Daryn Sharp created HADOOP-15811:
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Summary: Optimizations for Java's TLS performance
Key: HADOOP-15811
URL: https://issues.apache.org/jira/browse/HADOOP-15811
Project: Hadoop Common
Issue Type: Bug
Components: common
Affects Versions: 1.0.0
Reporter: Daryn Sharp
Java defaults to using /dev/random and disables intrinsic methods used in hot
code paths. Both cause highly synchronized impls to be used that significantly
degrade performance.
* -Djava.security.egd=file:/dev/urandom
* -XX:+UseMontgomerySquareIntrinsic
* -XX:+UseMontgomeryMultiplyIntrinsic
* -XX:+UseSquareToLenIntrinsic
* -XX:+UseMultiplyToLenIntrinsic
These settings significantly boost KMS server performance. Under load, threads
are not jammed in the SSLEngine.
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