LevelDB hard links

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LevelDB hard links


I was going through http://activemq.apache.org/leveldb-store.html to understand leveldb.
As mentioned:

> Fast index snapshots using hard links
I didn't understand. Where hard links are used in leveldb. ?

>  LevelDB based indexes which have several nice properties due to the 'append only' files access patterns

How 'append-only' file access pattern is useful in leveldb. and which file access pattern kahadb uses ?