[Lucene-hadoop Wiki] Trivial Update of "Hbase/HbaseArchitecture" by JimKellerman

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The following page has been changed by JimKellerman:
http://wiki.apache.org/lucene-hadoop/Hbase/HbaseArchitecture

The comment on the change is:
update current status

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   1. There's some HRegion-specific testing code that is a Junit test for HRegion. A new version of this test has to be written so it works against an HRegion while it's hosted by an H!RegionServer, and connected to an H!BaseMaster.
   1. Implement some kind of block caching in HRegion. While the DFS isn't hitting the disk to fetch blocks, HRegion is making IPC calls to DFS (via !MapFile)
   1. Investigate possible performance problem or memory management issue related to random reads. As more and more random reads are done, performance slows down and the memory footprint increases.
-  1. Extend scanners to support iterating over all the columns in a family ("family-name:"), and to support regular expressions for column family members.
  
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