[jira] Commented: (HIVE-1778) simultaneously launched queries collide on hive intermediate directories

["Edward Capriolo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968834#action_12968834 ] 

Edward Capriolo commented on HIVE-1778:
---------------------------------------

Joydeep,

Do you want to use SecureRandom or possibly use an internal static counter for these ids?

> simultaneously launched queries collide on hive intermediate directories
> ------------------------------------------------------------------------
>
>                 Key: HIVE-1778
>                 URL: https://issues.apache.org/jira/browse/HIVE-1778
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Joydeep Sen Sarma
>            Assignee: Edward Capriolo
>
> we saw one instance of multiple queries for the same user launched in parallel (from a workflow engine) use the same intermediate directories. which is obviously super bad but not suprising considering how we allocate them:
>    Random rand = new Random();
>   String executionId = "hive_" + format.format(new Date()) + "_"  + Math.abs(rand.nextLong());
>  Java documentation says: Two Random objects created within the same millisecond will have the same sequence of random numbers.

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