Metrics

Atom Hopper uses Yammer Metrics to capture metrics.

Metrics captured in Atom Hopper##

Metrics can be accessed through JMX or at

http://localhost:8080/atommetrics

Counters

• entries-created-for-NAMESPACE/FEED

Running count of entries posted for each namespace/feed

Timers

• post-entry

Time it takes to post an entry

• db-post-entry

Time it takes to write an entry in the database

Note: In all the timers below the value of XXX is one of "tiny, small, medium and large".

• get-feed-head-XXXX, get-feed-head-with-cats-XXX

Time it takes to process a get feed head request (with and without search)

• db-get-feed-head-XXXX, db-get-feed-head-with-cats-XXX

Time it takes to retrieve the feed head entries from the database

• get-feed-page-XXXX, get-feed-page-with-cats-XXX

Time it takes to process a get feed page request (with and without search categories)

• db-get-feed-page-XXXX, db-get-feed-page-with-cats-XXX

Time it takes to retrieve the feed page entries from the database (with and without search categories)

• get-last-page-XXXX, get-last-page-with-cats-XXX

Time it takes to process a get last page request (with and without search categories)

• db-get-last-page-XXXX, db-get-last-page-with-cats-XXX

Time it takes to retrieve the last page entries from the database (with and without search categories)

Configuring an Atom Feed to Capture Timer Data

The timers above can be turned on/off in the JDBC Adapter by editing the configuration in the application-context.xml file and setting the enableTimers property to true. Here's an example:

    <bean name="jdbc-feed-publisher" class="org.atomhopper.jdbc.adapter.JdbcFeedPublisher">
        <property name="jdbcTemplate" ref="atomHopperJdbcTemplate" />
        <property name="allowOverrideId">
            <value>true</value>
        </property>
        <property name="allowOverrideDate">
            <value>true</value>
        </property>
        <property name="enableTimers">
            <value>true</value>
        </property>
    </bean>

    <bean name="jdbc-feed-source" class="org.atomhopper.jdbc.adapter.JbdcFeedSource">
        <property name="jdbcTemplate" ref="atomHopperJdbcTemplate" />  
        <property name="enableTimers">
            <value>true</value>
        </property>
    </bean>