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From "Steinmaurer, Thomas" <thomas.steinmau...@dynatrace.com>
Subject RE: JMX metric for dropped hints?
Date Tue, 22 Jan 2019 12:03:44 GMT
Hi,

thanks. I have seen that, but I’m not sure if this maps 1:1 to dropped hints in the Cassandra
log.

Dropped “message” could also mean that something went wrong during a hint replay for a
recovering node, but not necessarily dropped hints due to a node being offline longer than
the default 3hr hinted handoff window.

Am I wrong?

Thanks again,
Thomas

From: Hayato Shimizu <hayato@digitalis.io>
Sent: Dienstag, 22. Jänner 2019 10:16
To: user@cassandra.apache.org
Subject: Re: JMX metric for dropped hints?

Hi Thomas,

The dropped hints count and various rates are available in the following location:


org.apache.cassandra.metrics:type=DroppedMessage,scope=HINT,name=Dropped,*


org.apache.cassandra.metrics/DroppedMessage/HINT/Attributes/Count
org.apache.cassandra.metrics/DroppedMessage/HINT/Attributes/MeanRate
org.apache.cassandra.metrics/DroppedMessage/HINT/Attributes/OneMinuteRate
org.apache.cassandra.metrics/DroppedMessage/HINT/Attributes/FiveMinuteRate
org.apache.cassandra.metrics/DroppedMessage/HINT/Attributes/FifteenMinuteRate


Hayato


On Tue, 22 Jan 2019 at 07:45, Steinmaurer, Thomas <thomas.steinmaurer@dynatrace.com<mailto:thomas.steinmaurer@dynatrace.com>>
wrote:
Hello,

is there a JMX metric for monitoring dropped hints as a counter/rate, equivalent to what we
see in Cassandra log, e.g.:

WARN  [HintedHandoffManager:1] 2018-11-13 13:28:46,991 HintedHandoffMetrics.java:79 - /XXX
has 18180 dropped hints, because node is down past configured hint window.
WARN  [HintedHandoffManager:1] 2018-11-13 13:27:29,305 HintedHandoffMetrics.java:79 - /XXX
has 1191 dropped hints, because node is down past configured hint window.
WARN  [HintedHandoffManager:1] 2018-11-13 13:23:09,393 HintedHandoffMetrics.java:79 - /XXX
has 135531 dropped hints, because node is down past configured hint window.


Thanks,
Thomas

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