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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2011/09/17 00:01:10 UTC
[jira] [Commented] (HBASE-4424) Provide a means for coprocessors to
create tables for internal use
[ https://issues.apache.org/jira/browse/HBASE-4424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13106846#comment-13106846 ]
Ted Yu commented on HBASE-4424:
-------------------------------
There is already checkTableModifiable() in MasterServices.
Adding one more table related method shouldn't hurt.
> Provide a means for coprocessors to create tables for internal use
> ------------------------------------------------------------------
>
> Key: HBASE-4424
> URL: https://issues.apache.org/jira/browse/HBASE-4424
> Project: HBase
> Issue Type: Improvement
> Components: coprocessors
> Reporter: Gary Helmling
>
> When developing access controls as a coprocessor, we needed to create an internal "_acl_" table for persisting the permission grants. We could have done this in the coprocessor through HBaseAdmin, but it seems silly to go through an RPC loop when we're already implementing a MasterObserver running on HMaster.
> So the simplest approach was to expose createTable() in MasterServices:
> {code}
> /**
> * Create a table using the given table definition.
> * @param desc The table definition
> * @param splitKeys Starting row keys for the initial table regions. If null
> * a single region is created.
> * @param sync If true, waits for all initial regions to be assigned before
> * returning
> */
> public void createTable(HTableDescriptor desc, byte [][] splitKeys)
> throws IOException;
> {code}
> Other coprocessor implementations will likely have similar needs, so I propose we add this to MasterServices.
> The alternative would be to expose some sort of HBaseAdmin like interface via MasterCoprocessorEnvironment, similar to what we do for HTable, but this would be a fair bit more work, and I still think we'll need a way to provide this capability in the short term.
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