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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-898) Sequential generation of block ids
Date Sat, 18 Jun 2011 01:57:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo (Nicholas), SZE updated HDFS-898:

    Attachment: blockid.tex

Let n be the number of bits used for storing block ID. Let m be the number of existing blocks
such that their ID are distinct. Now, remove the first b bits from the block IDs. What is
the probability, p(n; m; b), that all the block IDs remain distinct?

See blockid20100122.pdf.

> 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
>             Fix For: 0.23.0
>         Attachments: DuplicateBlockIds.patch, FreeBlockIds.pdf, HighBitProjection.pdf,
blockid.tex, blockid20100122.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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