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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/NewFileFormat" by stack
Date Thu, 16 Oct 2008 22:58:56 GMT
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The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/NewFileFormat

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  === Nice-to-haves ===
   * Don't write out the family portion of column when writing keys.
  
+ === Excercise ===
+ 
+ Make the index interval one, copy it to local filesystem and memory-map it. Opening, flushing
or compacting, we'd make a copy of the index file on the local file system.  Closing regions,
we'd cleanup local copies of index.  Thanks to Eitan and Nitay for suggested exercise.
+ 
  == Other File Formats ==
  
  Cassandra uses a Sequence File.  It adds key/values in blocks of 128 by default.  On the
128th entry, an index for the block keys is inlined and then a new block begins.  Block offsets
are kept out in an index file as in !MapFile.  Bloomfilters are on by default.

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