Max Documents in a Segment


(Djtecha) #1

I'm curious if anyone knows lucene enough to explain what the max number of documents or data size should exist in a segment. As in at what point does forcemerging an index have diminishing returns? If I have a 50GB index with 300M documents, is it better to have 1 5 or 10 Segments?


(Mark Walkom) #2

The max doc limit works on a shard level, not a segment, and it's 2^32-1.


(Christian Dahlqvist) #3

This depends on what you are trying to achieve by the force merge. If you are looking to speed up queries I suspect you need to benchmark to see what the ideal segment size is. If you on the other hand are looking to reduce heap usage, force merging down to a single shard is always beneficial, as described in this webinar.


(system) #4

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