question Re: JVM memory settings - Bootstrap.conf reset config in Archives of Support Questions (Read Only)

JVM memory settings - Bootstrap.conf reset config

yjabbary — Tue, 21 Apr 2026 12:17:22 GMT

Hi,

I downloaded HDF 3.1 and i get NIFI java.lang.OutOfMemoryError: Java heap space after running my custom processor,

I changed the default JVM memory in Bootstrap.conf from -Xms512m -Xmx512m to -Xms1g -Xmx1g and i restarted NiFi to take the new values but when i check Bootstrap.conf after restarting NiFi it reset the values to -Xms512m -Xmx512m. why it reset the values to the old values and it didn't take the new values.

Your help is highly appreciated.

Re: JVM memory settings - Bootstrap.conf reset config

jsensharma — Thu, 31 May 2018 21:18:05 GMT

@yazeed salem

If you will make changed in the script/conf files manually then upon every restart of Nifi (via Ambari UI/API call) the content of the file will be overwritten.

So can check the template here and should make changes from Ambari UI like.

Ambari UI --> Nifi --> Configs --> Advanced --> "Advanced nifi-bootstrap-env" --> "Template for bootstrap.conf"

Try changing the template snippet as following:

From:

# JVM memory settings
java.arg.2=-Xms{{nifi_initial_mem}}
java.arg.3=-Xmx{{nifi_max_mem}}

# JVM memory settings
java.arg.2=-Xms1G
java.arg.3=-Xmx1G

Then restart NiFi

Re: JVM memory settings - Bootstrap.conf reset config

yjabbary — Mon, 04 Jun 2018 14:49:48 GMT

Excellent. it works.

Thanks Mr. Jay