Speed up incremental collection replication using revisions #15770
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* Parallelize applying of revision tree changes with fetching next revision tree range in incremental collection replication for collections created with ArangoDB 3.8 and higher.
jsteemann
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Scope & Purpose
Parallelize the application of revision tree changes with fetching the next revision tree range batch in the incremental collection replication for collections created with ArangoDB 3.8 and higher.
In some unscientific benchmark, this improved incremental in-sync duration from 20 seconds to 11 seconds for a collection with 20m documents and every 1000th document changed on the leader. Results may vary depending on the collection and document sizes and the number of differences between leader and follower.
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