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Posted to common-issues@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2019/02/20 23:15:00 UTC
[jira] [Commented] (HADOOP-15811) Optimizations for Java's TLS
performance
[ https://issues.apache.org/jira/browse/HADOOP-15811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773494#comment-16773494 ]
Wei-Chiu Chuang commented on HADOOP-15811:
------------------------------------------
Hmm. on 8u181, I am not seeing much different after applying the configs.
> 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
> Priority: Major
>
> 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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