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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-898) Sequential generation of block ids
Date Fri, 05 Feb 2010 08:30:28 GMT

    [ https://issues.apache.org/jira/browse/HDFS-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829998#action_12829998
] 

Konstantin Shvachko commented on HDFS-898:
------------------------------------------

Yes the birthday problem is similar, but not the same. In BDP you project yyyy/mm/dd to yyyy.

But in BDP years are arbitrary, while in our case yyyy-s are limited to a certain number as
Nicholas mentioned. 
Also birthdays do not uniquely identify a person, while in our case all blocks have unique
ids.

> Sequential generation of block ids
> ----------------------------------
>
>                 Key: HDFS-898
>                 URL: https://issues.apache.org/jira/browse/HDFS-898
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.20.1
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.22.0
>
>         Attachments: DuplicateBlockIds.patch, HighBitProjection.pdf
>
>
> This is a proposal to replace random generation of block ids with a sequential generator
in order to avoid block id reuse in the future.

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