Skip to content

Latest commit

 

History

History
315 lines (210 loc) · 8.77 KB

README.md

File metadata and controls

315 lines (210 loc) · 8.77 KB

HDFS and HADOOP

First check how many nodes are running

> hadoop dfsadmin -report

WARNING: Use of this script to execute dfsadmin is deprecated.
WARNING: Attempting to execute replacement "hdfs dfsadmin" instead.

Configured Capacity: 0 (0 B)
Present Capacity: 0 (0 B)
DFS Remaining: 0 (0 B)
DFS Used: 0 (0 B)
DFS Used%: 0.00%
Replicated Blocks:
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
Low redundancy blocks with highest priority to recover: 0
Pending deletion blocks: 0
Erasure Coded Block Groups:
Low redundancy block groups: 0
Block groups with corrupt internal blocks: 0
Missing block groups: 0
Low redundancy blocks with highest priority to recover: 0
Pending deletion blocks: 0

------------------------------------------------- 

Check ports

>netstat -ntlp

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:9000          0.0.0.0:*               LISTEN      274/java
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      -
tcp        0      0 0.0.0.0:9868            0.0.0.0:*               LISTEN      600/java
tcp        0      0 0.0.0.0:9870            0.0.0.0:*               LISTEN      274/java
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      15/sshd
tcp6       0      0 :::22                   :::*                    LISTEN      15/sshd

HttpFS server, the HDFS HTTP Gateway

> hdfs httpfs

Clean the name

sudo rm -R /tmp/*

format the namenode

hdfs namenode -format

IDE setup for a hadoop project

Project setup

project setup

modules

modules

libraries

libraries

JDK

jdk

artifacts

artifacts

output jar

jar

Configuration for hadoop hdfs on win 10

Hadoop configurations involves Core, YARN, MapReduce, HDFS configurations. Note win10 has a bug on posix in hadoop source code https://issues.apache.org/jira/browse/HDFS-14890

core-site.xml

> notepad .\etc\hadoop\core-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<configuration>
<property>
	<name>fs.default.name</name>
	<value>hdfs://localhost:9000</value>
 </property>
</configuration>

hdfs-site.xml

Before adding teh conf make sure you have the folder

>ls .\big-data\data\dfs
	Directory: C:\Users\abisht\big-data\data\dfs
Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----          5/3/2022   7:31 AM                data
d-----          5/3/2022   7:30 AM                namespace_logs

Then edit the conf file for hdfs

<configuration>
   <property>
	 <name>dfs.replication</name>
	 <value>1</value>
   </property>
   <property>
	 <name>dfs.namenode.name.dir</name>
	 <value>file:///C:/Users/abisht/big-data/data/dfs/namespace_logs</value>
   </property>
   <property>
	 <name>dfs.datanode.data.dir</name>
	 <value>file:///C:/USers/abisht/big-data/data/dfs/data</value>
   </property>
</configuration>

mapred-site.xml

Configure MapReduce

<configuration>
	<property>
		<name>mapreduce.framework.name</name>
		<value>yarn</value>
	</property>
	<property> 
		<name>mapreduce.application.classpath</name>
		<value>%HADOOP_HOME%/share/hadoop/mapreduce/*,%HADOOP_HOME%/share/hadoop/mapreduce/lib/*,%HADOOP_HOME%/share/hadoop/common/*,%HADOOP_HOME%/share/hadoop/common/lib/*,%HADOOP_HOME%/share/hadoop/yarn/*,%HADOOP_HOME%/share/hadoop/yarn/lib/*,%HADOOP_HOME%/share/hadoop/hdfs/*,%HADOOP_HOME%/share/hadoop/hdfs/lib/*</value>
	</property>
</configuration>

yarn-site.xml

<configuration>
 <property>
		<name>yarn.nodemanager.aux-services</name>
		<value>mapreduce_shuffle</value>
	</property>
	<property>
		<name>yarn.nodemanager.env-whitelist</name>
		<value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
	</property>
</configuration>

IDE to docker container hosting hadoop

Copying jar to docker

docker cp IndexLocator.jar bda:/hadoop-data

Formatting Namenode

hadoop namenode -format

Launching Hadoop

start-all.cmd

This will open 4 new cmd windows running 4 different Daemons of hadoop:-

  • Namenode
  • Datanode
  • Resourcemanager
  • Nodemanager

Running Hadoop

hadoop jar <name of jar> <input folder created by hdfs arg1> <output folder agr2>

Web UIs

Namenode localhost:50070

Resourcemanger localhost:8088

Datanode http://localhost:9864/datanode.html

Elastic MapReduce (EMR)

1: Develop a MapReduce Java Program

2 : AWs account creation

3 : Upload the JAR and input files to Amazon S3

4: Run an elastic MapReduce job

  • Go to the Elastic MapReduce (EMR) service in AWS. From the control panel there, click the “Create cluster” button.
  • on the first configuration screen, click “Go to advanced options”
  • On the “Step 1: Software and Steps” page (“Software Configuration”)
    • Select Release “emr-6.5.0”. Leave all the default services checked
    • Under “Steps (optional)”, do the following things Check “Cluster auto-terminates” for the item “After last step completes”. Choose “Step type” as “Custom JAR” – provide name , location and arguments from s3
    • after being done configuring the Custom JAR, click “Add”.
  • On the “Step 2: Hardware” page (Hardware Configuration),
    • instance m5.xlarge is one of the Amazon EC2 instances
    • select master node , worker ( core ) nodes and atsks
  • on "Step 3: General Cluster Settings” page (General Options), give your cluster a name.
  • On the “Step 4: Security” page (Security Options , give a key pair

References

Debugging

Issue1 space issues

solution check free space available

> free -m
    total        used        free      shared  buff/cache   available
Mem:           6265        1407        2788         366        2069        4213
Swap:          2048           0        2048



> hdfs dfs -df
Filesystem             Size  Used  Available  Use%
hdfs://localhost:9000     0     0          0  NaN%

Issue2 safe mode probnlems

# hadoop fs -mkdir /exercise/reviews
mkdir: Cannot create directory /exercise/reviews. Name node is in safe mode.

Solution CHECK THE name node status

> hdfs dfsadmin -safemode get
Safe mode is ON

Leave the safe mode

> hdfs dfsadmin -safemode leave
Safe mode is OFF

Enter in SAFE MODE:

> hdfs dfsadmin -safemode enter

Issue 3 Corrupted spaces

solution For corrupted blocks, you can have a look at output of this command:

hdfs fsck -list-corruptfileblocks

And try to delete corrupted blocks using:

hdfs fsck / -delete

Issue 4 IO Exception in put

._COPYING_ could only be written to 0 of the 1 minReplication nodes. There are 0 datanode(s) running and 0 node(s) are excluded in this operation.

solution check the configuration of master and slave nmodes

> cat /etc/hosts

127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2      2e2f6c19ed60

If none found than stop and start data nodes > /opt/hadoop-3.2.1/sbin/stop-all.sh

Stopping namenodes on [localhost]
Stopping datanodes
Stopping secondary namenodes [2e2f6c19ed60]
Stopping nodemanagers
Stopping resourcemanager

> /opt/hadoop-3.2.1/sbin/start-dfs.sh

Starting namenodes on [localhost]
Starting datanodes
Starting secondary namenodes [2e2f6c19ed60]

Alternatively you can start data node using hdfs

> hdfs --daemon start datanode 

Issue 5 Incompatiable cluster Id

2022-04-17 18:00:33,442 WARN common.Storage: Failed to add storage directory [DISK]file:/tmp/hadoop-root/dfs/data

java.io.IOException: Incompatible clusterIDs in /tmp/hadoop-root/dfs/data: namenode clusterID = CID-01feef3c-4682-41cb-a90c-7e0f53eabffb; datanode clusterID = CID-c806df05-af30-4945-9c97-d14c0cda1ab3

solution