how long to wait after creating a secondary index in cassandra ?
It will take as long as it needs to take to index existing data.
It is almost impossible to predict how long it will take since there are a lot of moving parts involved. Some of the contributing factors are:
You can make an estimate based on the progress of the indexing so far (from the
nodetool compactionstats output) but that estimate will only be accurate for that point in time. Cheers!
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