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https://issues.apache.org/jira/browse/DRILL-4990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15668631#comment-15668631
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ASF GitHub Bot commented on DRILL-4990:
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Github user sohami commented on the issue:
https://github.com/apache/drill/pull/652
LGTM
> Use new HDFS API access instead of listStatus to check if users have
> permissions to access workspace.
> -----------------------------------------------------------------------------------------------------
>
> Key: DRILL-4990
> URL: https://issues.apache.org/jira/browse/DRILL-4990
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.8.0
> Reporter: Padma Penumarthy
> Assignee: Sorabh Hamirwasia
> Fix For: 1.9.0
>
>
> For every query, we build the schema tree
> (runSQL->getPlan->getNewDefaultSchema->getRootSchema). All workspaces in all
> storage plugins are checked and are added to the schema tree if they are
> accessible by the user who initiated the query. For file system plugin,
> listStatus API is used to check if the workspace is accessible or not
> (WorkspaceSchemaFactory.accessible) by the user. The idea seem to be if the
> user does not have access to file(s) in the workspace, listStatus will
> generate an exception and we return false. But, listStatus (which lists all
> the entries of a directory) is an expensive operation when there are large
> number of files in the directory. A new API is added in Hadoop 2.6 called
> access (HDFS-6570) which provides the ability to check if the user has
> permissions on a file/directory. Use this new API instead of listStatus.
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