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https://issues.apache.org/jira/browse/HADOOP-158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko resolved HADOOP-158.
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Resolution: Duplicate
> dfs should allocate a random blockid range to a file, then assign ids
> sequentially to blocks in the file
> --------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-158
> URL: https://issues.apache.org/jira/browse/HADOOP-158
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.1.0
> Reporter: Doug Cutting
> Assignee: Konstantin Shvachko
>
> A random number generator is used to allocate block ids in dfs. Sometimes a
> block id is allocated that is already used in the filesystem, which causes
> filesystem corruption.
> A short-term fix for this is to simply check when allocating block ids
> whether any file is already using the newly allocated id, and, if it is,
> generate another one. There can still be collisions in some rare conditions,
> but these are harder to fix and will wait, since this simple fix will handle
> the vast majority of collisions.
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