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https://issues.apache.org/jira/browse/HDFS-5614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886992#comment-13886992
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Chris Nauroth commented on HDFS-5614:
-------------------------------------
I've just noticed that my v1 patch here has introduced a bug. If I 1) apply an
ACL to a file, 2) remove that ACL, 3) save a new checkpoint, and 4) restart NN,
I find that I can no longer add a new ACL to that file. Somehow, the file has
been left in a state where the ACL bit is off, but it has an {{AclFeature}}.
Then, when I try to add an ACL again, it trips the {{IllegalStateException}}
for trying to add multiple instances of {{AclFeature}} in
{{INodeWithAdditionalFields#addAclFeature}}.
I'm going to track down this bug. I suspect this patch will remain mostly the
same, but I wanted to give potential code reviewers a heads-up that there will
be a v2 patch coming.
> NameNode: implement handling of ACLs in combination with snapshots.
> -------------------------------------------------------------------
>
> Key: HDFS-5614
> URL: https://issues.apache.org/jira/browse/HDFS-5614
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS ACLs (HDFS-4685)
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: HDFS-5614.1.patch
>
>
> Within a snapshot, all ACLs are frozen at the moment that the snapshot was
> created. ACL changes in the parent of the snapshot are not applied to the
> snapshot.
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