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https://issues.apache.org/jira/browse/HADOOP-17921?focusedWorklogId=659138&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-659138
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ASF GitHub Bot logged work on HADOOP-17921:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 01/Oct/21 20:31
Start Date: 01/Oct/21 20:31
Worklog Time Spent: 10m
Work Description: cnauroth commented on pull request #3463:
URL: https://github.com/apache/hadoop/pull/3463#issuecomment-932531983
My only other thought is that this sort of logic is the kind of thing that
should eventually make its way over to using `PathCapabilities`. For complete
accuracy though, the HDFS client implementation would need its
`hasPathCapability` implementation to have knowledge of whether or not the
remote NameNode has xattrs enabled. Considering federation, you might even
have different namespaces enabled or disabled, so the final answer is dependent
on the path presented by the caller. We could avoid that complexity if we
removed the configuration property for disabling xattrs. (It's a stable
feature at this point.) That would be a backward-incompatible change though.
I've tried more brainstorming on this, and unfortunately, I can't think of a
solution with high confidence in guaranteeing backward compatibility.
We've focused discussion on xattrs so far, but there is similar logic for
ACLs too that is susceptible to the same problems.
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Issue Time Tracking
-------------------
Worklog Id: (was: 659138)
Time Spent: 1h 50m (was: 1h 40m)
> DistCp derives if XAttr is supported wrongly
> --------------------------------------------
>
> Key: HADOOP-17921
> URL: https://issues.apache.org/jira/browse/HADOOP-17921
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Pravin Sinha
> Assignee: Pravin Sinha
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> {color:#0033b3}public static void
> {color}{color:#00627a}checkFileSystemXAttrSupport{color}({color:#000000}FileSystem
> {color}fs)
> {color:#0033b3}throws {color}{color:#000000}XAttrsNotSupportedException
> {color}{
> {color:#0033b3}try {color}{
> fs.getXAttrs({color:#0033b3}new
> {color}Path({color:#000000}Path{color}.{color:#871094}SEPARATOR{color}));
> } {color:#0033b3}catch {color}({color:#000000}Exception {color}e) {
> {color:#0033b3}throw new
> {color}XAttrsNotSupportedException({color:#067d17}"XAttrs not supported for
> file system: "
> {color} + fs.getUri());
> }
> }
> IOExecption will also be treated as if Xattr is not supported, which would be
> wrong.
>
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