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From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Trivial Update of "Hbase/HbaseArchitecture" by stack
Date Tue, 17 Apr 2007 15:30:17 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.

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

The comment on the change is:
Sync doc w/ code: Add 'family name' delimiter to all column names, etc.

------------------------------------------------------------------------------
  may not have a value for a particular row key (sparse). The following example is a slightly
modified form of the one on page 2 of the [http://labs.google.com/papers/bigtable.html Bigtable
Paper].
  
  [[Anchor(datamodelexample)]]
- ||<:> '''Row Key''' ||<:> '''Time Stamp''' ||<:> '''Column''' ''"contents:"''
||||<:> '''Column''' ''"anchor:"'' ||<:> '''Column''' ''"mime"'' ||
+ ||<:> '''Row Key''' ||<:> '''Time Stamp''' ||<:> '''Column''' ''"contents:"''
||||<:> '''Column''' ''"anchor:"'' ||<:> '''Column''' ''"mime:"'' ||
  ||<^|5> "com.cnn.www" ||<:> t9 || ||<)> "anchor:cnnsi.com" ||<:>
"CNN" || ||
  ||<:> t8 || ||<)> "anchor:my.look.ca" ||<:> "CNN.com" || ||
  ||<:> t6 ||<:> "<html>..." || || ||<:> "text/html" ||
@@ -105, +105 @@

  
  It is important to note in the diagram above that the empty cells
  shown in the conceptual view are not stored. Thus a request for the
- value of the ''"contents"'' column at time stamp ''t8'' would return
+ value of the ''"contents:"'' column at time stamp ''t8'' would return
- a null value. Similarly, a request for an ''"anchor"'' value at time
+ a null value. Similarly, a request for an ''"anchor:"'' value at time
  stamp ''t9'' for "my.look.ca" would return a null value.
  
  However, if no timestamp is supplied, the most recent value for a
  particular column would be returned and would also be the first one
  found since time stamps are stored in descending order. Consequently
- the value returned for ''"contents"'' if no time stamp is supplied is
+ the value returned for ''"contents:"'' if no time stamp is supplied is
- the value for ''t6'' and the value for an ''"anchor"''  for
+ the value for ''t6'' and the value for an ''"anchor:"''  for
  "my.look.ca" if no time stamp is supplied is the value for time stamp
  ''t8''.
  
  === Example ===
  
- To show how data is stored on disk, consider the folloing example:
+ To show how data is stored on disk, consider the following example:
  
  A program writes rows "row[0-9]", column "anchor:foo"; then writes
  rows "row[0-9]"; column "anchor:bar"; and finally writes rows
@@ -299, +299 @@

  
  tablename + endkey + regionId.
  
- You can see this identifier being constructed in
+ (You can see this identifier being constructed in the
- HRegion.buildRegionName().
+ HRegionInfo constructor.)
  
  [[Anchor(metadata)]]
  = META Table =

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