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From A J <>
Subject Node repair questions
Date Mon, 11 Jul 2011 19:42:48 GMT
Have the following questions related to nodetool repair:
1. I know that Nodetool Repair Interval has to be less than
GCGraceSeconds. How do I come up with an exact value of GCGraceSeconds
and 'Nodetool Repair Interval'. What factors would want me to change
the default of 10 days of GCGraceSeconds. Similarly what factors would
want me to keep Nodetool Repair Interval to be just slightly less than
GCGraceSeconds (say a day less).

2. Does a Nodetool Repair block any reads and writes on the node,
while the repair is going on ? During repair, if I try to do an
insert, will the insert wait for repair to complete first ?

3. I read that repair can impact your workload as it causes additional
disk and cpu activity. But any details of the impact mechanism and any
ballpark on how much the read/write performance deteriorates ?


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