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https://issues.apache.org/jira/browse/HADOOP-18012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470636#comment-17470636
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Steve Loughran commented on HADOOP-18012:
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those failing tests are gone now, right?
in MAPREDUCE-7341 I am placing the etag recovery code into the hadoop-azure
module, with a private renameFile(src, dest, etag) call which passes in the etag
the normal rename can add a head for the etag or fail if overloaded (thoughts?)
so that it can recover from failure; the new API will have that etag from the
manifest so not need the extra call.
> ABFS: Enable config controlled ETag check for Rename idempotency
> ----------------------------------------------------------------
>
> Key: HADOOP-18012
> URL: https://issues.apache.org/jira/browse/HADOOP-18012
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.1
> Reporter: Sneha Vijayarajan
> Assignee: Sneha Vijayarajan
> Priority: Major
>
> ABFS driver has a handling for rename idempotency which relies on LMT of the
> destination file to conclude if the rename was successful or not when source
> file is absent and if the rename request had entered retry loop.
> This handling is incorrect as LMT of the destination does not change on
> rename.
> This Jira will track the change to undo the current implementation and add a
> new one where for an incoming rename operation, source file eTag is fetched
> first and then rename is done only if eTag matches for the source file.
> As this is going to be a costly operation given an extra HEAD request is
> added to each rename, this implementation will be guarded over a config and
> can enabled by customers who have workloads that do multiple renames.
> Long term plan to handle rename idempotency without HEAD request is being
> discussed.
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