You can get dropped message statistics over JMX. for example nodetool tpstats has a counter for dropped hints from startup. that would be the preferred method for tracking this info, rather than parsing logs
On 2 Nov. 2017 6:24 am, "Anumod Mullachery" <anumodmullache...@gmail.com> wrote: Hi All, In cassandra v 2.1.15 , I'm able to pull the hints drop and dropped messages from cassandra.log as below- dropped hints--> "/opt/xcal/apps/cassandra/logs/cassandra.log <https://splunk.ccp.cable.comcast.com/en-US/app/search/search?q=search%20ring%3A%3A*%20%20%20NOT%20ring%3A%3AXHOMEcls_Prod0%20%20%20NOT%20ring%3A%3AXBO_prod0%20source%3D%22*cassandra.log*%22%20%22dropped%20hints%22%20%20ring%3DCI_ParentalControlCQL%20%7C%20rex%20%22HintedHandoffMetrics%20%5C%2F(%3F%3Cdestination%3E.*)%5Cshas%20(%3F%3Cdropped%3E%5Cd%2B)%22%20%7C%20bucket%20span%3D15m%20_time%20&display.page.search.mode=smart&dispatch.sample_ratio=1&earliest=-4h&latest=now&display.page.search.tab=events&display.general.type=events&sid=1509561773.447850_874E67FA-980C-410D-A52B-FE91D5E0AAAE#> --> HintedHandoffMetrics.java:79 - /184.108.40.206 has 5 dropped hints, because node is down past configured hint window." Dropped messages --> "/opt/xcal/apps/cassandra/logs/cassandra.log <https://splunk.ccp.cable.comcast.com/en-US/app/search/search?q=search%20ring%3A%3A*%20ring!%3D*xbo*%20(sourcetype%3Dcassandra%20OR%20sourcetype%3Ddse)%20%22messages%20dropped%22%20&display.page.search.mode=smart&dispatch.sample_ratio=1&earliest=-4h&latest=now&display.page.search.tab=events&display.general.type=events&sid=1509562391.448085_874E67FA-980C-410D-A52B-FE91D5E0AAAE#> --> NFO MessagingService 1 MUTATION messages dropped in last 5000ms" But in Cassandra *V 3.10* , I'm not able to get the cassandra logs as v 2.1.15. I'm not able to get any info from the cassandra logs for dropped hints & dropped messages. ( I was testing this on Test cluster by stopping the cassandra services on one of the node , where the hints window is set to 05 Mins and kept the node down for 1 hour , and monitoring the cassandra logs, but nothing generated on dropped hints on any other nodes in the cluster ). The only message I found is on the down node is that - "Paused hints dispatch". Can some one put some light on this issue on 3.10 , is there any changes in the hints & dropped messages , logs or the process. thanks in advance, regards, Anumod.