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From "Brandon Wulf (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11404) Document metrics mbeans org.apache.cassandra.metrics
Date Thu, 24 Mar 2016 18:06:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15210675#comment-15210675
] 

Brandon Wulf commented on CASSANDRA-11404:
------------------------------------------

It looks like there is some old documentation here: https://wiki.apache.org/cassandra/Metrics

> Document metrics mbeans org.apache.cassandra.metrics
> ----------------------------------------------------
>
>                 Key: CASSANDRA-11404
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11404
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Documentation and Website
>            Reporter: Michael Schurter
>
> Was bemoaning the lack of documentation for Cassandra's extensive metrics in IRC and
[~thobbs] told me to file a ticket: 
> I started stealing comments from {{src/java/org/apache/cassandra/metrics/TableMetrics.java}}:
> ||mbean||description||
> | {{ColumnFamily.$keyspace.$table.MemtableOnHeapSize}} | Total amount of data stored
in the memtable that resides on-heap, including column related overhead and partitions overwritten.
> |
> | {{ColumnFamily.$keyspace.$table.MemtableOffHeapSize}} | Total amount of data stored
in the memtable that resides off-heap, including column related overhead and partitions overwritten.
|
> | {{ColumnFamily.$keyspace.$table.CompressionRatio}} | Current compression ratio for
all SSTables |
> | {{ColumnFamily.$keyspace.$table.Estimated{Partition,Row}SizeHistogram}} | Histogram
of estimated partition size (in bytes). |
> | {{ColumnFamily.$keyspace.$table.ReadLatency}} | Local read metrics. |
> | {{ColumnFamily.$keyspace.$table.WriteLatency}} | Local Write metrics. |
> | {{ColumnFamily.$keyspace.$table.MemstableLiveDataSize}} | Total amount of live data
stored in the memtable, excluding any data structure overhead. |
> | {{ColumnFamily.$keyspace.$table.CoordinatorReadLatency}} | Read request latency from
the perspective of the coordinating node |
> | {{ColumnFamily.$keyspace.$table.CoordinatorScanLatency}} | ??? |



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