Cassandra error: Too large commit log size

Condition

When the Cassandra commit log takes up too much disk space, connection issues might occur. The following is an example of an error message for this issue: java.lang.IllegalArgumentException: Mutation of 33749684 bytes is too large for the maximum size of 33554432.

• Review your application data model and segment the records into smaller units.

  If your main data set contains 2,000 customer records, segment the data set into four smaller data sets of 500 customer records each.

• As a temporary workaround for the error, in the prconfig.xml file, increase the maximum commit log size in megabytes by specifying the value of the commitlog_segment_size_in_mb property.

  The default maximum commit log size is 32 megabytes.

  For more information, see Changing node settings by modifying the prconfig.xml file.

  <env name=“dnode/yaml/commitlog_segment_size_in_mb” value=“64”/>
  Increase the maximum commit log size only as a temporary workaround. Permanently increased record writes might have a negative impact on database performance, which can affect system performance.

• Troubleshooting Cassandra

  Identify the root cause of degraded performance by completing corresponding monitoring activities. Learn about the most commonly encountered Cassandra issues and how to address them.