I want to know the steps to Configure java heap with new generation heap and max new gen heap for Namenode heap size in the hortonworks

[#1]

@Rahul Gupta

From Ambari UI --> HDFS --> Configs --> Advanced --> NameNode --> NameNode New Generation Size & NameNode maximum new generation size

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[#2]

Thanks Jay.

I am confused to set the parameters into the Ambari.

Lets, the already set parameter into the Ambari is below:

Now I want to set the new parameters, Condition below:

a) Namenode is going to have more than 8 million files

So, I need to configure java heap with new generation heap and max new gen heap for Namenode heap size.

[#3 · Accepted solution]

@Rahul Gupta

You can refer to the following Doc to know the NameNode Heap recommendations based on number of files;

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.4.0/bk_installing_manually_book/content/ref-809...

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[#4]

Thanks Jay,

But I am but confused to fill the values in below fields.

Can you help me please for it,

NameNode new generation size =? MB

NameNode maximum new generation size = ? MB

NameNode permanent generation size = ? MB

NameNode maximum permanent generation size = ? MB

[#5]

@Rahul Gupta

You can set:

NameNode new generation size = 768
NameNode maximum new generation size = 768

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Permanent Generation values you can leave default. Because from JDK 1.8 onwards there is no concept of Permanent Generation it is replaced with the MetaSpace.

https://dzone.com/articles/java-8-permgen-metaspace

[#6]

Thanks Jay