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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