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From "Jihoon Son (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-178) Implements StorageManager for Vectorized Engine
Date Thu, 12 Sep 2013 02:59:57 GMT

    [ https://issues.apache.org/jira/browse/TAJO-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765121#comment-13765121
] 

Jihoon Son commented on TAJO-178:
---------------------------------

Yes, so my question is how the new storage manager supports vectorized engine.
It seems that the above columnar interface will be added after the new storage manager is
implemented, right?
                
> Implements StorageManager for Vectorized Engine
> -----------------------------------------------
>
>                 Key: TAJO-178
>                 URL: https://issues.apache.org/jira/browse/TAJO-178
>             Project: Tajo
>          Issue Type: Improvement
>          Components: storage
>    Affects Versions: 0.2-incubating
>            Reporter: hyoungjunkim
>            Assignee: hyoungjunkim
>         Attachments: TAJO-178_1.path, TAJO-178.path, tajo_storage_manager.png
>
>
> The current StorageManager does not provide scan scheduling function. All scan operations
run concurrently. This is the cause of random disk access and disk read performance is not
good.
> The proposed StorageManager is based on double buffering. Each disk has a scheduler to
schedule by order of scanned adjust. Each Scanner has a InputStream and a Tuple pool. The
next() operation of ScanNode is blocked until Tuple pool is filled. Assigned Scanner by the
scheduler read data(xMB) and fills Tuple Pool and notifies to next() operation. After scanning
Scanner re-enter DiskScanQueue.
> In this way Scanner can pass column vector to Vectorized Query Engine.
> See the attached file.

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