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Type:
Bug
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Resolution: Done
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Priority:
Critical - P2
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Affects Version/s: 3.0.0-rc6
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Component/s: Diagnostics
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Labels:None
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Fully Compatible
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ALL
first start a replset running wiredtiger
var x = new ReplSetTest({nodes:3})
x.startSet({storageEngine:"wiredTiger"})
x.initiate()
then put some load on the primary
while (1) { x.getPrimary().getDB('test').test.insert({}); }
compare the output of the top command on the primary and the secondary. the total time on the namespace being written to increases on the primary, but never changes on the secondary.
testReplSet:PRIMARY> before=db.runCommand("top").totals["test.test"].total.time; sleep(1000); after=db.runCommand("top").totals["test.test"].total.time;print(after-before)
170816
...
testReplSet:SECONDARY> before=db.runCommand("top").totals["test.test"].total.time; sleep(1000); after=db.runCommand("top").totals["test.test"].total.time;print(after-before)
0
it does behave correctly if you use mmapv1 instead though:
testReplSet:PRIMARY> before=db.runCommand("top").totals["test.test"].total.time; sleep(1000); after=db.runCommand("top").totals["test.test"].total.time;print(after-before)
135118
...
testReplSet:SECONDARY> before=db.runCommand("top").totals["test.test"].total.time; sleep(1000); after=db.runCommand("top").totals["test.test"].total.time;print(after-before)
75982