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https://issues.apache.org/jira/browse/HDFS-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452287#comment-13452287
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Aaron T. Myers commented on HDFS-3907:
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bq. could we also get a test that tests the single-user case?
Couldn't hurt, but doing so would really only be testing the
comma-separated-list configuration parsing code, since the two-user case is
pretty much just testing the single-user case twice.
bq. we should continue to test with a not allowed user and add a new test to
test with the other allowed user.
The current patch does this, it's just a little misleading since Eli changed
the comment above the disallowed user case which made it look like he removed
it. In fact that case is still tested down below.
> Allow multiple users for local block readers
> --------------------------------------------
>
> Key: HDFS-3907
> URL: https://issues.apache.org/jira/browse/HDFS-3907
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hdfs-3907.txt
>
>
> The {{dfs.block.local-path-access.user}} config added in HDFS-2246 only
> supports a single user, however as long as blocks are group readable by more
> than one user the feature could be used by multiple users, to support this we
> just need to allow both to be configured. In practice this allows us to also
> support HBase where the client (RS) runs as the hbase system user and the DN
> runs as hdfs system user. I think this should work secure as well since we're
> not using impersonation in the HBase case.
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