How and where we can increase min and max heap size during edge server installation.

[#1]

We were installing Gateway we got the error "Error occurred during initialization of VM.Minimum heap size (-Xms) specified to be larger than max heap size (-Xmx)", there is one service which did not start "apigee-cassandra"

I changed the min and max heap size of "cassandra-env.sh file at path "/opt/apigee/apigee-cassandra/conf" and it started working. But we hardcoded it which i am not sure correct or not.

I have attached the file here itself (changed the extension from ".sh" to ".txt".)

[venkataraghavan]

@Bharti Sharma

The Xmx and Xms are calculated based on MAX_HEAP_SIZE. There is an internal logic based on which the MAX_HEAP_SIZE is calculated which is :

# max(min(1/2 ram, 1024MB),

# min(1/4 ram, 8GB))

# calculate 1/2 ram and cap to 1024MB

# calculate 1/4 ram and cap to 8192MB

# pick the max

So it is not necessary for either of Xms or Xmx to be hardcoded and it is not advisable to do so.

You can choose to over-ride the calculated values, but please ensure that you do so as below :

"Override these to set the amount of memory to allocate to the JVM at # start-up. For production use you may wish to adjust this for your # environment.

MAX_HEAP_SIZE is the total amount of memory dedicated # to the Java heap; HEAP_NEWSIZE refers to the size of the young # generation.

Both MAX_HEAP_SIZE and HEAP_NEWSIZE should be either set # or not (if you set one, set the other)."

The above section is available as a quote in the cassandra-env.sh