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From "Guanghao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18600) Provide a method to disable the Short-Circuit HTable in coprocessor
Date Wed, 16 Aug 2017 01:44:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16128194#comment-16128194
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Guanghao Zhang commented on HBASE-18600:
----------------------------------------

Copy the comment.
bq. When doing a runAsUser, how/whether we should reset the Rpc context to have the new user.
Do we have other scenario which need reset the Rpc context? If not, I thought we can only
fixed this for this problem. We can introduce a new config or method to disable the "Short-Circuit
Coprocessor HTable access" feature. The code may be:
{code}
        User.runAsLoginUser(new PrivilegedExceptionAction<Void>() {
          @Override
          public Void run() throws Exception {
             // disable the "Short-Circuit Coprocessor HTable access" feature first
             // Then start a new rpc call
            AccessControlLists.addUserPermission(regionEnv.getConfiguration(), perm,
              regionEnv.getTable(AccessControlLists.ACL_TABLE_NAME), request.getMergeExistingPermissions());
            return null;
          }
        });
{code}

> Provide a method to disable the Short-Circuit HTable in coprocessor
> -------------------------------------------------------------------
>
>                 Key: HBASE-18600
>                 URL: https://issues.apache.org/jira/browse/HBASE-18600
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>         Attachments: HBASE-18600.master.001.patch
>
>
> HBASE-9534: Allow coprocessors accessing an HTable to short-circuit access to the local
HRegionServer, rather than requiring the usual RPC path. And it only worked for RegionCoprocessorEnvironment.
This issue add a new method for RegionCoprocessorEnvironment.  getShortCircuitTable method
is used to get a  short-circuit access HTable. And getTable method is used to get a normal
table.



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