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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-626) Use Visitor pattern in MetaRegion to reduce code clones in HTable and HConnectionManager
Date Fri, 16 May 2008 21:13:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597615#action_12597615
] 

stack commented on HBASE-626:
-----------------------------

The NINEs trick composing the startrow key to use finding meta region has been dropped.  Makes
me nervous... might work in tests but not in the real world.

> Use Visitor pattern in MetaRegion to reduce code clones in HTable and HConnectionManager
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-626
>                 URL: https://issues.apache.org/jira/browse/HBASE-626
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Minor
>             Fix For: 0.2.0
>
>         Attachments: hbase-626-v1.patch, hbase-626-v2.patch
>
>
> HTable and HConnectionManager.TableServers both scan the meta region in the same way
(but the later also retry one time if it fails). A Visitor pattern should be used in a new
scanning method in MetaRegion to accept visitors that gather information such as region names
for a table or the list of all tables.

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