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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1488) Allow index sampling ratio to be configured in storage-conf
Date Thu, 09 Sep 2010 20:28:33 GMT
Allow index sampling ratio to be configured in storage-conf
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                 Key: CASSANDRA-1488
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1488
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
            Reporter: Jonathan Ellis
            Priority: Minor
             Fix For: 0.6.6


Cassandra keeps a sample of row keys in memory to look up the right block of index entries,
to look up row data with.  This is kept in the SSTableReader.indexSummary field.  (See Google's
BigTable paper for a high-level description of how this index works; cassandra's is slightly
different in the details but the idea is the same.)

We'd like to make IndexSummary.INDEX_INTERVAL configurable in storage-conf.xml, i.e., in the
DatabaseDescriptor class.  For 0.6, a global setting is fine.

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