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https://issues.apache.org/jira/browse/TAJO-149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-149:
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Attachment: TAJO-149_2.patch
Thank you for the review. I've uploaded the updated patch.
> Eliminate QueryConf and its file write
> --------------------------------------
>
> Key: TAJO-149
> URL: https://issues.apache.org/jira/browse/TAJO-149
> Project: Tajo
> Issue Type: Improvement
> Components: master, worker
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Fix For: 0.2-incubating
>
> Attachments: TAJO-149_2.patch, TAJO-149.patch
>
>
> QueryConf is a subclass of org.apache.hadoop.conf.Configuration. This has a
> similar mechanism of JobConf of MapReduce. It has overheads and too big to be
> distributed across a number of nodes. I've added QueryMeta to the patch of
> TAJO-144. QueryMeta contains a set of key-value pairs and is based on
> protobuf. Since QueryMeta is a wrapper class of a protobuf message and will
> contain only specific information for each query, it will be very lightweight
> and is easy to be disseminated across a number of nodes.
> In this issue, we will replace QueryConf by QueryMeta, and we will eliminate
> the part where QueryConf is written as a xml file on HDFS.
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