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
http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/troubleshooting/trblshootIdleFirewall.html
.
In multi dc setup, documentation recommends to increase number of threads. You
can try increasing it and check whether it improves the situation.
ThanksAnuj
On Tue, Jun 27, 2017 at 9:47 PM, Meg Mara<mm...@digitalriver.com> wrote:
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Hello,
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
