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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TAJO-149) Eliminate QueryConf and its file write
Date Fri, 06 Sep 2013 13:50:52 GMT

     [ https://issues.apache.org/jira/browse/TAJO-149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hyunsik Choi updated TAJO-149:
------------------------------

    Attachment: TAJO-149.patch

I've uploaded the patch. This patch primarily eliminates QueryConf and its write on HDFS.
Instead, Tajo uses a global system configuration file stored on system directory. I've described
the system directory in more detail at https://wiki.apache.org/tajo/TajoInternal#DirectoryHierarchy

In addition, it cleans up the below things:
* Clean up the system directory hierarchy as you can see the above link.
* Remove all code parts using TableMeta files (.meta) stored on each table directory.
* Clean up the TajoMaster init() and start() methods.
* Clean up the succeeded event part of Query.
                
> 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.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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