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Peter Schuller |
at Mar 11, 2012 at 10:03 pm
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I am using TTL 3 hours and GC grace 0 for a CF. I have a normal CF that has
records with TTL 3 hours and I dont send any delete request. I just wonder
if using GC grace 0 will cause any problem except extra Memory/IO/network
load. I know that gc grace is for not transferring deleted records after a
down node comes back. So I assumed that transferring expired records will
not cause any problem.
Do you have any idea? Thank you!
If you do not perform any deletes at all, a GC grace of 0 should be
fine. But if you don't, the GC grace should not really be relevant
either. So I suggest leaving GC grace high in case you do start doing
deletes.
Columns with TTL:s will disappear regardless of GC grace.
If you do decide to run with short GC grace, be aware of the
consequencues:
http://wiki.apache.org/cassandra/Operations#Dealing_with_the_consequences_of_nodetool_repair_not_running_within_GCGraceSeconds
