Lucandra data structure

2010-07-24  来源:本站原创  分类:Database  人气:162 

Lucandra in storage-conf file set to:

<Keyspace Name="Lucandra">
    <ColumnFamily Name="TermInfo"
        CompareWith="BytesType"
        ColumnType="Super"
        CompareSubcolumnsWith="BytesType"
        KeysCached="10%" />
    <ColumnFamily Name="Documents"
        CompareWith="BytesType"
        KeysCached="10%" />
</Keyspace>

Documents can see TermInfo and two ColumnFamily.

Which TermInfo stored Lucandra reverse index. A SuperColumnFamily.

RowKey:index_name/field/term
SuperColumn.name:documentId
Column.name:"position"
Column.value:position vector

Documents stored in the Document Data. A ColumnFamily.

RowKey:index_name/documentId
Column.name:field name
Column.value:value
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