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https://issues.apache.org/jira/browse/HBASE-451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Sigoure updated HBASE-451:
---------------------------------
Hadoop Flags: Incompatible change,Reviewed (was: Reviewed)
This change completely breaks RPC level compatibility because of this line
added to {{HbaseObjectWritable}}:
{code}
addToMap(HTableDescriptor[].class, code++);
{code}
> Remove HTableDescriptor from HRegionInfo
> ----------------------------------------
>
> Key: HBASE-451
> URL: https://issues.apache.org/jira/browse/HBASE-451
> Project: HBase
> Issue Type: Improvement
> Components: master, regionserver
> Affects Versions: 0.2.0
> Reporter: Jim Kellerman
> Assignee: Subbu M Iyer
> Priority: Critical
> Fix For: 0.92.0
>
> Attachments: 451-addendum-v2.txt,
> 451_support_for_removing_HTD_from_HRI_trunk.txt,
> HBASE-451-Fixed_broken_TestAdmin.patch,
> HBASE-451-Fixed_broken_TestAdmin1.patch,
> HBASE-451_-_First_draft_support_for_removing_HTD_from_HRI1.patch,
> HBASE-451_-_Fourth_draft_support_for_removing_HTD_from_HRI.patch,
> HBASE-451_-_Second_draft_-_Remove_HTD_from_HRI.patch, descriptors.txt,
> fixtestadmin.txt, pass_htd_on_region_construction.txt
>
>
> There is an HRegionInfo for every region in HBase. Currently HRegionInfo also
> contains the HTableDescriptor (the schema). That means we store the schema n
> times where n is the number of regions in the table.
> Additionally, for every region of the same table that the region server has
> open, there is a copy of the schema. Thus it is stored in memory once for
> each open region.
> If HRegionInfo merely contained the table name the HTableDescriptor could be
> stored in a separate file and easily found.
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