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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