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https://issues.apache.org/jira/browse/CASSANDRA-4537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450985#comment-13450985
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Jonathan Ellis commented on CASSANDRA-4537:
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Idea: show number of sstables / desired max, when we exceed the desired 
threshold?  This would give you a quick eyeball of "here's where compaction is 
behind."

SSTables in each level: [43/0, 8, 102/100, 123, 0, 0, 0, 0]

                
> We should emit number of sstables in each level from JMX
> --------------------------------------------------------
>
>                 Key: CASSANDRA-4537
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4537
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: sankalp kohli
>            Assignee: Yuki Morishita
>            Priority: Minor
>              Labels: compaction, leveled
>             Fix For: 1.2.1
>
>         Attachments: 4537.txt
>
>   Original Estimate: 12h
>  Remaining Estimate: 12h
>
> We should add methods to this Mbean 
> org.apache.cassandra.db.ColumnFamilyStoreMBean
> These metrics will be helpful to see how sstables are distributed in 
> different levels and how they move to higher level with time. 
> Currently we can see this by looking at the json file but with JMX, we can 
> monitor the historic values over time using any monitoring tool.  

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