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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3369) Fast block processing during name-node startup.
Date Sat, 10 May 2008 00:43:55 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HADOOP-3369:
----------------------------------------

    Hadoop Flags: [Reviewed]
          Status: Patch Available  (was: Open)

> Fast block processing during name-node startup.
> -----------------------------------------------
>
>                 Key: HADOOP-3369
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3369
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.18.0
>
>         Attachments: fastBlockReports.patch, fastBlockReports.patch
>
>
> The block report processing during the startup period should be optimized.
> As noted in HADOOP-3022 during cluster startup all blocks are under-replicated 
> because they have not been reported by name-nodes yet.
> Currently, we routinely move blocks to the neededReplications queue when they
> are first reported and then remove them from the list when other nodes report it.
> In ideal situation we end up adding all blocks into neededReplications queue first
> only in order to remove all of them in the end. 

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