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The following page has been changed by stack: http://wiki.apache.org/hadoop/Hbase/NewFileFormat ------------------------------------------------------------------------------ === 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.
