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https://issues.apache.org/jira/browse/HBASE-3417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977943#action_12977943
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Jonathan Gray commented on HBASE-3417:
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One idea from discussion with stack is to use a UUID for the filename. That
way we can generate it once for the temporary file and then just move it in
place without doing a rename. Would then just use UUID + blockNumber as the
blockName.
> CacheOnWrite is using the temporary output path for block names, need to use
> a more consistent block naming scheme
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-3417
> URL: https://issues.apache.org/jira/browse/HBASE-3417
> Project: HBase
> Issue Type: Bug
> Components: io, regionserver
> Affects Versions: 0.92.0
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Priority: Critical
> Fix For: 0.92.0
>
>
> Currently the block names used in the block cache are built using the
> filesystem path. However, for cache on write, the path is a temporary output
> file.
> The original COW patch actually made some modifications to block naming stuff
> to make it more consistent but did not do enough. Should add a separate
> method somewhere for generating block names using some more easily mocked
> scheme (rather than just raw path as we generate a random unique file name
> twice, once for tmp and then again when moved into place).
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