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Cassandra directory layout

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Štefan Miklošovič edited this page Apr 20, 2020 · 3 revisions

The anatomy of Cassandra's directory Layout which is mounted under /etc/cassandra inside Cassandra container is discussed here.

cassandra.yaml.d/

Contains YAML fragment files (.yaml) that will be loaded by Cassandra on startup in lexicographical order. These fragments are loaded after the main cassandra.yaml file.

These fragments may override existing settings set in the main cassandra.yaml file, or settings defined in any previous fragments.

Use cases include:

  • Setting default compaction throughput
  • Enabling authentication/authorization
  • Tuning thread pool sizes

cassandra-env.sh.d/

Contains bash shell script fragment files (.sh) that will be sourced (in lexicographical order) during Cassandra startup from the main cassandra.sh startup script.

These scripts may perform a number of operations, including modifying variables such as CASSANDRA_CLASSPATH or JVM_OPTS, though for the latter prefer to use .options fragments (see below) unless shell evaluation/expansion is required.

jvm.options.d/

Contains text fragment files (.options) that will be parsed (in lexicographical order) during Cassandra startup from the main cassandra.sh startup script file to construct the JVM command line parameters.

These fragment files are parsed identically to the main jvm.options file -- lines not staring with a - are ignored. All other lines are assumed to define command line arguments for the JVM.

Use cases include:

  • Tuning JVM CG settings
  • Configuring GC logging
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