Sam Meder created KAFKA-938:
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Summary: High CPU usage when more or less idle
Key: KAFKA-938
URL: https://issues.apache.org/jira/browse/KAFKA-938
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 0.8
Reporter: Sam Meder
Priority: Critical
Fix For: 0.8
We've noticed Kafka using a lot of CPU in a pretty much idle environment and
tracked it down to it's DelayedItem implementation. In particular, the time
conversion for how much longer to wait:
def getDelay(unit: TimeUnit): Long = {
val elapsedMs = (SystemTime.milliseconds - createdMs)
unit.convert(max(delayMs - elapsedMs, 0), unit)
}
does not actually convert, so Kafka ends up treating a ms value like
nanoseconds, e.g. waking up every 100 ns or so. The above code should really be:
def getDelay(unit: TimeUnit): Long = {
val elapsedMs = (SystemTime.milliseconds - createdMs)
unit.convert(max(delayMs - elapsedMs, 0), TimeUnit.MILLISECONDS)
}
I'll attach a patch.
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