As i am in learning phase of Hadoop, I am having a problem with Hadoop single cluster setup. I am using Hadoop 2.9.0 and Java 8. I have completed the setup and it is as below
core-site.xml
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/ubuntu/hadooptmp/hadoop-${user.name}</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>
mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>localhost:9001</value>
</property>
</configuration>
yarn-site.xml
<configuration>
<!-- Site specific YARN configuration properties -->
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>
hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property><name>dfs.name.dir</name>
<value>file:///home/ubuntu/hadoop/hdfs/namenode</value>
<final>true</final>
</property>
<property>
<name>dfs.data.dir</name>
<value>file:///home/ubuntu/hadoop/hdfs/datanode</value>
<final>true</final>
</property>
</configuration>
Now the value of dfs.replication in hdfs-site.xml is 1. Now I am doing start-all.sh and if i check status -
7536 ResourceManager
7025 NameNode
7378 SecondaryNameNode
8147 Jps
7667 NodeManager
Now I have stop-all.sh and if i change the value of dfs.replication in hdfs-site.xml to 0(some people mentioned this as solution), and again start-all.sh. Status is -
9024 DataNode
9362 ResourceManager
9493 NodeManager
9815 Jps
As we can see Name node stopped running in this case. I have tried formatting both but did not work out. I not understanding what I am doing wrong in setup that I am unable to run Namenode and datanode simultaneously.
I have done all the single cluster setup on aws ubuntu server. I have tried giving value of mapreduce.framework.name in mapred-site.xml as "yarn" but did not helped. Please let me know if there is a solution for this.
Datanode log added below
2018-08-23 15:08:14,494 INFO org.apache.hadoop.hdfs.server.common.Storage: Using 1 threads to upgrade data directories (dfs.datanode.parallel.volumes.load.threads.num=1, dataDirs=1)
2018-08-23 15:08:14,506 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/ubuntu/hadoop/hdfs/datanode/in_use.lock acquired by nodename [email protected]
2018-08-23 15:08:14,509 WARN org.apache.hadoop.hdfs.server.common.Storage: Failed to add storage directory [DISK]file:/home/ubuntu/hadoop/hdfs/datanode/
java.io.IOException: Incompatible clusterIDs in /home/ubuntu/hadoop/hdfs/datanode: namenode clusterID = CID-e5d9317d-7c4d-40eb-8fa2-030c5a8cfad6; datanode clusterID = CID-f416763a-ed6f-41d7-8b9d-12c298c5d779
at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:760)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadStorageDirectory(DataStorage.java:293)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadDataStorage(DataStorage.java:409)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.addStorageLocations(DataStorage.java:388)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:556)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1649)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1610)
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:374)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:280)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:816)
at java.lang.Thread.run(Thread.java:748)
2018-08-23 15:08:14,516 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399) service to localhost/127.0.0.1:9000. Exiting.
java.io.IOException: All specified directories have failed to load.
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:557)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1649)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1610)
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:374)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:280)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:816)
at java.lang.Thread.run(Thread.java:748)
2018-08-23 15:08:14,516 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399) service to localhost/127.0.0.1:9000
2018-08-23 15:08:14,518 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399)
2018-08-23 15:08:16,520 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2018-08-23 15:08:16,531 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at ip-172-31-29-76.us-east-2.compute.internal/172.31.29.76
