[jira] [Created] (TAJO-149) Eliminate QueryConf and its file write

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-149:
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             Summary: 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


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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