Working with Embedded Cassandra Database

The embedded Cassandra service used by the Iotellect server is sufficient for a wide range of use cases, but exceptionally large or specialized systems may require unique database configurations.

Enabling Log Output to External File

In order to output embedded Cassandra logs to an external file:

  1. Open the logging configuration file, which is typically logging.xml in the root directory of your Iotellect installation.

  2. In the <Loggers>...</Loggers> section, remove the following lines:

    <Logger name="org.apache.cassandra.cql3.QueryProcessor" level="off"/>
    <Logger name="org.apache.cassandra.db.Memtable" level="off"/>
    <Logger name="org.apache.cassandra.io.sstable.SSTableDeletingTask" level="off"/>

  3. In the <Loggers>...</Loggers> section, add the following lines:

            <Logger name="org.apache.cassandra" level="info" additivity="false">
                <AppenderRef ref="cassandra"/>
            </Logger>

  4. in the <Appenders>...</Appenders> section, add the following lines:

            <File name="cassandra" fileName="logs/cassandra.log" append="false">
                <ThresholdFilter level="debug"/>
                <PatternLayout pattern="%d{dd.MM.yyyy HH:mm:ss,SSS} %-5p %-25c %m    -    [%t] %C.%M (%F:%L)%n%throwable{full}"/>
            </File>

  5. Optionally, configure log file rotation by adding a Log4J Rolling File Appender to the logging.xml file.

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