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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1283) Eliminate internal UTF8 to String and vice versa conversions in the name-node.
Date Thu, 21 Jun 2007 02:29:26 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HADOOP-1283:
----------------------------------------

    Status: Patch Available  (was: Open)

> Eliminate internal UTF8 to String and vice versa conversions in the name-node.
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-1283
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1283
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.12.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: EliminateUTF8-2.patch, EliminateUTF8.patch
>
>
> We have internal conversions of those two types inside name-node code. One example:
> NameNode.complete(String src, String clientName)
> then it calls
> FSNamesystem.completeFile(new UTF8(src), new UTF8(clientName));
> which in turn finally calls
> FSDirectory.addNode(path.toString(), newNode )
> and in another place
> FSDirectory.getNode(src.toString())
> So we have several conversions of the same parameter back and forth during computation.
> We should keep the parameter type consistent within different methods.
> The question is, which type should be used: String or Text.
> From previous discussions I remember that Text is more efficient in space and time for
non ASCII
> data. Here we mostly deal with file names and network addresses, which are ASCII.
> Does it make sense to use Text in this case?
> UTF8 is also used as a key in two maps: pendingCreates and leases.
> This should be replaced too.

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