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https://issues.apache.org/jira/browse/HIVE-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-4078:
--------------------------
Release Note: Create a copy of the MapredWork only if a conditional task is
involved and avoid the copy if the task is non-conditional (was: Clone map-red
work using a faster BeanUtils.cloneBean() during mapjoin conversion)
> Delay the serialize-deserialize pair in CommonJoinResolver
> ----------------------------------------------------------
>
> Key: HIVE-4078
> URL: https://issues.apache.org/jira/browse/HIVE-4078
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-4078-20130227.patch, HIVE-4078-20130305.patch,
> HIVE-4078.patch
>
>
> CommonJoinProcessor tries to clone a MapredWork while attempting a conversion
> to a map-join
> {code}
> // deep copy a new mapred work from xml
> InputStream in = new ByteArrayInputStream(xml.getBytes("UTF-8"));
> MapredWork newWork = Utilities.deserializeMapRedWork(in,
> physicalContext.getConf());
> {code}
> which is a very heavy operation memory wise & cpu-wise.
> It would be better to do this only if a conditional task is required,
> resulting in a copy of the task.
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