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From "Dapeng Sun (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SENTRY-1007) Sentry column-level performance for wide tables
Date Fri, 15 Jan 2016 09:04:39 GMT

     [ https://issues.apache.org/jira/browse/SENTRY-1007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dapeng Sun updated SENTRY-1007:
-------------------------------
    Attachment: SENTRY-1007.001.patch

> Sentry column-level performance for wide tables
> -----------------------------------------------
>
>                 Key: SENTRY-1007
>                 URL: https://issues.apache.org/jira/browse/SENTRY-1007
>             Project: Sentry
>          Issue Type: Bug
>    Affects Versions: 1.5.1
>            Reporter: Anne Yu
>            Priority: Critical
>         Attachments: SENTRY-1007.001.patch
>
>
> It appears a query is taking a long time on a wide table due many Sentry column-level
auth checks. 
> here are some investigation results:
> 1) create a table with 4000 columns, grant select on [table|db] to test user, however
{noformat}select * from table{noformat} still validates column level privilege on each column.
So this select command issues 4000 queries to validate column level permissions. It takes
40 seconds on my test cluster (2x large) to return results, for a moment, query seems to freeze:
> {noformat}
> ...
> 2016-01-11 11:54:14,816 INFO DataNucleus.Query: Reading in results for query "SELECT
FROM org.apache.sentry.provider.db.service.model.MSentryPrivilege WHERE roles.contains(role)
&& (role.roleName == "test_role") && serverName == "server1" && ((dbName
== "test_db") || (dbName == "__NULL__")) && (URI == "__NULL__") && ((tableName
== "test_tb") || (tableName == "__NULL__")) && (URI == "__NULL__") && ((columnName
== "test997") || (columnName == "__NULL__")) && (URI == "__NULL__") VARIABLES org.apache.sentry.provider.db.service.model.MSentryRole
role" since the connection used is closing
> 2016-01-11 11:54:14,822 INFO DataNucleus.Query: Reading in results for query "SELECT
FROM org.apache.sentry.provider.db.service.model.MSentryPrivilege WHERE roles.contains(role)
&& (role.roleName == "test_role") && serverName == "server1" && ((dbName
== "test_db") || (dbName == "__NULL__")) && (URI == "__NULL__") && ((tableName
== "test_tb") || (tableName == "__NULL__")) && (URI == "__NULL__") && ((columnName
== "test998") || (columnName == "__NULL__")) && (URI == "__NULL__") VARIABLES org.apache.sentry.provider.db.service.model.MSentryRole
role" since the connection used is closing
> 2016-01-11 11:54:14,828 INFO DataNucleus.Query: Reading in results for query "SELECT
FROM org.apache.sentry.provider.db.service.model.MSentryPrivilege WHERE roles.contains(role)
&& (role.roleName == "test_role") && serverName == "server1" && ((dbName
== "test_db") || (dbName == "__NULL__")) && (URI == "__NULL__") && ((tableName
== "test_tb") || (tableName == "__NULL__")) && (URI == "__NULL__") && ((columnName
== "test999") || (columnName == "__NULL__")) && (URI == "__NULL__") VARIABLES org.apache.sentry.provider.db.service.model.MSentryRole
role" since the connection used is closing
> {noformat}
> Here is the debug log from sentry service:
> {noformat}
> org.apache.sentry.binding.hive.authz.HiveAuthzBinding.authorize(HiveAuthzBinding.java:304)]
requiredInputPrivileges = {Table=[SELECT], Column=[SELECT], URI=[ALL]}
> {noformat}
> 2) the same issue for {noformat}show columns in table{noformat}
> 3) for {noformat}show count(*) in table{noformat}, it requires table level privilege,
so this issue doesn't exist. 
> 4) I found out there are more commands have the same issues are:
> {code}
> SHOW COLUMNS FROM test_tb1;
> create table test_tb2 as select * from test_tb1
> show partitions in test_tb1
> select * from test_tb1
> {code}
> Even for {code}select col1,col2,col3 from test_tb1{code} will issue 3 queries for each
column, instead of one query for all columns in one table;



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