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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10580) Add latency metrics for dropped messages
Date Fri, 18 Dec 2015 00:41:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063187#comment-15063187
] 

Paulo Motta commented on CASSANDRA-10580:
-----------------------------------------

2.2 patch looks good. if this goes on 2.2 it will probably need to go on 3.0.x, so you'll
also need to provide patches for the cassandra-3.0 branch (unfortunately none of the previous
patches merge on 3.0).

Below are test results for 2.2 and trunk:

||2.2||trunk||
|[branch|https://github.com/apache/cassandra/compare/cassandra-2.2...pauloricardomg:2.2-10580]|[branch|https://github.com/apache/cassandra/compare/trunk...pauloricardomg:trunk-10580]|
|[testall|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-2.2-10580-testall/lastCompletedBuild/testReport/]|[testall|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-trunk-10580-testall/lastCompletedBuild/testReport/]|
|[dtest|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-2.2-10580-dtest/lastCompletedBuild/testReport/]|[dtest|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-trunk-10580-dtest/lastCompletedBuild/testReport/]|


> Add latency metrics for dropped messages
> ----------------------------------------
>
>                 Key: CASSANDRA-10580
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10580
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Coordination, Observability
>         Environment: Production
>            Reporter: Anubhav Kale
>            Assignee: Anubhav Kale
>            Priority: Minor
>             Fix For: 3.2, 2.2.x
>
>         Attachments: 0001-Metrics.patch, 10580-Metrics.patch, 10580.patch, 2.2-All-Comments.patch,
CASSANDRA-10580-Head.patch, Trunk-All-Comments.patch, Trunk.patch
>
>
> In our production cluster, we are seeing a large number of dropped mutations. At a minimum,
we should print the time the thread took to get scheduled thereby dropping the mutation (We
should also print the Message / Mutation so it helps in figuring out which column family was
affected). This will help find the right tuning parameter for write_timeout_in_ms. 
> The change is small and is in StorageProxy.java and MessagingTask.java. I will submit
a patch shortly.



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