Angelo Polo created CASSANDRA-14306:
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Summary: Single config variable to specify logs path
Key: CASSANDRA-14306
URL: https://issues.apache.org/jira/browse/CASSANDRA-14306
Project: Cassandra
Issue Type: Improvement
Components: Configuration
Reporter: Angelo Polo
Attachments: unified_logs_dir.patch
Motivation: All configuration should take place in bin/cassandra.in.sh (for
non-Windows) and the various conf/ files. In particular, bin/cassandra should
not need to be modified upon installation. In many installs, $CASSANDRA_HOME is
not a writable location, the yaml setting 'data_file_directories' is being set
to a non-default location, etc. It would be good to have a single variable in
an explicit conf file to specify where logs should be written.
For non-Windows installs, there are currently two places where the log
directory is set: in conf/cassandra-env.sh and in bin/cassandra. The defaults
for these are both $CASSANDRA_HOME/logs. These can be unified to a single
variable CASSANDRA_LOGS that is set in conf/cassandra-env.sh, with the
intention that it would be modified once there (if not set in the environment)
by a user running a custom installation. Then include a check in bin/cassandra
that CASSANDRA_LOGS is set in case conf/cassandra-env.sh doesn't get sourced on
startup, and provide a default value if not. For the scenario that a user would
prefer different paths for the logback logs and the GC logs, they can still go
into bin/cassandra to set the second path, just as they would do currently. See
"unified_logs_dir.patch" for a proposed patch.
No change seems necessary for the Windows scripts. The two uses of
$CASSANDRA_HOME/logs are in the same script conf/cassandra-env.ps1 within
scrolling distance of each other (lines 278-301). They haven't been combined I
suppose because of the different path separators in the two usages.
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