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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "HBase/RoadMaps" by stack
Date Mon, 20 Oct 2008 17:57:24 GMT
Dear Wiki user,

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The following page has been changed by stack:

The comment on the change is:
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   Currently HBase is hardcoded to use the Hadoop !MapFile as its base file system type (i.e.
the SSTable from the Bigtable paper). Experience has shown the Hadoop !MapFile type as suboptimal
given HBase access patterns. For example, the !MapFile index is ignorant of HBase 'rows'.
We would change HBase to instead run against a file interface [https://issues.apache.org/jira/browse/HBASE-61
(HBASE-61 Create an HBase-specific MapFile implementation)]. A configuration option would
dictate which file format implementation an HBase instance would use, just as you can swap
'engines' in MySQL.
   Once the abstraction work had finished, we would add a new file format to go against this
interface to replace Hadoop !MapFile. The new file format would be more amenable to HBase
I/O patterns. It will either be the TFile specified in the attachment to [https://issues.apache.org/jira/browse/HADOOP-3315
HADOOP-3315 New binary format] or something similar.
+ Here are some notes on [http://wiki.apache.org/hadoop/Hbase/NewFileFormat new file format]
   * Redo HBase RPC

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