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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2478) [hbase] restructure how HBase lays out files in the file system
Date Thu, 20 Dec 2007 22:07:43 GMT
[hbase] restructure how HBase lays out files in the file system
---------------------------------------------------------------

                 Key: HADOOP-2478
                 URL: https://issues.apache.org/jira/browse/HADOOP-2478
             Project: Hadoop
          Issue Type: Improvement
          Components: contrib/hbase
    Affects Versions: 0.16.0
            Reporter: Jim Kellerman
            Assignee: Jim Kellerman
             Fix For: 0.16.0


Currently HBase has a pretty flat directory structure. For example:

{code}
 /hbase/hregion_70236052/info
/hbase/hregion_70236052/info/info/4328260619704027575
/hbase/hregion_70236052/info/mapfiles/4328260619704027575
/hbase/hregion_70236052/info/mapfiles/4328260619704027575/data
/hbase/hregion_70236052/info/mapfiles/4328260619704027575/index
{code}

All the region directories are under the root directory, and with encoded region names, it
is impossible to determine what table a region belongs to. This should be restructured to:

{code}
/root-directory/table-name/encoded-region-name/column-family/{info,mapfiles}
{code}

It will be necessary to provide a migration script from current trunk to the new structure.

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