[jira] [Created] (IMPALA-10272) LOAD DATA should respect Ranger-HDFS policies

["Quanlong Huang (Jira)" <ji...@apache.org>]

Quanlong Huang created IMPALA-10272:
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             Summary: LOAD DATA should respect Ranger-HDFS policies
                 Key: IMPALA-10272
                 URL: https://issues.apache.org/jira/browse/IMPALA-10272
             Project: IMPALA
          Issue Type: Bug
            Reporter: Quanlong Huang


[~thundergun] reported an issue that analyzing a LOAD DATA statement fails in checking  access to the source file while a Ranger HDFS policy actually exists to allow the access. Impala only loads the permissions from HDFS and check accesses by itself. Related codes: https://github.com/apache/impala/blob/ee4043e1a0940ae5711c68336d1ad522631d0e35/fe/src/main/java/org/apache/impala/analysis/LoadDataStmt.java#L195-L206

When Ranger authorization is enabled, this could be wrong if the HDFS permissions is more restrict than the Ranger policies. According to the Ranger document: [https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=57901344#RangerUserGuide(workinprogress)-HDFSPolicycreation]
{quote}when the NameNode receives a user request, the Ranger Plugin checks for policies set through the Ranger Policy Manager. Then, if there are no policies authorizing the request, the Ranger plugin checks for permissions set in HDFS.
{quote}

We currently don't have an embeded ranger-hdfs plugin to check this locally. I think we can check the access using {{FileSystem#access(Path path, FsAction mode)}} to invoke a NameNode RPC as a quick fix for this.



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