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https://issues.apache.org/jira/browse/HADOOP-18012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17701537#comment-17701537
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ASF GitHub Bot commented on HADOOP-18012:
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sreeb-msft opened a new pull request, #5488:
URL: https://github.com/apache/hadoop/pull/5488
RenameFilePath on its first try receives a Request timed out error with code
500. On retrying the same operation, a Source file not found (404) error is
received.
Possible temporary mitigation: Check whether etags remain the same before
and after the retry and accordingly send an Operation Successful result,
instead of source file not found. For this, adding a check and an additional
call to get the source eTag, in case it is not present already, to check after
a rename retry whether the source and destination eTags match.
> 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: 3.3.2
> Reporter: Sneha Vijayarajan
> Assignee: Sree Bhattacharyya
> 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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