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https://issues.apache.org/jira/browse/CASSANDRA-13289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898858#comment-15898858
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Romain Hardouin edited comment on CASSANDRA-13289 at 3/7/17 9:07 AM:
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bq. Yes you can set it via JMX.
Great, thanks!

Typo in cassandra.yaml: {{requested by each each write}}
Also, I don't see where {{import javax.xml.crypto.Data}} is used in 
StorageProxy.  


was (Author: rha):
> Yes you can set it via JMX.
Great, thanks!

Typo in cassandra.yaml: {{requested by each each write}}

> Make it possible to monitor an ideal consistency level separate from actual 
> consistency level
> ---------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13289
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13289
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 4.0
>
>
> As an operator there are several issues related to multi-datacenter 
> replication and consistency you may want to have more information on from 
> your production database.
> For instance. If your application writes at LOCAL_QUORUM how often are those 
> writes failing to achieve EACH_QUORUM at other data centers. If you failed 
> your application over to one of those data centers roughly how inconsistent 
> might it be given the number of writes that didn't propagate since the last 
> incremental repair?
> You might also want to know roughly what the latency of writes would be if 
> you switched to a different consistency level. For instance you are writing 
> at LOCAL_QUORUM and want to know what would happen if you switched to 
> EACH_QUORUM.
> The proposed change is to allow an ideal_consistency_level to be specified in 
> cassandra.yaml as well as get/set via JMX. If no ideal consistency level is 
> specified no additional tracking is done.
> if an ideal consistency level is specified then the 
> {{AbstractWriteResponesHandler}} will contain a delegate WriteResponseHandler 
> that tracks whether the ideal consistency level is met before a write times 
> out. It also tracks the latency for achieving the ideal CL  of successful 
> writes.
> These two metrics would be reported on a per keyspace basis.



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