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jaxb-api-2.2.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/servlet-api-2.5.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-io-2.4.jar:/usr/local/hadoop/share/hadoop/yarn/lib/curator-test-2.7.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/xz-1.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jersey-json-1.9.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jsr305-3.0.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/zookeeper-3.4.6-tests.jar:/usr/local/hadoop/share/hadoop/yarn/lib/activation-1.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/asm-3.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/guava-11.0.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/guice-3.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jackson-xc-1.9.13.jar:/usr/local/hadoop/share/hadoop/yarn/lib/stax-api-1.0-2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/javassist-3.18.1-GA.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jackson-jaxrs-1.9.13.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jetty-6.1.26.jar:/usr/local/hadoop/share/hadoop/yarn/lib/guice-servlet-3.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/log4j-1.2.17.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jettison-1.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/leveldbjni-all-1.8.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jetty-util-6.1.26.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jaxb-impl-2.2.3-1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/curator-client-2.7.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jackson-core-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-compress-1.4.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-math-2.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/protobuf-java-2.5.0.jar:/usr/local/hadoop/share/hadoop/yarn/lib/javax.inject-1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-logging-1.1.3.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jersey-core-1.9.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jersey-guice-1.9.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jersey-client-1.9.jar:/usr/local/hadoop/share/hadoop/yarn/lib/fst-2.24.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-cli-1.2.jar:/usr/local/hadoop/share/hadoop/yarn/lib/commons-codec-1.4.jar:/usr/local/hadoop/share/hadoop/yarn/lib/objenesis-2.1.jar:/usr/local/hadoop/share/hadoop/yarn/lib/jersey-server-1.9.jar:/usr/local/hadoop/share/hadoop/yarn/lib/netty-3.6.2.Final.jar:/usr/local/hadoop/share/hadoop/yarn/lib/zookeeper-3.4.6.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-api-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-tests-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-common-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-registry-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-sharedcachemanager-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-client-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-common-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-timeline-pluginstorage-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.8.1.jar:/usr/local/hadoop/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/hadoop-annotations-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/aopalliance-1.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/jackson-mapper-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/avro-1.7.4.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/commons-io-2.4.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/xz-1.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/asm-3.2.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/paranamer-2.3.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/guice-3.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/snappy-java-1.0.4.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/guice-servlet-3.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/log4j-1.2.17.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/leveldbjni-all-1.8.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/jackson-core-asl-1.9.13.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/commons-compress-1.4.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/protobuf-java-2.5.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/javax.inject-1.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/jersey-core-1.9.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/jersey-guice-1.9.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/jersey-server-1.9.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/netty-3.6.2.Final.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/junit-4.11.jar:/usr/local/hadoop/share/hadoop/mapreduce/lib/hamcrest-core-1.3.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.8.1-tests.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-plugins-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.8.1.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.8.1.jar:/usr/local/hadoop/contrib/capacity-scheduler/*.jar
STARTUP_MSG:   build = https://git-wip-us.apache.org/repos/asf/hadoop.git -r 20fe5304904fc2f5a18053c389e43cd26f7a70fe; compiled by 'vinodkv' on 2017-06-02T06:14Z
STARTUP_MSG:   java = 1.8.0_144
************************************************************/
17/10/13 09:00:07 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
17/10/13 09:00:07 INFO namenode.NameNode: createNameNode [-format]
Formatting using clusterid: CID-2b6a74d9-2461-487d-acdd-22184f6da5bd
17/10/13 09:00:07 INFO namenode.FSEditLog: Edit logging is async:false
17/10/13 09:00:07 INFO namenode.FSNamesystem: KeyProvider: null
17/10/13 09:00:07 INFO namenode.FSNamesystem: fsLock is fair: true
17/10/13 09:00:07 INFO namenode.FSNamesystem: Detailed lock hold time metrics enabled: false
17/10/13 09:00:08 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
17/10/13 09:00:08 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
17/10/13 09:00:08 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
17/10/13 09:00:08 INFO blockmanagement.BlockManager: The block deletion will start around 2017 Oct 13 09:00:08
17/10/13 09:00:08 INFO util.GSet: Computing capacity for map BlocksMap
17/10/13 09:00:08 INFO util.GSet: VM type       = 64-bit
17/10/13 09:00:08 INFO util.GSet: 2.0% max memory 889 MB = 17.8 MB
17/10/13 09:00:08 INFO util.GSet: capacity      = 2^21 = 2097152 entries
17/10/13 09:00:08 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
17/10/13 09:00:08 INFO blockmanagement.BlockManager: defaultReplication         = 1
17/10/13 09:00:08 INFO blockmanagement.BlockManager: maxReplication             = 512
17/10/13 09:00:08 INFO blockmanagement.BlockManager: minReplication             = 1
17/10/13 09:00:08 INFO blockmanagement.BlockManager: maxReplicationStreams      = 2
17/10/13 09:00:08 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
17/10/13 09:00:08 INFO blockmanagement.BlockManager: encryptDataTransfer        = false
17/10/13 09:00:08 INFO blockmanagement.BlockManager: maxNumBlocksToLog          = 1000
17/10/13 09:00:08 INFO namenode.FSNamesystem: fsOwner             = hadoop-user (auth:SIMPLE)
17/10/13 09:00:08 INFO namenode.FSNamesystem: supergroup          = supergroup
17/10/13 09:00:08 INFO namenode.FSNamesystem: isPermissionEnabled = true
17/10/13 09:00:08 INFO namenode.FSNamesystem: HA Enabled: false
17/10/13 09:00:08 INFO namenode.FSNamesystem: Append Enabled: true
17/10/13 09:00:08 INFO util.GSet: Computing capacity for map INodeMap
17/10/13 09:00:08 INFO util.GSet: VM type       = 64-bit
17/10/13 09:00:08 INFO util.GSet: 1.0% max memory 889 MB = 8.9 MB
17/10/13 09:00:08 INFO util.GSet: capacity      = 2^20 = 1048576 entries
17/10/13 09:00:08 INFO namenode.FSDirectory: ACLs enabled? false
17/10/13 09:00:08 INFO namenode.FSDirectory: XAttrs enabled? true
17/10/13 09:00:08 INFO namenode.NameNode: Caching file names occurring more than 10 times
17/10/13 09:00:08 INFO util.GSet: Computing capacity for map cachedBlocks
17/10/13 09:00:08 INFO util.GSet: VM type       = 64-bit
17/10/13 09:00:08 INFO util.GSet: 0.25% max memory 889 MB = 2.2 MB
17/10/13 09:00:08 INFO util.GSet: capacity      = 2^18 = 262144 entries
17/10/13 09:00:08 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
17/10/13 09:00:08 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
17/10/13 09:00:08 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension     = 30000
17/10/13 09:00:08 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.window.num.buckets = 10
17/10/13 09:00:08 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.num.users = 10
17/10/13 09:00:08 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.windows.minutes = 1,5,25
17/10/13 09:00:08 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
17/10/13 09:00:08 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
17/10/13 09:00:08 INFO util.GSet: Computing capacity for map NameNodeRetryCache
17/10/13 09:00:08 INFO util.GSet: VM type       = 64-bit
17/10/13 09:00:08 INFO util.GSet: 0.029999999329447746% max memory 889 MB = 273.1 KB
17/10/13 09:00:08 INFO util.GSet: capacity      = 2^15 = 32768 entries
17/10/13 09:00:28 WARN net.DNS: Unable to determine local hostname -falling back to "localhost"
java.net.UnknownHostException: ubuntu: ubuntu: Name or service not known
        at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
        at org.apache.hadoop.net.DNS.resolveLocalHostname(DNS.java:284)
        at org.apache.hadoop.net.DNS.<clinit>(DNS.java:61)
        at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:991)
        at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:600)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:152)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1102)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1544)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1671)
Caused by: java.net.UnknownHostException: ubuntu: Name or service not known
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
        at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
        ... 8 more
17/10/13 09:00:48 WARN net.DNS: Unable to determine address of the host-falling back to "localhost" address
java.net.UnknownHostException: ubuntu: ubuntu: Name or service not known
        at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
        at org.apache.hadoop.net.DNS.resolveLocalHostIPAddress(DNS.java:307)
        at org.apache.hadoop.net.DNS.<clinit>(DNS.java:62)
        at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:991)
        at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:600)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:152)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1102)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1544)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1671)
Caused by: java.net.UnknownHostException: ubuntu: Name or service not known
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
        at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
        ... 8 more
17/10/13 09:00:48 INFO namenode.FSImage: Allocated new BlockPoolId: BP-966861352-127.0.0.1-1507852848831
17/10/13 09:00:48 INFO common.Storage: Storage directory /tmp/hadoop-hadoop-user/dfs/name has been successfully formatted.
17/10/13 09:00:48 INFO namenode.FSImageFormatProtobuf: Saving image file /tmp/hadoop-hadoop-user/dfs/name/current/fsimage.ckpt_0000000000000000000 using no compression
17/10/13 09:00:48 INFO namenode.FSImageFormatProtobuf: Image file /tmp/hadoop-hadoop-user/dfs/name/current/fsimage.ckpt_0000000000000000000 of size 327 bytes saved in 0 seconds.
17/10/13 09:00:48 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
17/10/13 09:00:48 INFO util.ExitUtil: Exiting with status 0
17/10/13 09:00:48 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at java.net.UnknownHostException: ubuntu: ubuntu: Name or service not known
************************************************************/
 

* 증상은 64라인 이하에 있습니다.

* 해당 원인은 /etc/hosts 파일에 호스트명이 localhost 로 지정되어 있어서 발생하고 있었으며 다른 호스트명으로 수정하면 됩니다.

127.0.0.1       localhost
#127.0.1.1      ubuntu.localdomain      ubuntu
 
# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
 
192.168.30.128 localhost