In high distributed, scaled applications , One System/Server needs to connect another Downstream System/Server to establish session, certificates,
Here session/certificates are having random numbers,
Our java security pickup the random number from Linux/Window entropy pool.
What is entropy pool ?
In any server, user hits the server through keyboard some other noises, Linux server capture those noises put them into entropy pool.
EGD - Entropy Gathered Device
our java security device -> java.security.egd=file:/dev/random
java.security.egd=file:/dev/random
By default java8 and java11 this property is there in the java.security file,
If entropy pool having full entries, file:/dev/random works fine,
If entropy pool having no entries, file:/dev/random will waits for long time, it is blocking the thread, it is hitting the performance.
Solution: Always use the java.security.egd=file:/dev/urandom in PCF/Kubernets/Virtual Server.
java.security.egd=file:/dev/urandom
need to pass this argument in java argument.
If entropy pool having full entries, file:/dev/urandom works fine,
If entropy pool having no entries, file:/dev/urandom will not wait, it will genereate the random number hence it will improve the performance, no blocking of the thread.
