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When are hints dropped in Cassandra

There are 2 articles I read about Hinted Handoffs in Cassandra.

In Article1 it states that the hints are discarded after max_hint_window_in_ms (3 hours by default), but according to Article2 the hints are discarded after gc_grace_seconds (default: 10 days). If we assume the defaults then when will the hints be discarded?

As mentioned in 2nd article, behavior is different depending on Cassandra version. The first link describes Cassandra 2.1, while 2nd article talks about 3.x versions.

What version of Cassandra do you use?

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