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