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https://issues.apache.org/jira/browse/HBASE-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cristian Ivascu updated HBASE-2184:
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Status: Patch Available (was: Open)
> Calling HTable.getTableDescriptor().* on a full cluster takes a long time
> -------------------------------------------------------------------------
>
> Key: HBASE-2184
> URL: https://issues.apache.org/jira/browse/HBASE-2184
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.21.0
> Environment: CentOS 5.4, x86_64
> MacOSX 10.6
> Reporter: Cristian Ivascu
> Attachments: HBASE_2184_0.21.0.patch
>
>
> On a cluster with many tables, and consequently many regions, calling the
> getTableDescriptor() methods on a HTable takes a very long time, depending on
> the number of regions. For comparison, on a cluster with 7000 regions,
> getting a table descriptor ranged between 4 and 36 seconds, even when the
> queried table was empty.
> The problem seems to lie in the HConnectionManager.getHTableDescriptor()
> method, which calls MetaScanner.scan() with an empty START_ROW. This means
> that even if we need the descriptor for a single region table, we still need
> to wait until the entire META is scanned. There is also a constructor for
> MetaScanner.scan() which takes the table name to lookup as a param.
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