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Posted to issues@kylin.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2018/08/11 22:42:01 UTC
[jira] [Updated] (KYLIN-3317) Replace UUID.randomUUID with
deterministic PRNG
[ https://issues.apache.org/jira/browse/KYLIN-3317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Yu updated KYLIN-3317:
--------------------------
Description:
Currently UUID.randomUUID is called in various places in the code base.
* It is non-deterministic.
* It uses a single secure random for UUID generation. This uses a single JVM wide lock, and this can lead to lock contention and other performance problems.
We should move to something that is deterministic by using seeded PRNGs
{code}
new UUID(ThreadLocalRandom.current().nextLong(), ThreadLocalRandom.current().nextLong())
{code}
was:
Currently UUID.randomUUID is called in various places in the code base.
* It is non-deterministic.
* It uses a single secure random for UUID generation. This uses a single JVM wide lock, and this can lead to lock contention and other performance problems.
We should move to something that is deterministic by using seeded PRNGs
{code}
new UUID(ThreadLocalRandom.current().nextLong(), ThreadLocalRandom.current().nextLong())
{code}
> Replace UUID.randomUUID with deterministic PRNG
> -----------------------------------------------
>
> Key: KYLIN-3317
> URL: https://issues.apache.org/jira/browse/KYLIN-3317
> Project: Kylin
> Issue Type: Task
> Components: Security
> Reporter: Ted Yu
> Assignee: jiatao.tao
> Priority: Major
> Fix For: v2.5.0
>
>
> Currently UUID.randomUUID is called in various places in the code base.
> * It is non-deterministic.
> * It uses a single secure random for UUID generation. This uses a single JVM wide lock, and this can lead to lock contention and other performance problems.
> We should move to something that is deterministic by using seeded PRNGs
> {code}
> new UUID(ThreadLocalRandom.current().nextLong(), ThreadLocalRandom.current().nextLong())
> {code}
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