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https://issues.apache.org/jira/browse/HDFS-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839805#action_12839805
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Dmytro Molkov commented on HDFS-898:
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I just ran a tool on FB cluster. Here is the output:
Bit map applied: ff00000000000000
Number of collisions = 0
=====================
Number of blocks = 57909756
Number of negtive ids = 57909756
Number of positive ids = 0
Largest segment = (-277768208, 9223372036854775807)
Segment size = 9.223372037132544E18
Expected max = 318542942464
> 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, FreeBlockIds.pdf,
> 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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