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Posted to dev@hive.apache.org by "Joydeep Sen Sarma (JIRA)" <ji...@apache.org> on 2010/11/09 02:00:19 UTC
[jira] Created: (HIVE-1778) simultaneously launched queries collide
on hive intermediate directories
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
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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[jira] Assigned: (HIVE-1778) simultaneously launched queries
collide on hive intermediate directories
Posted by "Edward Capriolo (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Edward Capriolo reassigned HIVE-1778:
-------------------------------------
Assignee: Edward Capriolo
> 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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[jira] Commented: (HIVE-1778) simultaneously launched queries
collide on hive intermediate directories
Posted by "Bennie Schut (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969227#action_12969227 ]
Bennie Schut commented on HIVE-1778:
------------------------------------
Perhaps related to HIVE-1019 In that case we use aa UUID which works great for this stuff.
> 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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[jira] Commented: (HIVE-1778) simultaneously launched queries
collide on hive intermediate directories
Posted by "Joydeep Sen Sarma (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968859#action_12968859 ]
Joydeep Sen Sarma commented on HIVE-1778:
-----------------------------------------
whatever works - we could pass in hash the query string and time (perhaps a nanosecond timer) to come up with a better seed for the random generator for example.
> 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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[jira] Commented: (HIVE-1778) simultaneously launched queries
collide on hive intermediate directories
Posted by "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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You can reply to this email to add a comment to the issue online.