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Posted to issues@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2015/07/17 19:50:05 UTC

[jira] [Updated] (HIVE-11291) Avoid allocation storm while doing rule matching on operator/expression trees

     [ https://issues.apache.org/jira/browse/HIVE-11291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan updated HIVE-11291:
------------------------------------
    Attachment: HIVE-11291.patch

In most cases, we are trying to do exact matches, regex matching is not required.
[~hsubramaniyan] Can you take a look?

> Avoid allocation storm while doing rule matching on operator/expression trees
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-11291
>                 URL: https://issues.apache.org/jira/browse/HIVE-11291
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-11291.patch
>
>
> RuleRegExMatch repeatedly allocates string while trying to find a matching pattern. This results in huge GC churn for large trees.



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