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From "Jinho Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-149) Eliminate QueryConf and its file write
Date Mon, 09 Sep 2013 01:48:51 GMT

    [ https://issues.apache.org/jira/browse/TAJO-149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13761564#comment-13761564

Jinho Kim commented on TAJO-149:


Looks great for me. but I getting following error.
java.lang.IllegalStateException: staging must be set before starting a Tajo Cluster starts
	at com.google.common.base.Preconditions.checkState(Preconditions.java:149)
	at org.apache.tajo.conf.TajoConf.getStagingRoot(TajoConf.java:370)
	at org.apache.tajo.master.TajoMaster.checkAndInitializeSystemDirectories(TajoMaster.java:201)
	at org.apache.tajo.master.TajoMaster.init(TajoMaster.java:123)
	at org.apache.tajo.TajoTestingCluster.startMiniTajoCluster(TajoTestingCluster.java:271)
	at org.apache.tajo.TajoTestingCluster.startMiniCluster(TajoTestingCluster.java:386)
	at org.apache.tajo.TajoTestingCluster.startMiniCluster(TajoTestingCluster.java:351)
	at org.apache.tajo.LocalTajoTestingUtility.setup(LocalTajoTestingUtility.java:53)
	at org.apache.tajo.TpchTestBase.setUp(TpchTestBase.java:94)
	at org.apache.tajo.TpchTestBase.<clinit>(TpchTestBase.java:51)
> 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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