[jira] Commented: (HBASE-2857) HBaseAdmin.tableExists() should not require a full meta scan

["Jonathan Gray (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890496#action_12890496 ] 

Jonathan Gray commented on HBASE-2857:
--------------------------------------

Also, I thought listTables() was implemented as it was so that it wouldn't require the master.

However, the code actually does a check for a master at the beginning, unnecessarily.  Should also take that out or change the implementation of listTables().

> HBaseAdmin.tableExists() should not require a full meta scan
> ------------------------------------------------------------
>
>                 Key: HBASE-2857
>                 URL: https://issues.apache.org/jira/browse/HBASE-2857
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jonathan Gray
>             Fix For: 0.90.0
>
>
> HBaseAdmin.tableExists() actually makes a call to HBaseAdmin.listTables() and then checks if the table you are looking for is in the list.
> listTables() uses a MetaScanner/MetaVisitor, thus requiring an entire META table scan.
> We should not require a full META scan to check for the existence of a single table.

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