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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:
--------------------------
Description:
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.
was:
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.
Instead of cloning via XMLEncoder, it is faster to use BeanUtils.cloneBean()
which is following same data paths (get/set bean methods) instead.
> 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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