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From "Eric Evans (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-75) wire up memtable mbean
Date Mon, 13 Apr 2009 23:12:15 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-75?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Evans updated CASSANDRA-75:
--------------------------------

    Attachment: 0001-add-instrumentation-for-memtable-attributes.patch

The current Memtable class implements an MBean interface, but it is not wired up. Most likely,
this is because it would become defunct after the first flush when the memtable is switched
out for a new one.

The solution is to instrument ColumnFamilyStore and expose the memtable attributes from there.

> wire up memtable mbean
> ----------------------
>
>                 Key: CASSANDRA-75
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-75
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: trunk
>            Reporter: Eric Evans
>            Assignee: Eric Evans
>             Fix For: trunk
>
>         Attachments: 0001-add-instrumentation-for-memtable-attributes.patch, 0002-an-MBean-attribute-for-displaying-a-flush-counter.patch,
0003-jmx-resource-names-to-reflect-the-move-to-apache.patch
>
>
> It would be useful in the tuning of MemtableSizeInMB and MemtableObjectCountInMillions
if the Memtable values for currentSize_ and currentObjectCount_ where exposed via JMX.

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