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https://issues.apache.org/jira/browse/HADOOP-17643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HADOOP-17643:
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Component/s: fs/azure
Hadoop Flags: Reviewed
Target Version/s: 3.3.2, 3.2.3, 3.4.0
> WASB : Make metadata checks case insensitive
> --------------------------------------------
>
> Key: HADOOP-17643
> URL: https://issues.apache.org/jira/browse/HADOOP-17643
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/azure
> Affects Versions: 2.7.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.2.3, 3.3.2
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> WASB driver uses meta data on blobs to denote permission, whether its a place
> holder 0 sized blob for dir etc.
> For storage migration users uses Azcopy, it copies the blobs but will cause
> the metadata keys to get changed to camel case. As per discussion with MSFT
> Azcopy team, this is a known issue and technical limitation. This is what
> Azcopy team explained
> "For context, blob metadata is implemented with HTTP headers. They are case
> insensitive but case preserving.
> There is a known issue with the Go language. The HTTP client that it provides
> does this case modification to the response headers before we can read the
> raw values, so the destination metadata keys have a different casing than the
> source. We’ve reached out to the Go Team in the past but weren’t successful
> in convincing them to change the behaviour. We don’t have a short term
> solution right now"
> So propose to change the metadata key checks to do case insensitive checks.
> May be make case insensitive check configurable with defaults to false for
> compatibility.
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