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https://issues.apache.org/jira/browse/HADOOP-9371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613654#comment-13613654
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Steve Loughran commented on HADOOP-9371:
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I've just published a copy of my branch of hadoop-trunk with this patch to
github
This has auto rendering of the [MD
file|https://github.com/steveloughran/hadoop-trunk/blob/stevel/HADOOP-9361-filesystem-contract/hadoop-common-project/hadoop-common/src/site/markdown/filesystem-contract.md]
I've merged in Mike's and Matt's comments already.
Matt: that {{mkdirs()}} point is significant. Have you found code that expects
atomic directory creation? If so, we'd better fix it.
(this makes me think of something else: a front end client to {{DFSClient}}
that downconverts some of the ops to non-atomic. In the case of mkdirs, simply
doing the mkdir chain client-side would suffice. I don't see an easy way to do
the equivalent of {{mv}} without creating the dest dir then moving the entries
below the original.)
> Define Semantics of FileSystem and FileContext more rigorously
> --------------------------------------------------------------
>
> Key: HADOOP-9371
> URL: https://issues.apache.org/jira/browse/HADOOP-9371
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Affects Versions: 1.2.0, 3.0.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-9361.2.patch, HADOOP-9361.patch,
> HadoopFilesystemContract.pdf
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> The semantics of {{FileSystem}} and {{FileContext}} are not completely
> defined in terms of
> # core expectations of a filesystem
> # consistency requirements.
> # concurrency requirements.
> # minimum scale limits
> Furthermore, methods are not defined strictly enough in terms of their
> outcomes and failure modes.
> The requirements and method semantics should be defined more strictly.
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