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From Anuj Wadehra <>
Subject Re: Hints files are not getting truncated
Date Tue, 27 Jun 2017 16:56:07 GMT
Hi Meg,
max_hint_window_in_ms =3 hrs means that if a node is down/unresponsive for more than 3 hrs,
hints would not be stored for it any further until it becomes responsive again. It should
not mean that already stored hints would be truncated after 3 hours.
Regarding connection timeouts between DCs, please check your firewall settings and tcp settings
on node. Firewall between the DC must not kill an idle connection which is still considered
to be usable by Cassandra. Please see
In multi dc setup, documentation recommends to increase number of threads. You can try increasing
it and check whether it improves the situation.

  On Tue, Jun 27, 2017 at 9:47 PM, Meg Mara<> wrote:    <!--#yiv5811390882
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I am facing an issue with Hinted Handoff files in Cassandra v3.0.10. A DC1 node is storing
large number of hints for DC2 nodes (we are facing connection timeout issues). The problem
is that the hint files which are created on DC1 are not getting deleted after the 3 hour window.
Hints are now being stored as flat files in the Cassandra home directory and I can see that
old hints are being deleted but at a very slow pace. It still contains hints from May.
max_hint_window_in_ms: 10800000
max_hints_delivery_threads: 2
Why do you suppose this is happening? Any suggestions or recommendations would be much appreciated.
Thanks for your time.
Meg Mara

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